Teac NT-503 - USB DAC / Network Player Manual

Included items

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-1320) × 1
Batteries for remote control (AAA) × 2
Owner's manual (this document) × 1

• Keep this manual in a safe place for future reference.

Warranty card × 1 (for users in the USA and Canada only)

Before use

Precautions for use

• 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.
• Place the unit in a stable location near the audio system that you will use with it.
• DO NOT place anything, not even CDs, CD-Rs, LP records or cassette tapes, on top of the units. Doing so could cause damage.
• 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.

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 socket 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/

Downloading the remote app

To play back files on USB flash drives and to use the unit connected to a network, install the dedicated app (free) on a smartphone or tablet, and connect it to the same network as the unit.

• For details, see the Network Manual.

If you install the app on an iPad/iPhone/iPod touch or Android device, you can use it over a wireless network for basic control of the unit.

• You can download and use the app for free.
  

How to download the iPad/iPhone/iPod touch app
Search for "TEAC HR Remote" in the App Store.

How to download the Android app
Search for "TEAC AVR Remote" on the Google Play website.

Connections

Connect cables for the pair set for line output (See "Settings"). Sound will only be output from the selected pair.
If headphones are connected, sound will stop being output from the rear panel connectors.
The polarity of the XLR connectors can be set so that either 2 or 3 is HOT (See "Settings").

1. ETHERNET port
   Connect a commercially-available LAN cable to this port when you want to connect this unit to a wired network or the Internet. o When switching input sources, this port is labeled "NET".
2. CLOCK SYNC input connector (10MHz IN)
   Input a synchronization signal (clock sync) here.
   To input a 10MHz oscillator signal, connect the oscillator output here.
   • Use a commercially-available BNC coaxial cable (50 Ω) for connection.
   • Clock sync is only possible when the input source is USB, USBf or NET.
3. 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.
4. 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 rectangular connector for connection.
5. Analog audio output connectors (LINE OUT)
   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.
6. USB port (rear)
   Use 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 on a computer").
Proper connection is not possible with a computer that does not have this driver installed.

7. Power inlet (~IN)
   Insert the included power cord here.
   After completing all other connections, insert the power plug into a power outlet.

Use only the included power cord. 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 connections

USB flash drives

Connect USB flash drives to the USB port on the front of the unit. To play music files on a USB flash drive, set the input source to NET and use the app for playback.

• For details, see the Network Manual.

Digital audio input

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

Optical (OPT) connection
Use a commercially-available optical cable with a mini plug.
To enable this input, turn the INPUT SELECTOR knob to select OPTf.

• The "f" indicates the front panel.

Coaxial (COAX) connection
Use the included RCA conversion cable and a commerciallyavailable RCA coaxial digital cable.
To enable this input, turn the INPUT SELECTOR knob to select COAXf.

• The "f" indicates the front panel.

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.
Always set the volume to minimum (−∞ dB) before putting headphones on (See "Basic operation").

Upconversion

You can use the upconversion function with all input sources (See "Settings > Upconversion").
The relationships between input sampling frequencies and sampling frequencies after upconversion are as follows.

Values indicated by are unchanged.

Names and functions of parts

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 put 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 connector (10MHz IN).
Blinking:	No clock is being input or the unit is not being synchronized.
Unlit:	No clock sync is occurring.

• See "Settings > Clock sync" for clock sync settings.

3. Digital audio input (OPT/COAX IN)
   Use this to input digital audio (see "Digital audio input").
   Optical connection: Use an optical cable with a mini plug.
   Coaxial connection: Use the included RCA conversion cable.
4. INPUT SELECTOR 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. USB port (front)
   Connect USB flash drives here.
   • To play music files on a USB flash drive, set the input source to NET and use the app for playback.
   • Do not connect a computer to the USB port on the front of the unit. To input audio from a computer, connect it to the USB port on the back of the unit.
   • For details, see the Network Manual.
8. PHONES jack
   Connect headphones with a standard 6.3 mm (1/4") stereo plug here (see "Connecting headphones").
   • If headphones are connected to this unit, audio will not be output from the analog audio outputs on the rear panel.
9. Display
   This display shows information about the audio playing back and menu screens.
10. VOLUME knob
    Use to adjust the headphones output 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 (See "Settings > 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.

Remote control

1. STANDBY/ON button
   Press to put the unit into standby mode or turn it on.
2. INPUT buttons
   Use to select the playback source.
   • The USB button selects the rear USB port.
   • The TUNER button is not used with this unit.
3. UPCONVERT button
   Use to change the upconversion setting.
4. FILTER button
   Use to change the filter setting. This changes the filter according to the input (PCM or DSD).
5. Up/down ( ) buttons
   Use to select setting items.
6. MUTE button
   Press to mute the sound temporarily.
7. DIMMER button
   Use to adjust the brightness of the main unit's display.
8. INFO, PROGRAM and CLEAR buttons
   These buttons are not used with this unit.
9. MENU button
   Press to enter setting mode (see "Settings").
   Press when in setting mode to return to the previous screen.
10. ENTER button
    Press to confirm the selected item.
11. VOLUME (+/−) buttons
    Use these buttons to adjust the volume.

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.

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 SELECTOR knob to select the input source.
   

The selected source appears on the display.

• You can also use the the input 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, "NOT AUDIO!" will appear on the screen and no audio will be output. Set the digital output of the connected device to PCM audio output.
• To use a computer running a Windows OS 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 on a computer").
• DSD data can only be played back using the front and rear USB ports or a DoP format digital input.
• To use NET or the front USB port, install the dedicated app (free) on a smartphone or tablet, and connect it to the same network as the unit.

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.

Display

When on

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

Input source information display

The input source information display will appear after turning the unit on as well as when about 10 seconds pass without operation when a setting screen is open.

Display example

When headphones are not connected and LINE OUT LEVEL is set to FIX or OFF

• Turning the VOLUME knob will not change the volume.

When headphones are connected or LINE OUT LEVEL is set to VARIABLE

• Turning the VOLUME knob will change the volume, and the volume will appear to the right of the input signal status.

Input source name

This shows the name of the selected source.
The names shown on the display correspond to the selected connectors as follows.

USB
USB port (rear)

COAX
RCA COAXIAL digital audio input connector on the rear panel

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

OPT
OPTICAL digital audio input connector on the rear panel

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

NET
ETHERNET port

USBf
USB port (front) o Set the input source to NET and then select this with the app.

Bluetooth
Bluetooth device

Audio data processing methods

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

2Fs
4Fs
8Fs
DSD
The upconversion shown will be used (see "Settings").

DoP
DSD signal is received by DoP (DSD over PCM) method.

Digital filter setting

This shows the digital filter setting (see "Settings").

Input signal status

This shows the input source signal status.

UNLOCK!
The unit cannot synchronize with the input signal.

NOT AUDIO!
A signal with a format that cannot be played is being received.60

UNCONNECTED!
The input source is USB (rear USB port), but no USB cable is connected to the unit.
The input source is NET, but no USB cable is connected to the unit.
The input source is USBf (front USB port), but no USB flash drive is connected to the unit.

READY
The input source is USB (rear USB port), NET or USBf (front USB port) and a device is connected, but no audio signal is being received.

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
DSD 2.8MHz
DSD 5.6MHz
DSD 11.2MHz
These show the input signal type and sampling frequency.

SBC
AAC
aptX
When the input source is Bluetooth, the codec type is shown.

Volume display

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

Display example

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.

• SBC
• AAC
• Qualcomm aptX audio

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

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 you connect with that Bluetooth device.

1. Turn the INPUT SELECTOR knob to select Bluetooth.
   
   • If no paired device is available, "NO PAIRED DEVICE" will appear.
2. Enable Bluetooth transmission on the other Bluetooth device.
3. Press and hold the INPUT SELECTOR knob to enter pairing mode.
   
   • "PAIRING" blinks when pairing.
4. On the other Bluetooth device, select "NT-503" (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 input source.
   • If a request for a passcode appears on the screen of the Bluetooth device, enter "0000" (four zeros).

Playback from a Bluetooth device

• Pair this unit the first time you use it and when you want to connect it with a new Bluetooth device (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. Turn the INPUT SELECTOR knob to select Bluetooth.
   This sets the source to Bluetooth.
   • You can also use the Bluetooth button on the remote control. Since the unit retains the same source mode when in standby, this step can be skipped if the unit was in Bluetooth mode when put into standby.
2. Enable Bluetooth transmission on the other Bluetooth device.
3. Press the INPUT SELECTOR knob to show already paired Bluetooth devices.
   The bottom line of the display shows the name of the last connected device.
   
   • You can also use the ENTER button on the remote control.
   • The first 14 characters of the device name are shown.
   • If no paired device is available, the display will appear as follows.
     

Press and hold the INPUT SELECTOR knob to enter pairing mode (see above).

4. Press the INPUT SELECTOR knob to connect.
   • If there are multiple paired devices, turn the INPUT SELECTOR knob to show other devices. When the name of the device that you want to connect is shown, press the INPUT SELECTOR knob.
     After connection, the display will show the input source.
     
   • The first 5 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.

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.

5. 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.
6. Turn this unit's VOLUME knob to adjust the volume.
   • You can also use the VOLUME buttons on the remote control.
   • Depending on the connected Bluetooth device, you might not be able to adjust the volume. For details, refer to the operation manual of that Bluetooth device.

Muting playback
If you want to temporarily mute the volume of this unit, press the MUTE button on the remote control.
Press the MUTE button on the remote control again to return to the previous volume level.

Settings

1. Press the MENU button to show the setting items.
   
2. Turn the INPUT SELECTOR knob to show the setting to be changed.
   
   • You can also use the up and down (k, j) buttons on the remote control.

The menu items appear in the following order.

*For details, see the Network Manual.
**Shown only when the input source is NET/USBf

3. Press the INPUT SELECTOR knob to confirm the selection.
   
   • You can also press the ENTER button on the remote control.
   • The currently set value is shown on the display.
4. Turn the INPUT SELECTOR knob to change the setting value.
   • You can also use the up and down ( ) buttons on the remote control.
   • Press the MENU button to return to setting item selection.
5. 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 10 seconds, the display will return to showing the input source status.

Upconversion

Use to activate the upconversion circuit when receiving PCM format 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.

2Fs
If the input audio signal is less than 2× a standard sampling frequency (32, 44.1 or 48 kHz), it is upconverted 2× and then sent to the D/A converter.

4Fs
If the input audio signal is less than 4× a standard sampling frequency (32, 44.1 or 48 kHz), it is upconverted 4× and then sent to the D/A converter.

8Fs
If the input audio signal is less than 8× a standard sampling frequency (32, 44.1 or 48 kHz), it is upconverted 8× and then sent to the D/A converter.

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

PCM digital filter

Use to set the digital filter when receiving PCM format signals.

OFF
The digital filter is disabled.

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

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

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

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

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

DSD digital filter

Use to set the digital filter when receiving DSD format signals.

CUTOFF 50kHz
50kHz cutoff frequency

CUTOFF 150kHz
150kHz cutoff frequency

Clock sync

• Clock sync is only possible when the input source is USB (rear USB port), NET or USBf (front USB port).
  

OFF
No clock sync is used.

ON
This unit's master clock will be synchronized to the 10MHz clock input through the clock 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.

XLR2
Output through the XLR connectors with 2: HOT polarity.

XLR3
Output through the XLR connectors with 3: HOT polarity.

Line output level

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

FIX 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.

FIX +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 FIX 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.

Display brightness

DIMMER 3
Ordinary brightness

DIMMER 2
Slightly dim

DIMMER 1
Even dimmer

DIMMER 0
Display off

• The display stays unlit even when the unit is on.
• Errors will be shown at ordinary brightness regardless of this setting.

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
If no input signal is locked for about 20 minutes, the unit will automatically enter standby mode.

Playing back music on a computer

Installing the driver on a computer

This unit can be connected with computers running the following operating systems. Operation with other operating systems is not guaranteed (As of October, 2015).

When using OS X
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)

This unit will run with the standard OS driver, so there is no need to install a special driver.

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://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 the transmission mode

This unit connects using high-speed asynchronous mode.
The sampling frequencies that can be transmitted are 32, 44.1, 48, 88.2, 96, 176.4, 192, 352.8 and 384 kHz.

When properly connected, you will be able to select "TEAC USB AUDIO DEVICE" as an audio output from the computer OS.

• In asynchronous mode, 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 11.2MHz DSD recordings with TEAC HR Audio Player, open the Configure window and set the "Decode mode" to "DSD Native."
To play formats other than 11.2MHz DSD, you can set this to either "DSD over PCM" or "DSD Native" as you like.
For details, see "Selecting the DSD decoding mode" in the TEAC HR Audio Player Owner's Manual.

Playing back audio files from a computer

1. Connect the USB port on the back of 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 SELECTOR 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
  • Putting this unit into standby
  • 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 SELECTOR 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.

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

• This unit can be connected with computers running the following operating systems. Operation with other operating systems is not guaranteed (As of October, 2015).

OS X
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)

• This unit can be used with the standard OS driver.

Windows
Windows 7 (32/64-bit)
Windows 8 (32/64-bit)
Windows 8.1 (32/64-bit)
Windows 10 (32/64-bit)

• Requires installation of a dedicated driver (see "Installing the driver on a computer").

Noise occurs

• Starting other applications during playback of a music 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 music playback software.
  If you connect this unit to the computer or set its input to USB after launching audio playback software, music 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

ATTENTION
This initializes all settings, including network settings.

1. While pressing and holding the MENU button, set the POWER switch to ON.
   
2. Release the MENU button when the "SETUP CLEAR" message appears.
   The factory default settings are the setting values shown in the screen images used in the explanations in this manual.

ATTENTION
After "SETUP CLEAR" appears for a few seconds, the following startup screens appear.
Do not put the unit into standby until the startup screens have been shown.

IMPORTANT SAFETY INSTRUCTIONS

TO REDUCE THE RISK OF ELECTRIC SHOCK, DO NOT REMOVE COVER (OR BACK). NO USER- SERVICEABLE 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
• App Store - Apple
• Google Play

Download manual

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

Download Teac NT-503 - USB DAC / Network Player Manual