Teac UD-505 - USB DAC / Headphone Amplifier Manual

Included accessories

Check to be sure the box contains all the included items shown below.
Please contact the store where you purchased this unit if any of these items are missing or have been damaged during transportation.
Power cord × 1
RCA conversion (RCA to mini plug) cable × 1
Remote control (RC-1330) × 1
Batteries for remote control (AAA) × 2
Pads × 3
Owner's manual (this document, including warranty) × 1

Before use

Placement precautions

• Do not install this unit in a location that could become hot. This includes places that are exposed to direct sunlight or near a radiator, heater, stove or other heating equipment. Moreover, do not place it on top of an amplifier or other equipment that generates heat. Doing so could cause discoloration, deformation or malfunction.
• Avoid locations that are extremely cold or exposed to excessive humidity or dust.
• When installing this unit, leave a little space (at least 3 cm or 1") between it and walls and other devices in order to allow good heat dissipation. If you put it in a rack, for example, leave at least 5 cm (2") open above it and at least 10 cm (4") open behind it. Failure to provide these gaps could cause heat to build up inside and result in fire.
• The voltage supplied to the unit should match the voltage printed on the rear panel. If you are in any doubt regarding this matter, consult an electrician.
• Do not move the unit during use.
• Do not open the body of the unit because this could result in damage to the circuitry or cause electric shock. If a foreign object should enter the unit, contact your dealer.
• When removing the power plug from the wall outlet, always pull directly on the plug; never yank on the cord.

Note about pinpoint feet

High-precision metal pinpoint feet are attached firmly to the bottom plate of this unit.
The stands for these feet are loose, but when the unit is placed in position, it is supported by these pinpoint feet, which will effectively disperse vibrations.

• Apply the included pads to the bottoms of the foot-stands to avoid scratching the surface where the unit is placed.

Maintenance

Wipe dirt from the top cover and other panel surfaces using a soft cloth that has been slightly dampened with a diluted neutral cleanser.
Do not wipe with chemical cleaning cloths, thinner or other chemical agents. Doing so could damage the surface.

For your safety, disconnect the power cord from the outlet before cleaning.

Using the TEAC Global Site

You can download updates for this unit from the TEAC Global Site:
http://teac-global.com/

1. Open the TEAC Global Site.
2. In the TEAC Downloads section, click the desired language to open the Downloads website page for that language.
   NOTE
   If the desired language does not appear, click Other Languages.
3. Click the "Search by Model Name" section to open the Downloads page for that product. (Users in Europe should click the product name in the "Products" section instead.)
4. Select and download the updates that are needed.

Product registration

Customers in the USA, please visit the following TEAC website to register your TEAC product online.
http://audio.teac.com/support/registration/

Connections

Rear panel

1. Analog audio input (LINE IN) connectors
   Use these to input stereo analog audio. Connect the audio output connectors of a cassette deck, CD player or other audio output equipment to these.
   Use commercially-available RCA audio cables for connections.
   Connect this unit's R input connector to the R output connector of the audio output device, and this unit's L input connector to the L output connector of the other device.
   
2. RCA COAXIAL digital audio input connector
   Use this to input digital audio. Connect the coaxial digital audio output connector of an audio device to it.
   Use a commercially-available RCA coaxial digital cable for connection.
3. OPTICAL digital audio input connector
   Use this to input digital audio. Connect the optical digital audio output connector of an audio device to it.
   Use a commercially-available optical digital cable with a square connector (TOSLINK) for connection.
4. CLOCK SYNC input (10MHz IN) connector
   Use this to input a synchronization signal (clock sync).
   To input a 10MHz oscillator signal, connect the oscillator output here (see "Specifications").
   Use a commercially available BNC coaxial cable for connection.
   • Clock sync is possible when the input source is USB.
5. Analog audio output (LINE OUT) connectors
   These output 2 channels of analog audio. Connect these XLR or RCA connectors to a stereo amplifier or powered speakers.
   Use commercially available cables for connections.
   XLR: balanced XLR cables
   RCA: RCA audio cables
   Connect this unit's R connector to the R connector of the amplifier and its L connector to the L connector of the amplifier.
   • See "Line output" section for analog output settings.
6. USB port
   Use this to input digital audio from a computer. Connect it to a computer's USB port.
   Use a commercially-available USB2.0 cable (A-B type) for this connection.

ATTENTION
Before connecting a computer that is running a Windows OS, you must install the dedicated driver on the computer (see "Installing the driver").
Proper connection is not possible with a computer that does not have this driver installed.

7. Maintenance port
   This is used for maintenance. Do not connect anything to this port unless instructed to do so by our service department.
8. Power inlet (~IN)
   Connect the supplied power cord here. After all other connections are complete, connect the power cord's plug to a wall outlet.

Do not use any power cord other than the one included with this unit. Use of other power cords could result in fire or electric shock.

Unplug the cord from the outlet when not using the unit for a long time.

Complete all other connections before turning the unit on.

• Carefully read the manuals of the devices that you are connecting and follow their instructions when making connections.
• Do not bundle connecting cables with power cords. Doing so could cause noise.
• Connect all plugs completely.

Front panel

Digital audio input (OPT/COAX IN)
This input connector can be used for both optical (OPT) and coaxial (COAX) connections.

Optical connection

Use a commercially-available optical cable with a mini plug.
To enable this input, turn the INPUT knob to select OPTICAL2.

Coaxial connection

Use the included RCA conversion cable and a commerciallyavailable RCA coaxial digital cable.
To enable this input, turn the INPUT knob to select COAXIAL2.

Names and functions of parts

Remote control

When the main unit and the remote control both have buttons with the same functions, this manual explains how to use one of the buttons. The other corresponding button can be used in the same manner.

1. STANDBY/ON button
   Press to put the unit into standby mode or turn it on.
2. Input selection buttons
   Use to select the playback source.
   • The NET button has no function.
3. INFO button
   Press to show upconversion information (see "Display").
4. UPCONVERT button
   Press to change the upconversion setting.
5. FILTER button
   Press to change the filter setting.
   This changes the filter according to the input (PCM or DSD).
6. MUTE button
   Press to minimize the volume.
7. DIMMER button
   Press to adjust the brightness of the main unit's display.
8. HEADPHONE button
   Press to turn headphone output on and off.
   When headphone output is turned off, sound is output from the analog audio output (LINE OUT) connectors.
9. DISPLAY button
10. MENU button
    Press to enter setting mode (see "Settings"). Press when in setting mode to return to the previous screen.
11. Up/down ( ) buttons
    Use to select setting items.
12. ENTER button
    Press to confirm the selected item.
13. VOLUME (+/−) buttons
    Use to adjust the volume.

Main unit

1. POWER switch
   Use to turn the unit on and off.
   • If the display is dark even though the POWER switch is set to ON, the cause is usually one of the following.
     • The power is on, but DIMMER (display brightness) is set to OFF (see "Settings").
     • The automatic power saving function has activated, putting the unit into standby.
     • The power cord is disconnected.

To turn the unit on, press the STANDBY/ON button on the remote control, or set the POWER switch to OFF once and then back to ON.

2. CLOCK indicator
   This shows the clock synchronization status.

Lit:	The unit is synchronized with the clock from the CLOCK SYNC input (10MHz IN) connector.
Blinking:	No clock is being input or the unit is not being synchronized.
Unlit:	No clock sync is occurring.

• Clock sync is possible when the input source is USB.
• See "Settings > Clock sync" for clock sync settings.

3. Digital audio input (OPT/COAX IN) connector
   Use to input digital audio (see "Connections > Front panel").
   Optical connection: Use an optical cable with a mini plug.
   Coaxial connection: Use the included RCA conversion cable.
4. INPUT knob
   Use to select the input source.
   Use to change setting values when a menu item is shown.
   Press to use as an ENTER button.
   Turn when the menu is open to change the item shown or the setting value.
5. MENU button
   Press to enter setting mode (see "Settings").
   Press when in setting mode to return to the previous screen.
6. Remote control signal receiver
   This receives signals from the remote control. When operating the remote control, point it at the remote control signal receiver.
7. PHONES jacks
   Connect headphones with standard 6.3mm (1/4") stereo or 4.4mm plugs here (see "Connecting headphones").
   • When headphones are connected to this unit, headphone output will be turned on and audio will stop being output from the analog audio output (LINE OUT) connectors on the rear panel.
8. Display
   This display shows information about the audio playing back and menu screens.
9. VOLUME knob
   Use to adjust the volume. Turn right to increase and left to decrease the volume.
   • To enable adjustment of this unit's analog audio output volume, set LINE OUT LEVEL to VARIABLE ("Line output level"). This will enable adjustment of the analog output level using this unit's VOLUME knob.
   • Volume settings are retained separately for analog audio output and headphone output.

Using the remote control

Precautions for use

Misuse of batteries could cause them to rupture or leak, which might result in fire, injury or the staining of nearby materials. Please carefully read and observe the precautions concerning batteries.

• When using the remote control, point it toward the remote control signal receiver on the main unit from a distance of 5 m (16 ft) or less. Do not place obstructions between the main unit and the remote control.
• The remote control might not work if the remote control signal receiver on the unit is exposed to direct sunlight or bright light. If this occurs, try moving the unit.
• Beware that use of this remote control could cause the unintentional operation of other devices that can be controlled by infrared rays

Installing batteries

Remove the cover from the back of the remote control and insert two AAA batteries with their oriented as shown in the case. Replace the cover.

When to replace batteries

If the distance required between the remote and the main unit decreases or if the unit stops responding to the remote buttons, replace both batteries with new ones.
Dispose of the used batteries according to the instructions on them or requirements set by your local municipality.

Connecting headphones

While wearing headphones, do not connect or disconnect them or turn the unit on or off.
Doing so could result in a sudden loud noise that could harm your hearing.

Before putting headphones on, always set the volume to minimum (display should show "0" when set to "STEP (0-100)" or "−∞ dB" when set to "dB") (see "Basic operation").

Ordinary headphones

When using unbalanced headphones, set HEADPHONE 6.3mm to UNBALANCED (see "Settings").

Connect the headphones to either or both left and right jacks.

• When connecting headphones to both jacks, use headphones with the same impedance and efficiency.
• Be aware that if you use two pairs of headphones with different efficiencies at the same time, you will not be able to adjust their volumes separately

Balanced headphones

When using balanced headphones, set the appropriate headphones setting to BALANCED or ACTIVE GROUND (see "Settings").

Standard 6.3mm stereo plugs

Connect the L headphones plug to the left jack and the R headphones plug to the right jack.

• The headphones plugs should be standard 6.3 mm (1/4") plugs.

Wiring illustration
The above wirings support headphones that use balanced drive.

ATTENTION

• Connecting a mono plug will short one side.
• When using twin-core shielded wires, do not connect the shields to the headphones.

4.4mm 5-pole stereo plug

Headphones that conform to the JEITA RC-8141C standard can be connected.

Wiring illustration

Upconversion

You can use the upconversion function with digital audio input (OPT, COAX) and USB input (see "Settings > Upconversion").
The relationships between input sampling frequencies and sampling frequencies after upconversion are as follows.

These values are not converted.

• The maximum upconversion is 8× Fs.
• Upconversion is not possible when the input is DSD.

Display

When on

After the above messages appear, the input source will be shown on the display.

Playback source information

The playback source information display will appear after turning the unit on as well as after about 7 seconds pass without operation when a setting screen is open.
The input signal format or volume is shown to the right of the playback source. Press the DISPLAY button on the remote control to change what is shown.

Display example

Playback source name

This shows the name of the selected source.
The names on the display correspond to the selected connectors as follows.
The names in parentheses appear when switching.

USB (USB)
USB port on the rear panel

COAX1 (COAXIAL 1)
RCA COAXIAL digital audio input connector on the rear panel

COAX2 (COAXIAL 2)
Coaxial connection with the digital audio input (OPT/COAX IN) on the front panel

OPT1 (OPTICAL 1)
OPTICAL digital audio input connector on the rear panel

OPT2 (OPTICAL 2)
Optical connection with the digital audio input (OPT/COAX IN) on the front panel

Bluetooth (Bluetooth)
Bluetooth device

LINE (LINE IN)
Analog audio input (LINE IN) connectors on the rear panel

Input signal status

This shows the input source signal status.

Check
The connection is being checked.

PCM 32kHz
PCM 44.1kHz
PCM 48kHz
PCM 88.2kHz
PCM 96kHz
PCM 128kHz
PCM 176.4kHz
PCM 192kHz
PCM 256kHz
PCM 352.8kHz
PCM 384kHz
PCM 705.6kHz
PCM 768kHz
DSD 2.8MHz
DSD 5.6MHz
DSD 11.2MHz
DSD 22.5MHz
These show the input signal type and sampling frequency.

Upconversion information displayed

Press the INFO button during playback to show input signal upconversion information.

• The input signal and playback signal displays will be the same when the upconversion setting is "OFF".

Example when the playback source is USB, COAX1, COAX2, OPT1 or OPT2

Example when the playback source is Bluetooth

Volume display

Two types of volume can be shown: STEP and dB.
This is set by the VOLUME TYPE setting (see "Settings").

The volume setting shown will be enlarged when you turn this unit's VOLUME knob.

• The headphone volume is shown when headphones are connected.

VOLUME TYPE set to "STEP (0–100)"
Display example
The maximum volume level is 100 and the minimum level is 0. Before connecting headphones, set the VOLUME knob to its minimum value (0). Failure to do so might cause sudden loud noises, which could harm your hearing or result in other trouble.

VOLUME TYPE set to "dB"
Display example
The maximum volume level is 0 and the minimum level is −∞ (negative infinity). Before connecting headphones, set the VOLUME knob to its minimum value (−∞). Failure to do so might cause sudden loud noises, which could harm your hearing or result in other trouble.

The set output level is shown when LINE OUT LEVEL is set to "FIXED 0dB" or "FIXED +6dB".

Example when VOLUME TYPE set to "dB"

• If VOLUME TYPE is set to "STEP (0–100)", "VOL. 86" will be shown when set to "FIXED 0dB" and "VOL. 90" will be shown when set to "FIXED +6dB".

When headphones are not connected and LINE OUT LEVEL is set to "OFF", "VOL. 0" or "−∞ dB" will be shown.

Example when VOLUME TYPE set to "dB"

When headphones are not connected and LINE OUT LEVEL is set to FIXED or OFF
Turning the VOLUME knob will cause the following to be displayed.

Basic operation

1. Shift the POWER switch to its ON position to turn the unit on.
   
   • If a stereo amplifier is connected to this unit, always turn its power ON very last.
2. Turn the INPUT knob to select the input source.
   

The selected source appears on the display.

• You can also use the input selection buttons on the remote control.
• If the input signal is not a digital audio signal or is an audio signal format that is not supported by this unit, such as Dolby Digital or DTS, no audio will be output. Set the digital output of the connected device to PCM audio output.
• To play back audio files when this unit is set to USB, you must first install a dedicated driver on the computer before connecting them (see "Installing the driver").
• DSD data can only be played back using USB or DoP format digital input.

3. Operate the playback device.
   Refer to the operation manual of that device.
4. Adjust the volume.
   When using the line outputs
   When LINE OUT LEVEL is set to VARIABLE, turn this unit's VOLUME knob to adjust the volume.
   When LINE OUT LEVEL is set to any other setting, the volume cannot be adjusted from this unit. Use the stereo amplifier or other device connected to this unit to adjust the volume.
   When headphones are connected to this unit
   Turn this unit's VOLUME knob to adjust the volume.
   • When this unit's VOLUME knob is enabled, the volume setting will be shown.

Bluetooth wireless technology

Bluetooth notes

When using this unit with a mobile phone or other Bluetooth devices, they should be no more than about 10 m (33 ft) apart. Depending on the circumstances of use, however, the effective transmission distance might be shorter.
Wireless communication with every device that supports Bluetooth wireless technology is not guaranteed.
To determine the compatibility between this unit and another device that supports Bluetooth wireless technology, refer to that device's operation manual or contact the shop where you purchased it.

Profiles

This unit supports the following Bluetooth profiles.

• A2DP (Advanced Audio Distribution Profile)
• AVRCP (Audio/Video Remote Control Profile)

In order to transfer audio using Bluetooth wireless transmission, the Bluetooth device must support A2DP.
In order to control playback on the Bluetooth device, it must support AVRCP.
Even if a Bluetooth device supports the same profiles, though, its functions might differ according to its specifications.

Codecs

This unit supports the following codecs. It will automatically select one of them during audio transfer.

1. SBC
2. AAC
3. Qualcomm aptX
4. Qualcomm aptX HD
5. LDAC

The unit will select the appropriate codec to use according to the codec compatibility of the other Bluetooth device and communication conditions.

LDAC is an audio coding technology developed by Sony that enables the transmission of High-Resolution (Hi-Res) Audio content, even over a Bluetooth connection.
Unlike other Bluetooth compatible coding technologies such as SBC, it operates without any down-conversion of the Hi-Res Audio content*, and allows approximately three times more data** than those other technologies to be transmitted over a Bluetooth wireless network with unprecedented sound quality, by means of efficient coding and optimized packetization.

* excluding DSD format contents
** in comparison with SBC (Subband Coding) when the bitrate of 990 kbps (96/48 kHz) or 909 kbps (88.2/44.1 kHz) is selected

NOTE

• You cannot select the codec to be used by pressing a button, for example.
• Due to characteristics of Bluetooth wireless technology, playback from a Bluetooth device will be slightly delayed compared to playback from this unit.

Content protection

This unit supports SCMS-T as a form of content protection when transmitting audio, so it can play protected audio.

Transmission security

This unit supports security functions during Bluetooth wireless transmission in accordance with the Bluetooth standard specifications, but it does not guarantee the privacy of such transmissions. TEAC CORPORATION will bear no responsibility should an information leak occur during Bluetooth wireless transmission.

Pairing with another Bluetooth device

Pairing this unit with another Bluetooth device is necessary the first time it is used and when connecting to a different Bluetooth device for the first time.

1. Turn the INPUT knob to select Bluetooth.
   
2. Enable Bluetooth transmission on the other Bluetooth device.
3. Press and hold the INPUT knob to enter pairing mode.
   
   • "PAIRING..." blinks when pairing.
4. On the other Bluetooth device, select "UD-505" (this unit).
   After this unit enters pairing mode, pair with it from the other Bluetooth device.
   For details, refer to the operation manual of that Bluetooth device.
   After connection, the display will show the name of the connected device, followed by the input source.
   
   Display example

Playback from a Bluetooth device

• Pair this unit the first time you use it and when you want to connect it with a different Bluetooth device for the first time (see above).
• When pairing or connecting with another Bluetooth device, they should be within a few meters of each other. If they are too far apart, pairing and connection afterwards might become impossible.

1. Enable Bluetooth transmission on the other Bluetooth device.
2. Turn the INPUT knob to select Bluetooth.
   This sets the source to Bluetooth.
   
   Display example
   • You can also use the Bluetooth button on the remote control.

This unit will search for paired devices and automatically connect to one if found.

ATTENTION
Depending on the source device, you might also need to conduct connection operations on it.
If you are unable to connect it successfully, refer to the operation manual of the source device.

Changing the connected device

1. Press the INPUT knob to show DEVICE SELECT.
   The bottom line of the display shows the name of the last connected device.
   
   Display example
2. Turn the INPUT knob to show already paired Bluetooth devices.
   • The unit can remember a maximum of eight device pairings.
   • If no paired device is available, the display will appear as follows.
     
   • Press and hold the ENTER button to enter pairing mode (see above).
   • The first 16 characters of the device name are shown.
   • If characters other than English letters and numbers are included in the device name, it will not be shown properly.
3. Press the INPUT knob to connect.
   After connection, the display will show the input source.

ATTENTION
Regardless of the connection status of this unit and the other Bluetooth device, if the input source is not shown, restart both this unit and the other device and then connect them again.

NOTE
Depending on the source device, you might also need to conduct connection operations on it.
If you are unable to connect it successfully, refer to the operation manual of the source device.

4. Start playback on the other Bluetooth device.
   • Confirm that the volume is turned up on the other Bluetooth device. If you do not turn up the volume on the playback device, no sound might be output from this unit.

NOTE
Press and hold the MENU button to clear a paired device.

Settings

1. Press the MENU button to open the menu screen.
   
2. Turn the INPUT knob to show the item that you want to set.
   
   • You can also use the up and down (k, j) buttons on the remote control.

The menu items appear in the following order.

3. Press the INPUT knob.
   
   • You can also press the ENTER button on the remote control.
   • The currently set value is shown on the display.
4. Turn the INPUT knob to change the setting value.
   • You can also use the up and down (k, j) buttons on the remote control.
   • Press the MENU button to return to setting item selection.
5. Press the INPUT knob.
   • You can also press the ENTER button on the remote control.
6. When you are done changing settings, press the MENU button to show the input source status again.
   
   • If you do not do anything for about 7 seconds, the display will return to showing the input source status.

Upconversion

Use to activate the upconversion circuit when receiving PCM signals.

• See the section "Upconversion" for the relationships between input sampling frequencies and sampling frequencies after upconversion.
  

OFF
The original input signal is sent directly to the D/A converter without upconversion.

2× Fs
If the input audio signal is less than 2× a standard sampling frequency, it is upconverted 2× and then sent to the D/A converter.

4× Fs
If the input audio signal is less than 4× a standard sampling frequency, it is upconverted 4× and then sent to the D/A converter.

8× Fs
If the input audio signal is less than 8× a standard sampling frequency, it is upconverted 8× and then sent to the D/A converter.

DSD 256
DSD 512
The input source is converted to DSD digital format, and then sent to the D/A converter.

PCM digital filter

This sets the type of digital filter used when converting PCM signals from digital to analog.

Sharp roll off
An FIR filter with a steep roll-off is used to sharply cut signals outside the audio band.

Slow roll off
An FIR filter with a slow roll-off is used to gently cut signals outside the audio band.

Short Delay Sharp
A short delay filter with a steep roll-off is used to sharply cut signals outside the audio band.

Short Delay Slow
A short delay filter with a slow roll-off is used to gently cut signals outside the audio band.

Low dispersion
A short delay filter with low dispersion that improves lag characteristics in high frequencies is used.

OFF
No digital filter is used.

• When receiving signals at 352.8 kHz, 384 kHz, 705.6 kHz or 768 kHz, the digital filter will be disabled during playback regardless of this setting.

Note about the digital filter during PCM playback
FIR-type digital filters
This type of filter has an established reputation for sound quality and features tonal quality with both dense, rich sound reverberations and crisp sound transients.
Short Delay-type digital filters
This type of filter has no pre-echo in the impulse response and features natural sound attack and reverberation for a tonal quality that is close to the original.

DSD digital filter

This sets the type of digital filter used when converting DSD signals from digital to analog.

NARROW
The cutoff frequency will be set according to the DSD signal as follows.

DSD signal	Cutoff frequency
2.8 MHz	39 kHz
5.6 MHz	78 kHz
11.2 MHz	156 kHz
22.5 MHz	312 kHz

WIDE
The cutoff frequency will be set according to the DSD signal as follows.

DSD signal	Cutoff frequency
2.8 MHz	76 kHz
5.6 MHz	152 kHz
11.2 MHz	304 kHz
22.5 MHz	608 kHz

Clock sync

• Clock sync is possible when the input source is USB.
  

OFF
No clock sync is used.

ON
This unit's master clock will be synchronized to the 10MHz clock input through the CLCOK SYNC input (10MHz IN) connector.

Line output

Use to select the connectors that output analog audio.

• Output through both the RCA connectors and the XLR connectors at the same time is not possible.
  

RCA
Output through the RCA connectors.

XLR (HOT 2)
Output through the XLR connectors with 2: HOT polarity.

XLR (HOT 3)
Output through the XLR connectors with 3: HOT polarity.

Line output level

Use to select audio level output from the analog audio output (LINE OUT) connectors.

FIXED 0dB
A maximum of 2 Vrms is output. Select this if you want to adjust the volume using an amplifier.

• No sound will be output if headphones are connected.

FIXED +6dB
A maximum of 4 Vrms is output. Select this if you want to adjust the volume using an amplifier.

• No sound will be output if headphones are connected.
• If the sound distorts, set this to FIXED 0dB.

VARIABLE
This will enable adjustment of the analog output level using the VOLUME knob. Select this if you want to adjust the volume using this unit.

• No sound will be output if headphones are connected.

OFF
No sound is ever output.

6.3 mm Headphones settings

Make settings suitable for the headphones being connected (see "Connecting headphones").

UNBALANCED
Unbalanced headphones

BALANCED
Balanced headphones
Balanced headphones are operated with differential drive.
The negative and positive connectors operate with opposite polarities.

ACTIVE GROUND
Balanced headphones
The amp drives so that the negative connector of balanced headphones is 0 V.
To the headphones, the characteristics of the outputs become equivalent.

4.4 mm Headphones settings

Make settings suitable for the headphones being connected (see "Connecting headphones").

BALANCED
Balanced headphones
Balanced headphones are operated with differential drive.
The negative and positive connectors operate with opposite polarities.

ACTIVE GROUND
Balanced headphones
The amp drives so that the negative connector of balanced headphones is 0 V.
To the headphones, the characteristics of the outputs become equivalent.

Display brightness

DARK
Dark

SLIGHTLY BRIGHT
Lit dimly

BRIGHT
Lit brightly

AUTO OFF
Unlit automatically

• The display stays unlit even when the unit is on.

Volume display

This sets how the volume is shown.

STEP (0-100)
This shows the volume in steps from 0 (minimum) to 100 (maximum).

dB
This shows the volume in decibels (dB).

Screen indication

Select the information shown to the right of the playback source.

volume
The volume will be shown.

sampling freq.
Information about the playback source will be shown.

Automatic power saving function

This unit has an automatic power saving function.

• The automatic power saving function is on when the unit is shipped new from the factory.
  

OFF
The automatic power saving function is disabled.

ON
The unit will automatically enter standby mode if no audio is output and no operation is conducted for about 30 minutes.

Information display

This shows the version of the firmware used by the unit.

SYSTEM
The firmware version of the microcomputer

USB
The firmware version of the USB module

Bluetooth
The firmware version of the Bluetooth module

Playing back music on a computer

Installing the driver

This unit can be connected with computers running the following operating systems. Operation with other operating systems is not guaranteed (as of November, 2017).

When using Mac
The driver works with the following versions.
OS X Lion (10.7)
OS X Mountain Lion (10.8)
OS X Mavericks (10.9)
OS X Yosemite (10.10)
OS X El Capitan (10.11)
macOS Sierra (10.12)
macOS High Sierra (10.13)

This unit will run with the standard OS driver, so there is no need to install a special driver.
A dedicated driver must be installed on the computer, however, to use Bulk Pet.

When using Windows
The driver works with the following versions.
Windows 7 (32/64-bit)
Windows 8 (32/64-bit)
Windows 8.1 (32/64-bit)
Windows 10 (32/64-bit)

Installing the driver on the computer
In order to play audio files stored on a computer through this unit, you must install a dedicated driver on that computer beforehand. Download the dedicated driver from the TEAC Global Site.

TEAC Global Site
http://www.teac-global.com/

ATTENTION
Install the dedicated driver before connecting the unit with the computer by USB.
If you connect this unit with a computer before installing the driver, it will not work properly.

• For instructions about driver installation procedures, access the Downloads page from the TEAC Global site (http://teac-global.com/).
• Depending on the combination of hardware and software, proper operation might not be possible even with the above operating systems.

About transmission mode

This unit can transfer data using Isochronous or Bulk Pet mode.
The sampling frequencies that can be transmitted are 44.1, 48, 88.2, 96, 176.4, 192, 352.8, 384, 705.6 and 768 kHz.
When properly connected, you will be able to select "TEAC USB AUDIO DEVICE" as an audio output from the computer OS.

• During data transfer, the audio data sent from the computer will be processed using this unit's clock, enabling the amount of jitter that occurs during data transmission to be reduced.

Downloading playback application TEAC HR Audio Player

You can download Mac and Windows versions of our free TEAC HR Audio Player application that supports playback of DSD files from the TEAC Global Site (http://teac-global.com/).

TEAC HR Audio Player setting note
To play 22.5MHz DSD recordings with TEAC HR Audio Player, open the Configure window and set the "Decode mode" to "DSD Native. "
To play formats other than 22.5MHz DSD, you can set this to either "DSD over PCM" or "DSD Native" as you like.
For details, see "Selecting DSD decoding mode" in the TEAC HR Audio Player Owner's Manual.

Playing back audio files from a computer

1. Connect this unit to the computer using a USB cable.
   
   • Use a cable with a connector that matches that of this unit.
2. Turn the computer on.
   • Confirm that the operating system has started properly.
3. Shift the POWER switch to its ON position to turn the unit on.
   
4. Turn the INPUT knob to select USB.
   
5. Start playback of an audio file on the computer.
   By maximizing the output volume from the computer and adjusting the volume output from the stereo amplifier, better sound quality can be achieved.
   Minimize the stereo amplifier volume before beginning playback. Then, gradually increase it.
   When using headphones connected to this unit, turn the VOLUME knob counterclockwise to minimize the volume before putting them on. Then, gradually increase it.

• The computer and this unit cannot control each other.
• Do not do any of the following when playing back an audio file via USB. Doing so could cause the computer to malfunction. Always quit the audio playback software before doing any of the following.
  • Unplugging the USB cable
  • Turning the unit off or putting it into standby mode
  • Changing the current input selection
• When playing back an audio file via USB, computer operation sounds will also be output. If you do not want these sounds to be output, make appropriate settings on the computer to turn them off.
• If you connect this unit with the computer or change its input to USB after starting the audio playback software, audio files might not play back correctly. If this should occur, restart the audio playback software or restart the computer.

Troubleshooting

If you experience a problem with the unit, please take a moment to review the following information before requesting service. If it still does not operate correctly, contact the retailer where you purchased the unit.

General

The unit does not turn on

• Check that the power cord is completely plugged into the power outlet. If the outlet is switched, confirm that the switch is in the ON position.
• Connect a different electrical device to the outlet to confirm that it is supplying power.
• If the automatic power saving function has caused the unit to enter standby, press the remote control STANDBY/ON button to turn the unit on again.

No sound is output

• If a stereo amplifier is connected to this unit, adjust its volume.
• If you are using headphones connected to this unit, use the VOLUME knob to adjust the volume.
• Use the INPUT knob to select the input that is connected to the source that you want to hear.
• Reconfirm the connections with other equipment.

There is a humming noise

• If a connecting cable is near a power cord, fluorescent light or similar cause of interference, increase the distance between them as much as possible.

There is no sound from one side of the headphones.

• Confirm that the headphones plug is inserted completely.

The headphone output is not stereo

• Confirm that HEADPHONE 6.3mm is UNBALANCED.

Clock sync

The CLOCK indicator does not stop blinking

• Set clock synchronization to OFF when not using it.
• Synchronization with the clock signal being input might not be possible. Check the connections of the clock sync connectors and the settings of the connected device.

Connections with a computer

Computer does not recognize this unit

• See "Installing the driver" for information about supported operating systems. Operation with unsupported operating systems is not guaranteed.

Noise occurs

• Starting other applications during playback of an audio file may interrupt playback or cause noise. Do not start other applications during playback.
• When the unit is connected to a computer via a USB hub, for example, noise might be heard. If this occurs, connect the unit directly to the computer.

Audio files cannot be played back

• Connect this unit to the computer, and set this unit's input to USB before launching audio playback software.
  If you connect this unit to the computer or set its input to USB after launching audio playback software, audio files might not play back properly.

Bluetooth function

Cannot show device name

• This unit does not support the display of symbols or doublebyte characters, including Japanese and Chinese. Use only English letters and numbers for the names of Bluetooth devices connected to this unit.

Cannot change connected Bluetooth device

• This unit cannot have Bluetooth connections to multiple Bluetooth devices at the same time.
  To change the device connected with this unit by Bluetooth, end the connection with the currently connected Bluetooth device before connecting to another Bluetooth device.

Since this unit uses a microcontroller, external noise and other interference can cause the unit to malfunction. If this occurs, unplug the power cord, wait for a while, and then turn the unit on again and restart operations.

Restoring default settings

1. While pressing and holding the MENU button, set the POWER switch to ON.
   
2. Release the MENU button when the FACTORY RESET menu appears.
   
3. Press the INPUT knob.
   Resetting begins when "Please wait!" appears.
   

The playback source display screen will appear after resetting completes.

Display example

ATTENTION

• Do not put the unit in standby until the playback source
• This operation will restore all settings to their default values.

• The factory default settings are the setting values shown in the screen images used in the explanations in this manual.

Specifications

Analog audio outputs
Connectors
XLR connectors		1 pair (L/R)
RCA connectors		1 pair (L/R)
Output impedance		XLR: 188 Ω RCA: 150 Ω
Maximum output level (1 kHz/full-scale, into 10 kΩ)
FIXED 0dB		XLR/RCA: 2.0 Vrms
FIXED +6dB		XLR/RCA: 4.0 Vrms
VARIABLE		XLR: 12 Vrms RCA: 6 Vrms
Frequency response*		5 Hz – 80 kHz (+1 dB/−5 dB)
S/N ratio*		110 dB (A-Weight, 1 kHz)
Distortion*		0.0015% (1 kHz, LPF: 20 Hz – 20 kHz)
*Measurement conditions Input signal: 192kH 24-bit PCM Measurement output: RCA PCM digital filter: off
Headphones output
Connectors		Standard 6.3mm (1/4") stereo jacks × 2 4.4mm 5-pole stereo jack × 1
Maximum effective output
UNBALANCED		500 mW + 500 mW (one pair into 32 Ω) 350 mW + 350 mW (two pairs into 32 Ω)
BALANCED		700 mW + 700 mW (into 32 Ω)
Compatible impedance range		16–600 Ω
Analog audio inputs
RCA connectors		1 pair (L/R)
Input impedance		25 kΩ
Input sensitivity		130 mV
Digital audio inputs
COAXIAL digital		RCA connector × 1 3.5mm mini jack** × 1 (3.5mm mini plug connection also possible using RCA-mini plug adapter cable) (0.5 Vp-p, 75 Ω)
OPTICAL digital		Square connector × 1 Round connector** × 1 (−24.0 to −14.5dBm peak)
USB		USB Type B port × 1 (USB 2.0 compliant)
PCM data sampling frequency
COAXIAL digital		32 kHz, 44.1 kHz, 48 kHz, 88.2 kHz, 96 kHz, 176.4 kHz, 192 kHz
OPTICAL digital		32 kHz, 44.1 kHz, 48 kHz, 88.2 kHz, 96 kHz, 176.4 kHz, 192 kHz
USB		44.1 kHz, 48 kHz, 88.2 kHz, 96 kHz, 176.4 kHz, 192 kHz, 352.8 kHz, 384 kHz, 705.6 kHz, 768 kHz
Quantization bit depth
COAXIAL digital/OPTICAL digital		16/24-bit
USB		16/24/32-bit
DSD data sampling frequency
COAXIAL digital/OPTICAL digital		2.8 MHz (supported using 176.4kHz/24-bit DoP transmission)
USB		2.8 MHz, 5.6 MHz, 11.2 MHz, 22.5 MHz
**This input connector can be used for both optical and coaxial connections.
Bluetooth function
Bluetooth version		4.0
Output class		Class 2
(transmission distance without obstructions***)		10 m
Supported profiles		A2DP, AVRCP
Supported A2DP codecs		SBC, AAC, Qualcomm aptX, Qualcomm aptX HD, LDAC
Supported A2DP content protection		SCMS-T
Maximum number of stored pairings		8
*** The transmission distance is approximate. The transmission distance could vary depending on the surrounding environment and electromagnetic waves.
Clock sync input
Connector		BNC
Input sampling frequency		10 MHz
Input impedance		50 Ω
Input level		Rectangle wave: equivalent to TTL levels Sine wave: 0.5 to 1.0 Vrms
General
Power supply
Model for Europe		AC 220–240 V, 50/60 Hz
Model for U.S.A./Canada		AC 120 V, 60 Hz
Power consumption		18 W
Standby power		0.4 W (in standby mode)
External dimensions (W × H × D including protrusions)		290 mm × 84.5 mm × 248.7 mm (11 1/2" × 3 3/8" × 9 7/8")
Weight		4.2 kg (9 3/8 lb)
Operating temperature		+5°C to +35°C
Operating humidity range		5% to 85% (no condensation)
Storage temperature range		−20°C to +55°C

Included accessories
Power cord × 1
RCA conversion (RCA to mini plug) cable × 1
Remote control (RC-1330) × 1
Batteries for remote control (AAA) × 2
Pads × 3
Owner's manual (this document, including warranty) × 1

• Design and specifications are subject to change without notice.
• Weight and dimensions are approximate.
• Illustrations in this manual might differ slightly from production models.

IMPORTANT SAFETY INSTRUCTIONS

TO REDUCE THE RISK OF ELECTRIC SHOCK, DO NOT REMOVE COVER (OR BACK). NO USERSERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.

The lightning flash with arrowhead symbol, within an equilateral triangle, is intended to alert the user to the presence of uninsulated "dangerous voltage" within the product's enclosure that may be of sufficient magnitude to constitute a risk of electric shock to persons.

The exclamation point within an equilateral triangle is intended to alert the user to the presence of important operating and maintenance (servicing) instructions in the literature accompanying the appliance.

TO PREVENT FIRE OR SHOCK HAZARD, DO NOT EXPOSE THIS APPLIANCE TO RAIN OR MOISTURE.

• DO NOT REMOVE THE EXTERNAL CASES OR CABINETS TO EXPOSE THE ELECTRONICS. NO USER SERVICEABLE PARTS ARE INSIDE.
• IF YOU ARE EXPERIENCING PROBLEMS WITH THIS PRODUCT, CONTACT THE STORE WHERE YOU PURCHASED THE UNIT FOR A SERVICE REFERRAL. DO NOT USE THE PRODUCT UNTIL IT HAS BEEN REPAIRED.
• USE OF CONTROLS OR ADJUSTMENTS OR PERFORMANCE OF PROCEDURES OTHER THAN THOSE SPECIFIED HEREIN MAY RESULT IN HAZARDOUS RADIATION EXPOSURE.

1. Read these instructions.
2. Keep these instructions.
3. Heed all warnings.
4. Follow all instructions.
5. Do not use this apparatus near water.
6. Clean only with dry cloth.
7. Do not block any ventilation openings. Install in accordance with the manufacturer's instructions.
8. Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus (including amplifiers) that produce heat.
9. Do not defeat the safety purpose of the polarized or groundingtype plug. A polarized plug has two blades with one wider than the other. A grounding type plug has two blades and a third grounding prong. The wide blade or the third prong are provided for your safety. If the provided plug does not fit into your outlet, consult an electrician for replacement of the obsolete outlet.
10. Protect the power cord from being walked on or pinched particularly at plugs, convenience receptacles, and the point where they exit from the apparatus.
11. Only use attachments/accessories specified by the manufacturer.
12. Use only with the cart, stand, tripod, bracket, or table specified by the manufacturer, or sold with the apparatus. When a cart is used, use caution when moving the cart/apparatus combination to avoid injury from tip-over.
    
13. Unplug this apparatus during lightning storms or when unused for long periods of time.
14. Refer all servicing to qualified service personnel. Servicing is required when the apparatus has been damaged in any way, such as power-supply cord or plug is damaged, liquid has been spilled or objects have fallen into the apparatus, the apparatus has been exposed to rain or moisture, does not operate normally, or has been dropped.

• The apparatus draws nominal non-operating power from the AC outlet with its POWER or STANDBY/ON switch not in the ON position.
• The mains plug is used as the disconnect device; the disconnect device shall remain readily operable.
• Caution should be taken when using earphones or headphones with the product because excessive sound pressure (volume) from earphones or headphones can cause hearing loss.

• Do not expose this apparatus to drips or splashes.
• Do not place any objects filled with liquids, such as vases, on the apparatus.
• Do not install this apparatus in a confined space such as a book case or similar unit.
• The apparatus should be located close enough to the AC outlet so that you can easily reach the power cord plug at any time.
• If the product uses batteries (including a battery pack or installed batteries), they should not be exposed to sunshine, fire or excessive heat.
• 
  CAUTION for products that use replaceable lithium batteries: there is danger of explosion if a battery is replaced with an incorrect type of battery. Replace only with the same or equivalent type.

Products with Class I construction are equipped with a power supply cord that has a grounding plug. The cord of such a product must be plugged into an AC outlet that has a protective grounding connection.

IN USA/CANADA, USE ONLY ON 120 V SUPPLY.

Precautions concerning batteries
Misuse of batteries could cause them to rupture or leak leading to fire, injury or the staining of nearby things. Please read and observe the following precautions carefully.

• Be sure to insert the batteries with correct positive ( ) and negative ( ) orientations.
• Use batteries of the same type. Never use different types of batteries together.
• If the remote control is not used for a long time (more than a month), remove the batteries to prevent them from leaking.
• If the batteries leak, wipe away the leakage inside the battery compartment and replace the batteries with new ones.
• Do not use batteries of types other than those specified. Do not mix new batteries with old ones or use different types of batteries together.
• Do not heat or disassemble batteries. Never throw batteries into fire or water.
• Do not carry or store batteries with other metallic objects. The batteries could short circuit, leak or explode.
• Never recharge a battery unless it is confirmed to be a rechargeable type.

The nameplate is located on the bottom of the unit as shown below.

Documents / Resources

References

• TEAC - Global Site
• TEAC - Global Site

Download manual

Here you can download full pdf version of manual, it may contain additional safety instructions, warranty information, FCC rules, etc.

Download Teac UD-505 - USB DAC / Headphone Amplifier Manual