Teac AI-503 - Amplifier Manual

Before use

Placement precautions

• Place the unit in a stable location near the audio system that you will use with it.
• 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 another amplifier or equipment that generates heat. Doing so could cause discoloration, deformation or malfunction.
• Avoid locations that are subject to vibrations or exposed to excessive dust, cold or moisture.
• 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.
• Do not place anything, not even CDs, CD-Rs, LP records or cassette tapes, on top of the unit. Do not put cloth on top of the unit or place it on top of bedding or thick carpet. Doing so could cause it to overheat or damage it.
• Do not move the unit during use.
• 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 open the body of the unit as this might result in damage to the circuitry or cause electric shock. If a foreign object should get into 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/

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
Remote control (RC-1328) × 1
Batteries for remote control (AAA) × 2
Owner's manual (this document, including warranty) × 1

Connections

Rear panel

1. Digital input (DIGITAL IN) connectors
   USB port
   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 with a Windows computer, you must install the dedicated driver on the computer.
   Proper connection is not possible with a computer that does not have this driver installed.
   RCA COAXIAL digital audio input connector
   Use this to input digital audio. Connect the coaxial digital audio output connector of a digital audio device to it.
   Use a commercially-available RCA coaxial digital cable V for connection.
   Optical digital audio input (OPTICAL 1) connector
   Use this to input digital audio. Connect the optical digital audio output connector of a digital audio device to it.
   Use a commercially-available optical digital cable with square connectors (TOSLINK) for connection.
2. Analog audio input (LINE 1) connectors
   Use these to input 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.
   
3. Preamp audio output (PRE OUT) connectors
   These output analog audio after volume adjustment by this unit.
   Connect these RCA connectors to a power amplifier or speakers with built-in amplifiers.
   Use commercially-available RCA audio cables for connections.
   Connect this unit's R connector to the R connector of the amplifier and its L connector to the L connector of the amplifier.
4. 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

Audio input (IN—LINE 2/OPT 2) connector

This connector combines analog (LINE 2) and optical (OPT 2) inputs.

• The unit will automatically switch to analog (LINE 2) or optical (OPT 2) according to the type of plug connected.

To enable this input, turn the INPUT SELECTOR knob to select LINE 2/OPT 2.

Analog (LINE 2) connection
Use a cable with stereo 3.5 mm mini plugs to connect the headphone (or audio output) connector of a portable audio player, for example, to output its audio playback through this unit.
Use a commercially-available cable with a stereo mini plug for connection.

• When connected to the player's headphone connector, adjusting the volume on the player might be necessary to hear its sound from this unit.
• The sound could distort, however, if you raise the volume of the portable music player too much. If this occurs, lower the volume on the connected player until distortions stops and then adjust the volume on this unit.

Optical (OPT 2) connection
Connect the optical digital audio output connector of a digital audio device here.
Use a commercially-available optical cable with a mini plug for connection.

PHONES jack

• This headphone amp circuit uses a four-pole connector with independent left and right for grounding. Ordinary 3.5 mm stereo mini plugs with 3 or 4 poles can be used.

Wiring illustration

While wearing headphones, do not connect or disconnect them, turn the unit on or off, or switch the headphone amp gain.
Doing so could result in a sudden loud noise that could harm your hearing.
Always set the volume to minimum (−∞ dB) before putting head phones on.

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.

• 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 / ends oriented in the case as shown. 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 speakers

Precautions when making connections

• After completing all other connections, insert the power plug into a power outlet.
• Carefully read the manuals of the devices that you are connecting and follow their instructions when making connections.

ATTENTION

• This unit is compatible with speakers that have 4–8Ω nominal impedance. If speakers with impedance of less than 4 Ω are used, the protection circuit could operate, causing sound output to stop. In some cases, this unit or the speakers could be damaged.
• The red speaker terminals are positive () and the black speaker terminals are negative (). Generally, the wire of the speaker cable is marked to distinguish it from the wire of the cable. Connect the marked wire to the red terminal and the unmarked wire to the black terminal.
• If the exposed core wires at the tips of the speaker cables should touch other cables or terminals, an electrical short might occur.
• Never allow speaker cables to cause a short.
• To prevent hum and noise, avoid bundling the cables together with the AC power cord or other cables.

How to connect speakers

1. Remove about one centimeter of insulation from the end of the speaker cable and twist the core wires well.
2. Turn the terminal cap counterclockwise to loosen it.
3. Insert the wire into the hole in the terminal post and turn the terminal cap clockwise to securely connect it.
   
   • Connect it so that none of the wire insulation is touching the terminal.
4. Confirm that the cable is fastened securely by gently pulling the cable.

Connecting with banana plugs
You can also make connections using commercially-available banana plugs. First, connect the banana plugs to the speaker cables and then connect the plugs to the terminals.

• Keep the caps tightened when in use.
• Carefully read the instructions for the banana plugs that you are using.

Notice about the European model
In accordance with European safety regulations, connecting banana plugs to speaker terminals is not allowed on European models. The holes into which banana plugs could be inserted have been covered with black caps. Connect speakers using bare wires or spade lugs. If a black cap should become separated from its terminal, return it to its original position.

Names and functions of parts

Main unit

1. POWER switch
   Use to turn the unit on and off.
   • If all the input indicators are dark even though the POWER switch is set to ON, the cause is usually one of the following.
     • The remote control STANDBY/ON button has been pressed or the automatic power saving function has activated, putting the unit into standby.
     • The power cord is disconnected.

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

2. Audio input (IN — LINE 2/OPT 2)
   Use this to input audio.
   Analog: Use a cable with a 3.5mm stereo mini plug.
   Optical: Use an optical cable with a mini plug.
3. PHONES jack
   Connect headphones (3.5mm stereo mini plug) here.
   • This headphone amp circuit uses a four-pole connector with independent left and right for grounding. Ordinary plugs with 3 or 4 poles can be used.
   • If headphones are connected here, audio will not be output from the speaker (SPEAKERS) terminals or preamp audio output (PRE OUT) connectors on the back of the unit.
4. GAIN button
   Use to switch the headphone amp gain.
5. INPUT SELECTOR knob
   Use to select the input source.
   The indicator lights next to the selected input source.
   The indicators blink to show when the filter is being changed and audio is muted, for example.
   • Press when (Bluetooth) is selected to enable pairing.
6. Input source indicators
7. Remote control signal receiver
   This receives signals from the remote control. When operating the remote control, point it at the remote control signal receiver.
8. Level meters
   These show the output levels.
9. VOLUME knob
   Use to adjust the volume output from connected speakers or headphones. Turn right to increase and left to decrease the volume.

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.
• Only buttons that can be used with this unit are explained.

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 CD and NET buttons are not used with this unit.
3. FILTER button
   Use to change the filter setting.
   This changes the filter according to the input (PCM or DSD)
4. MUTE button
   Press this button to temporarily mute the sound
5. METER button
   Press to turn level meter operation on and off.
6. DIMMER button
   Use to change the brightness of the level meters and input source indicators.
7. VOLUME (+/−) buttons
   Use these buttons to adjust the volume.
   Pressing these buttons will turn the VOLUME knob on the main unit.

Basic operation

1. Shift the POWER switch to its ON position to turn the unit on.
   
2. Turn the INPUT SELECTOR knob to select the input source.
   
   The indicator lights for the selected source.
   • When a digital input (OPT 1, OPT 2, USB, COAX or ) is selected, no audio will be output 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, DTS or AAC. Set the digital output of the connected device to PCM audio output.
   • To use a Windows computer to play back audio files through this unit when set to USB, you must install a dedicated driver on the computer before connecting them.
   • The DSD format can only be played back through this unit when connected to a computer by USB.
3. Start playback on the connected source device.
   Refer to the operation manual of that device.
4. Adjust the volume.
   
   Turn this unit's VOLUME knob to adjust the volume.
   • You can also do this with the VOLUME (+/−) buttons on the remote control.
   • If headphones are connected to this unit, audio will not be output from the speaker (SPEAKERS) terminals or preamp audio output (PRE OUT) connectors on the back of the unit.

Automatic power saving function

This unit has an automatic power saving function.
If the automatic power saving function is set to on, the unit will automatically enter standby mode if there is no audio input when the input source is LINE or if no input signal is locked and no operation occurs for about 30 minutes when the input source is anything else.
You can check the automatic power saving setting by looking at the input source indicators immediately after turning the unit on.

• All indicators lit: Automatic power saving function off
• No indicators lit: Automatic power saving function on

To switch the automatic power saving function between on and off, when the unit is in standby, press the remote control STANDBY/ON button for three seconds until all the input indicators blink.

Filter

Press the remote control FILTER button once to light the input indicators that show the current filter setting. Press it again to change the filter setting.

The filter settings shown by the lit indicators are shown in the tables below.

For PCM audio sources

Filter	Lit indicators
OFF	LINE 1, OPT 1
FIR Sharp	OPT 1, LINE 2/OPT 2
FIR Slow	LINE 2/OPT 2, USB
Short delay Sharp	USB, COAX
Short delay Slow	COAX,

For DSD audio sources

Cutoff frequency	Lit indicators
kHz	LINE 1, OPT 1, LINE 2/OPT 2
kHz	USB, COAX,

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.

• When muted, the indicator for the selected source lights alternately with the other indicators.

Dimmer

Each time you press the remote control DIMMER button, the brightness of the level meters and input source indicators changes as follows.

• Even when 0 (unlit) is selected, the input source indicator will stay lit very dimly.

Level meters

Press the remote control METER button to switch level meter operation on and off.

• When level meter operation is turned off, the meter backlights will also become unlit.

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
• 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.

• 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 mode to Bluetooth.
   • The Bluetooth indicator blinks and connection with other Bluetooth devices becomes possible.
2. Enable Bluetooth transmission on the other Bluetooth device.
3. Press the INPUT SELECTOR knob to enter pairing mode.
   When this unit is ready to pair, its indicator flashes rapidly.
4. On the other Bluetooth device, select "AI-503" (this unit).
   After preparing this unit to pair, conduct pairing using the other Bluetooth device.
   For details, refer to the operation manual of that Bluetooth device.
   • When this unit and the other Bluetooth device are connected, the Bluetooth indicator stops flashing and stays lit.

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.
• 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 mode to Bluetooth.
   • The Bluetooth indicator blinks and connection with other Bluetooth devices becomes possible.
2. Enable Bluetooth transmission on the other Bluetooth device.
   When the input source of this unit is set to and the other Bluetooth device is on, the Bluetooth function will be active and they will connect automatically.
   If they do not connect automatically, however, you can connect them manually.
   • When is selected for this unit, the Bluetooth device that was last connected to it will automatically be connected again. If you want to connect with a different Bluetooth device, conduct pairing with that device.
   • If the Bluetooth indicator on this unit continues to blink for 30 minutes, it will automatically enter standby mode. To use this unit, you must turn it on again.
     ATTENTION
     Regardless of the connection status of this unit and the other Bluetooth device, if the Bluetooth indicator continues blinking for a long time, restart both this unit and the other device and then reconnect them.
3. 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.
   • 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.
4. Turn the VOLUME knob to adjust the volume.
   • You can also do this with the VOLUME (+/−) buttons on the remote control.
   • If headphones are connected to this unit, audio will not be output from the speaker (SPEAKERS) terminals or preamp audio output (PRE OUT) connectors on the back of the unit.

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, 2016).

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)
This unit can be used with the standard OS driver. For this reason, there is no need to install a special driver or anything else.

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 transmission mode

This unit connects using high-speed asynchronous mode. The sampling frequencies that can be transmitted are 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 is processed using this unit's clock, reducing data transmission jitter.

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 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 commercially-available USB2. 0 cable (A-B type) for this connection.
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.
   Better sound quality can be achieved by maximizing the computer output volume and adjusting the volume output of this unit.
   Minimize this unit's volume before starting playback. Then, gradually turn it up.
   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 i Turning this unit off
  • 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 this unit, please check the following items 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.

• Adjust the VOLUME knob. Turn it clockwise (right) to increase 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.

Sound output suddenly stopped.
The level meter lights are blinking and no sound is output.

• Heat might have caused the protection circuit to activate. Set the POWER switch to OFF once, and wait several minutes before restarting the unit.
• The + and − speaker cables might have shorted. In this case, turn the unit off and check the speaker cable connections.

Automatic power saving caused the unit to enter standby.

• Shift the POWER switch to OFF once and then turn the unit back on.

Computer connection

Computer does not recognize this unit.

e See the information about supported computer 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.

This unit uses a microprocessor, so noise and other external interference could cause it to stop functioning properly. If this occurs, unplug the power cord, wait for a while, and then turn the unit on again and restart operations.

Specifications

Speaker outputs

Maximum output:

• 60 W + 60 W
  (10% distortion, 1 kHz, 4 Ω)
• 30 W + 30 W
  (10% distortion, 1 kHz, 8 Ω)

Rated output:

• 43 W + 43 W
  (1% distortion, 1 kHz, 4 Ω)
• 22 W + 22 W
  (1% distortion, 1 kHz, 8 Ω)

Allowable speaker impedance: 4–8 Ω
Total harmonic distortion: 0.005% or less (1 kHz, 8 Ω, 1 W)
S/N ratio: 100 dB or more (analog input, when 8Ω load, rated output, A-weighted)
Frequency response: 10 Hz – 100 kHz (+1/−3 dB) (8 Ω, 1 W, analog input)

PRE OUT audio outputs

RCA connectors: 1 pair (L/R)

• Output impedance: 150 Ω
• Frequency response: 10 Hz – 100 kHz (+1/−3 dB)
  (analog input, when 200mVrms output)
• S/N ratio: 103 dB or more
  (analog input, when 1kHz/2Vrms output, A-weighted)
• Total harmonic distortion: 0.005% or less
  (analog input, when 1kHz/2Vrms output, 20kHz LPF)

Headphones output

3.5mm 4-pole stereo mini jack: 1

• Practical maximum output: 280 mW + 280 mW
  (GAIN set to HIGH, into 32Ω load, distortion 10%)
• Compatible impedance range: 16–600 Ω

Analog audio inputs

RCA connectors: 1 pair (L/R)

• Input impedance: 30 kΩ
• Maximum input: 2 Vrms

3.5mm stereo mini jack*: 1

• Input impedance: 22 kΩ
• Maximum input: 2 Vrms

Digital audio inputs

COAXIAL digital

• RCA connector: 1

OPTICAL digital

• Square (TOSLINK) connector: 1
• Round connector*: 1
  (−24.0 to −14.5dBm peak)

USB-B port: 1 (USB 2.0 standard)
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

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

*This is a combined analog (LINE 2) and optical (OPT 2) input connector.

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™ audio, 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.

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: 38 W
Standby power: 0.5 W or less (in standby mode)
External dimensions: 290 mm × 81.2 mm × 264 mm (11 1/2" × 3 1/4" × 10 1/2") (W × H × D including protrusions)
Weight: 3.7 kg (8 1/4 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 items

Power cord × 1
Remote control (RC-1328) × 1
Batteries for remote control (AAA) × 2
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

RISK OF ELECTRIC SHOCK
DO NOT OPEN

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 TEAC 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 grounding type 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 120V 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.