Yamaha A-u671 Stereo Amplifier With Usb Dac Function User Guide

Yamaha A-U671 Stereo Amplifier with USB DAC Function

IMPORTANT SAFETY INSTRUCTIONS

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

Explanation of Graphical Symbols
The lightning flash with the arrowhead symbol, within an equilateral triangle, is intended to alert you 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 you to the presence of important operating and maintenance (servicing) instructions in the literature accompanying the appliance.

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 a 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 one wider than the other. A grounding-type plug has two blades and a third grounding prong. The wide blade or the third prong is provided for your safety. If the provided plug does not fit into your outlet, consult an electrician for the 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.

We Want You to Listening For A Lifetime
Yamaha and the Electronic Industries Association’s Consumer Electronics Group want you to get the most out of your equipment by playing it at a safe level. One that lets the sound come through loud and clear without annoying blaring or distortion – and, most importantly, without affecting your sensitive hearing.
Since hearing damage from loud sounds is often undetectable until it is too late, Yamaha and the Electronic Industries Association’s Consumer Electronics Group recommend you avoid prolonged exposure to excessive volume levels.

CAUTION: READ THIS BEFORE OPERATING YOUR UNIT

1. To assure the finest performance, please read this manual carefully. Keep it in a safe place for future reference.
2. Install this sound system in a well-ventilated, cool, dry, clean place – away from direct sunlight, heat sources, vibration, dust, moisture, and/or cold. For proper ventilation, allow the following minimum clearances.
   Top: 10 cm (4 in), Rear: 10 cm (4 in), Sides: 10 cm (4 in)
3. Locate this unit away from other electrical appliances, motors, or transformers to avoid humming sounds.
4. Do not expose this unit to sudden temperature changes from cold to hot, and do not locate this unit in an environment with high humidity (i.e. a room with a humidifier) to prevent condensation inside this unit, which may cause an electrical shock, fire, damage to this unit, and/or personal injury.
5. Avoid installing this unit where foreign objects may fall onto this unit and/or this unit may be exposed to
   liquid dripping or splashing. On the top of this unit, do not place:
   • Other components, as may cause damage and/or discoloration on the surface of this unit.
   • Burning objects (i.e. candles), as they may cause fire, damage to this unit, and/or personal injury.
   • Containers with liquid in them, as they may fall and liquid may cause electrical shock to the user and/or damage to this unit.
6. Do not cover this unit with a newspaper, tablecloth, curtain, etc. in order not to obstruct heat radiation.
   If the temperature inside this unit rises, it may cause fire, damage to this unit, and/or personal injury.
7. Do not plug in this unit to a wall outlet until all connections are complete.
8. Do not operate this unit upside-down. It may overheat, possibly causing damage.
9. Do not use force on switches, knobs and/or cords.
10. When disconnecting the power cable from the wall outlet, grasp the plug; do not pull the cable.
11. Do not clean this unit with chemical solvents; this might damage the finish. Use a clean, dry cloth.
12. Only voltage specified on this unit must be used. Using this unit with a higher voltage than specified is dangerous and may cause fire, damage to this unit, and/or personal injury. Yamaha will not be held responsible for any damage resulting from use of this unit with a voltage other than specified.
13. To prevent damage by lightning, keep the power cable and outdoor antennas disconnected from a wall outlet or this unit during a lightning storm.
14. Do not attempt to modify or fix this unit. Contact qualified Yamaha service personnel when any service is needed. The cabinet should never be opened for any reasons.
15. When not planning to use this unit for long periods of time (i.e. vacation), disconnect the AC power plug from the wall outlet.
16. Be sure to refer to the “Troubleshooting” section for common operating errors before concluding that this unit is faulty.
17. before moving this unit, press A to set it to standby mode and disconnect the AC power plug from the wall outlet.
18. Condensation will form when the surrounding temperature changes suddenly. Disconnect the power cable from the outlet, then leave this unit alone.
19. When using this unit for a long time, this unit may become warm. Turn the power off, then leave this unit alone for cooling.
20. Install this unit near the AC outlet and where the AC power plug can be reached easily.
21. The batteries shall not be exposed to excessive heat such as sunshine, fire or the like. When you dispose of batteries, follow your regional regulations.
22. Excessive sound pressure from earphones and headphones can cause hearing loss.

WARNING
TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT EXPOSE THIS UNIT TO RAIN OR MOISTURE.
This unit is not disconnected from the AC power source as long as it is connected to the wall outlet, even if this unit itself is turned off by A. This state is called the standby mode. In this state, this unit is designed to consume a very small quantity of power.

Notes on remote controls and batteries

• Do not spill water or other liquids on the remote control.
• Do not drop the remote control.
• Do not leave or store the remote control in the following conditions:
  • places of high humidity, such as near a bath
  • places of high temperatures, such as near a heater or stove
  • places of extremely low temperatures
  • dusty places
• Insert the battery according to the polarity markings (+ and -).
• Change all batteries if you notice the following conditions:
  • the operation range of the remote control narrows
  • the transmit indicator does not flash or is dim
• If the batteries run out, immediately remove them from the remote control to prevent an explosion or acid leak.
• If you find leaking batteries, discard the batteries immediately, taking care not to touch the leaked material. If the leaked material comes into contact with your skin or gets into your eyes or mouth, rinse it away immediately and consult a doctor. Clean the battery compartment thoroughly before installing new batteries.
• Do not use old batteries together with new ones. This may shorten the life of the new batteries or cause the old batteries to leak.
• Do not use different types of batteries (such as alkaline and manganese batteries) together. Specifications of batteries may be different even though they look the same. The danger of explosion may happen if batteries are incorrectly replaced.
• Before inserting new batteries, wipe the compartment clean.
• Dispose of batteries according to your regional regulations.
• Keep batteries away from children. If a battery is accidentally swallowed, contact your doctor immediately.
• When not planning to use the remote control for long periods of time, remove the batteries from the remote control.
• Do not charge or disassemble the supplied batteries.
  The user shall not reverse engineer, decompile, alter, translate or disassemble the software used in this unit, whether in part or in whole. For corporate users, employees of the corporation itself as well as its business partners shall observe the contractual bans stipulated within this clause. If the stipulations of this clause and this contract cannot be observed, the user shall immediately discontinue using the software.

INTRODUCTION

What the unit can do

• The unit is an integrated amplifier that plays back analog stereo signals with high-quality sound. Combined with speakers, the unit can play back music with high audio quality.
• TREBLE (high-frequency range), BASS (low-frequency range), and BALANCE (right and left balance) can be desirably adjusted with the controls on the front panel.
• The USB DAC function allows you to play back music stored on a PC (+page 11).
• Enjoy pure, high-fidelity sound by using the PURE DIRECT function (+page 13).
• Boost bass sounds by connecting a subwoofer (+page 9).

Supplied accessories
Please check that you received all of the following parts.

NAMES AND FUNCTIONS OF THE PARTS

Front panel

1. (Power) button
   Turns this unit on, or sets it to standby mode.
   Notes
   In standby mode, the unit consumes a small amount of power.
2. Power indicator
   Lights up when the unit is turned on.
3. pHONES jack
   Connect your headphones.
   Notes
   When headphones are connected, no sound comes from the speakers or subwoofer.
4. BASS control
   Increases or decreases the low-frequency response.
   Control range: –10 dB to +10 dB
5. TREBLE control
   Increases or decreases the high-frequency response.
   Control range: –10 dB to +10 dB
6. BALANCE control
   Adjusts the sound output balance of the left and right speakers to compensate for
   sound imbalances.
7. VOLUME control
   Adjusts the volume.
8. USB DAC indicators
   Lights up when audio signals are input to the USB jack of this unit (+page 12).
9. PURE DIRECT indicator
   Lights up when the PURE DIRECT function is turned on (+page 13).
10. INPUT button and indicator
    Each time you press the button, the input source switches to LINE or USB. The input source indicators light up when the corresponding input sources are selected.
    Press and hold the button to switch the PURE DIRECT function on or off.
11. Remote control sensor
    Receives infrared signals from the remote control.

Rear panel

1. USB (Type B) jack
   Used to connect a PC (+page 8).
2. LINE IN jacks
   Used to connect an external component (+page 8).
3. SUBWOOFER jack
   Used to connect a subwoofer with a built-in amplifier (+page 8).
4. SPEAKERS terminals
   Used to connect speakers (+page 8).
5. Power cable

Remote control

1. Infrared signal transmitter
   Sends infrared signals.
2. A (Power)
   Turns this unit on, or sets it to standby mode.
3. PURE DIRECT
   Reproduces any input source in the purest sound possible (+page 13).
4. Input selector buttons
   Selects the input source (LINE or USB) you want to listen to.
5. VOL +/–
   Adjusts the volume.
6. MUTE
   Reduces the current volume level by approximately 20 dB. Press again to restore the audio output to the previous volume level. Pressing the VOL +/– also cancels muting. The INPUT indicator on the front panel for the current input source blinks while the output is muted.

Installing batteries

Notes

• The area between the remote control and this unit must be clear of large obstacles.
• Change all batteries if you notice the operation range of the remote control narrows.

Operation range
Point the remote control at the remote control sensor on this unit and remain within the operating range shown below.

CONNECTIONS

Make sure to connect L (left) to L, R (right) to R, “+” to “+” and “–” to “–.” If the connections are faulty, no sound may be heard from the speakers, and if the polarity of the speaker connections is incorrect, the sound may be unnatural and lack bass. Refer to the owner’s manual for each of your components.
Make sure to use RCA-type cables or commercially available USB cables to connect audio components.

CAUTION

Do not connect this unit or other components to the main power until all connections between components are complete.

Connecting an external component

Connect the analog audio output jacks of the external component to the LINE IN jacks of the unit as shown in the figure.

Connecting speakers

Connect the SPEAKERS terminals of the unit and the terminals of the speakers as shown in the figure.

Connecting speaker cables

1. Remove approximately 10 mm (3/8”) of insulation from the end of each speaker cable.
2. twist the bare wires of the cable firmly together.
3. Unscrew the knob.
4. Insert one bare wire into the hole in the side of each terminal.
5. Tighten the knob to secure the wire.

CAUTION

• Use speakers with an impedance of 6 Ω or higher.
• Do not let bare speaker wires touch each other or any metal part of this unit. This could damage this unit and/or the speakers.

Using a banana plug (North America, China and Australia models only)

1. Tighten the knob.
2. Insert the banana plug into the end of the corresponding terminal.

Connecting a subwoofer

To use a subwoofer, connect the jack of the subwoofer to the SUBWOOFER jack of the unit as shown in the figure.

Connecting to a power source

After all the connections are complete, plug in the power cable to the AC outlet.

PLAYBACK

Playing a source

1. Rotate the VOLUME control on the front panel fully counter-clockwise as not to play sounds loud suddenly.
2. Press the A (power) button on the front panel (or press the (power) button on the remote control) to turn on the unit.
3. Press the INPUT button on the front panel (or press the input selector buttons on the remote control) to select LINE or USB.
   The indicator for the selected input source lights up.
4. Play the selected input source.
5. Rotate the VOLUME control on the front panel (or press VOL +/– on the remote control) to adjust the volume.
6. When finished listening, press the (power) button on the front panel (or press the (power) button on the remote control) to set the unit to standby mode.

Auto power standby function

• The auto power standby function will be activated as follows (default setting).
• The unit turn off automatically if no operation has been performed for more than 8 hours.

Activating/deactivating the auto power standby function

1. While pressing and holding (power) on the unit, plug in the power cable to the AC outlet.
2. Keep pressing A (power).
   • The auto power standby function switches and the power indicator blink as follows:
     • Auto power standby function is activated: blink twice
     • Auto power standby function is deactivated: blink once.

PLAYING BACK MUSIC STORED ON A PC (USB DAC FUNCTION)

When a PC is connected to the USB jack of the unit, the unit works as a USB DAC and can play back songs stored on the PC.

Supported operating systems
The USB connection is available for PCs with the following operating systems:
For Windows: Windows 7 (32/64bit) / Windows 8 (32/64bit) /Windows 8.1 (32/64bit)
For Mac: OS X 10.6.4 or later

Notes

• Operations with other operating systems are not guaranteed.
• Operations may be disabled even with the above-mentioned operating systems, depending on the configuration or environment of the PC.

Installing the dedicated driver

Before connecting a PC to this unit, install the dedicated driver on the PC. The dedicated driver is available only for Windows. For Mac, the standard driver of Mac OS is available for setting.

1. Access the following URL to download the dedicated “Yamaha HiFi USB Driver,” and unzip and execute the file.
   Website for downloading the dedicated driver URL: http://download.yamaha.com/
2. Install the downloaded “Yamaha HiFi USB Driver” to your PC.
   For details, refer to the Installation Guide supplied with the downloaded driver.
3. When the installation is complete, quit all running applications.
   Notes
   • Operations may not be executed correctly if the PC is connected to this unit before the driver is installed.
   • The “Yamaha HiFi USB Driver” is subject to change without prior notice. For details and the latest information, refer to the download page for the driver.

PLAYING BACK MUSIC STORED ON A PC (USB DAC FUNCTION)

Playing back music stored on a PC

1. Connect the PC to the unit with a USB cable.
2. Turn on the PC.
3. Press the A (power) button on the front panel (or press (power) button on the remote control) to turn on the unit.
4. Press the INPUT button on the front panel (or press USB on the remote control) to select USB.
5. Set the audio output destination of the PC to “Yamaha A-U670/A-U671.”
   With Windows OS:
   Control Panel -> Hardware and Sound -> Sound -> [Playback] tab
   With Mac OS:
   System Preferences -> Sound -> [Output] tab
   The setting may vary, depending on the operating systems. For details, consult the manufacturer of your PC.
6. Operate the PC to start playback of music files.
   When the music signal is input from the PC to the unit, the USB DAC indicator on the front panel lights up in accordance with the sampling frequency of the music being played. Sampling frequencies available for the unit are as follows:

   Indicator		Frequency
   PCM	×1	44.1/48 kHz
   	×2	88.2/96 kHz
   	×4	176.4/192 kHz
   	×8	352.8/384 kHz
   DSD	×1	2.8224 MHz
   	×2	5.6448 MHz

Adjusting the sound volume
To obtain higher sound quality, set the sound volume at the PC to the maximum, and gradually increase the volume at this unit from the minimum to your desired level.

Notes

• Do not disconnect the USB cable, turn off the unit, or change the input while playback on a PC connected via the USB cable is in progress. Doing so may cause a malfunction.
• To mute operation sounds of the PC during music playback, change the setting on the PC.
• If music files cannot be played correctly, restart the computer and perform the mentioned procedure again.
• The music files stored on a PC cannot be controlled from this unit. Operate them on the PC.

ADJUSTING TO THE DESIRED SOUND

Reproducing pure, high-fidelity sound (PURE DIRECT)
With the PURE DIRECT function on, the BASS, TREBLE, and BALANCE circuits are bypassed to reduce noises. Therefore, in all input sources, you can enjoy music playback in straight and high-quality sound. Hold down the INPUT button on the front panel (or press the PURE DIRECT button on the remote control) to switch the PURE DIRECT function on or off. The PURE DIRECT indicator lights up when this function is turned on.

note
The BASS, TREBLE, and BALANCE controls do not function while the PURE DIRECT function is turned on.

TROUBLESHOOTING

Refer to the chart below if this unit does not function properly. If the problem you are experiencing is not listed below or if the instructions below do not help, turn off this unit,
disconnect the power cable, and then contact the nearest authorized Yamaha dealer or service center.

SPECIFICATIONS

AUDIO SECTION

LINE IN

• Input jack:RCA jack

USB

• Input jack: USB (Type B), supported USB2.0
• Supported sampling frequencies: 384/352.8/192/176.4/96/88.2/48/44.1 kHz
• PCM word depths:32/24/16 bits
• DSD:2.8224/5.6448 MHz

SPEAKERS

• Maximum output power (6 Ω, 1 kHz, 10% THD):70 W + 70 W
• Frequency response (10 Hz to 40 kHz):0±3 dB
• Total harmonic distortion (30 W/6 Ω, 1 kHz):0.05% or less

PHONES

• Output level/Output impedance (Input 1 kHz, 230 mV, 32 Ω terminated):500 mV/24 Ω

SUBWOOFER

• Output level/Output impedance (Input 1 kHz, 230 mV):2.0 V/1 kΩ

GENERAL

• Power supply
  [U.S.A. and Canada models] : AC 100 to 120 V, 50/60 Hz
  [Asia model]:AC 220 to 240 V, 50/60 Hz
• Power consumption:30 W
• Standby power consumption: 0.5 W
• Dimensions (W × H × D):314 × 70 × 342 mm (12-3/8″ × 2-3/4″ × 13-1/2″)
• Weight:3.3 kg (7.3 lbs.)
  Specifications are subject to change without notice.

FAQS

Is this good for headphones?