Yamaha A-670, A-U670 Owners Manual

Integrated Amplifier / Amplificateur Intégré

OWNER’S MANUAL

MODE D’EMPLOI

MANUAL DE INSTRUCCIONES

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ULV

IMPORTANT SAFETY INSTRUCTIONS

CAUTION

RISK OF ELECTRIC SHOCK

DO NOT OPEN

CAUTION: TO REDUCE THE RISK OF

ELECTRIC SHOCK, DO NOT REMOVE

COVER (OR BACK). NO USER-SERVICEABLE

PARTS INSIDE. REFER SERVICING TO

QUALIFIED SERVICE PERSONNEL.

• Explanation of Graphical Symbols

The lightning flash with 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.

3Heed all warnings.

4Follow all instructions.

5 Do not use this apparatus near water.

6Clean only with dry cloth.

7 Do not block any ventilation openings. Install in accordance with the manufacturer’s instructions.

8Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus (including amplifiers) that produce heat.

9Do 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.

10Protect the power cord from being walked on or pinched particularly at plugs, convenience receptacles, and the point where they exit from the apparatus.

11Only use attachments/accessories specified by the manufacturer.

12Use 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.

14Refer 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 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 to avoid prolonged exposure from excessive volume levels.

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FCC INFORMATION (for US customers)

1IMPORTANT NOTICE: DO NOT MODIFY THIS UNIT!

This product, when installed as indicated in the instructions contained in this manual, meets FCC requirements. Modifications not expressly approved by Yamaha may void your authority, granted by the FCC, to use the product.

2IMPORTANT: When connecting this product to accessories and/or another product use only high quality shielded cables. Cable/s supplied with this product MUST be used. Follow all installation instructions. Failure to follow instructions could void your FCC authorization to use this product in the USA.

3NOTE: This product has been tested and found to comply with the requirements listed in FCC Regulations, Part 15 for Class “B” digital devices. Compliance with these requirements provides a reasonable level of assurance that your use of this product in a residential environment will not result in harmful interference with other electronic devices.

This equipment generates/uses radio frequencies and, if not installed and used according to the

instructions found in the users manual, may cause interference harmful to the operation of other electronic devices.

Compliance with FCC regulations does not guarantee that interference will not occur in all installations. If this product is found to be the source of interference, which can be determined by turning the unit “OFF” and “ON”, please try to eliminate the problem by using one of the following measures:

Relocate either this product or the device that is being affected by the interference.

Utilize power outlets that are on different branch (circuit breaker or fuse) circuits or install AC line filter/s.

In the case of radio or TV interference, relocate/reorient the antenna. If the antenna lead-in is 300 ohm ribbon lead, change the lead-in to coaxial type cable.

If these corrective measures do not produce satisfactory results, please contact the local retailer authorized to distribute this type of product. If you can not locate the appropriate retailer, please contact Yamaha Corporation of America A/V Division, 6600 Orangethorpe Avenue, Buena Park, CA 90620. The above statements apply ONLY to those products distributed by Yamaha Corporation of America or its subsidiaries.

FCC CAUTION

Change or modifications not expressly approved by the party responsible for compliance could void the user’s authority to operate the equipment.

FOR CANADIAN CUSTOMERS

To prevent electric shock, match wide blade of plug to wide slot and fully insert. CAN ICES-3 (B)/NMB-3(B)

IMPORTANT

Please record the serial number of this unit in the space below. MODEL:

Serial No.:

The serial number is located on the rear of the unit. Retain the Owner’s Manual in a safe place for future reference.

IMPORTANT SAFETY INSTRUCTIONS

COMPLIANCE INFORMATION STATEMENT

Responsible Party: Yamaha Corporation of America A/V Division Address: 6600 Orangethorpe Avenue, Buena Park, CA 90620 Telephone: [phone]

Type of Equipment: Integrated Amplifier Model Name: A-670/A-U670

This device complies with Part 15 of the FCC Rules.

Operation is subject to the following two conditions: (1) this device may not cause harmful interference, and (2) this device must accept any interference received including interference that may cause undesired operation.

English

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CAUTION: READ THIS BEFORE OPERATING YOUR UNIT.

1To assure the finest performance, please read this manual carefully. Keep it in a safe place for future reference.

2Install 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.) *Except for CD-NT670

3 Locate this unit away from other electrical appliances, motors, or transformers to avoid humming sounds.

4Do 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.

5Avoid installing this unit where foreign object 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 they 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.

6Do 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.

7Do 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.

9Do not use force on switches, knobs and/or cords.

10When disconnecting the power cable from the wall outlet, grasp the plug; do not pull the cable.

11Do not clean this unit with chemical solvents; this might damage the finish. Use a clean, dry cloth.

12Only 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.

13To prevent damage by lightning, keep the power cable and outdoor antennas disconnected from a wall outlet or this unit during a lightning storm.

14Do 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.

15When not planning to use this unit for long periods of time (i.e. vacation), disconnect the AC power plug from the wall outlet.

16Be sure to refer to the “Troubleshooting” section for common operating errors before concluding that this unit is faulty.

17Before moving this unit, press A to set it to standby mode and disconnect the AC power plug from the wall outlet.

18Condensation will form when the surrounding temperature changes suddenly. Disconnect the power cable from the outlet, then leave this unit alone.

19When using this unit for a long time, this unit may become warm. Turn the power off, then leave this unit alone for cooling.

20Install this unit near the AC outlet and where the AC power plug can be reached easily.

21 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.

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.

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CONTENTS		INTRODUCTION

INTRODUCTION ...................................................................	2
What the unit can do ......................................................................................	2
Supplied accessories......................................................................................	2
NAMES AND FUNCTIONS OF THE PARTS .....................................	3
Front panel .....................................................................................................	3
Rear panel ......................................................................................................	4
CONNECTIONS ....................................................................	5
Connecting a network CD player ....................................................................	5
Connecting speakers ......................................................................................	5
Connecting a subwoofer.................................................................................	6
Connecting to power source ..........................................................................	6
PLAYBACK .........................................................................	7
Playing a source.............................................................................................	7
PLAYING BACK MUSIC STORED ON A PC
(USB DAC FUNCTION) (A-U670 only)........................................	8
ADJUSTING TO THE DESIRED SOUND (A-U670 only) ......................	10
INTERLOCKING WITH A NETWORK CD PLAYER.............................	10
Operating the power with the remote control ...............................................	10
Adjusting the sound volume with the remote control...................................	10
Operating mute with the remote control.......................................................	10
Selecting input (A-U670 only) ......................................................................	10
TROUBLESHOOTING.............................................................	11
SPECIFICATIONS.................................................................	13

What the unit can do

uThe 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.

uTREBLE (high-frequency range), BASS (low-frequency range), and BALANCE (right and left balance) can be desirably adjusted with the controls on the front panel.

uThe USB DAC function allows you to play back music stored on a PC (+page 8).(A- U670 only)

uEnjoy pure, high fidelity sound by using the PURE DIRECT function (+page 10).(A- U670 only)

uBoost bass sounds by connecting a subwoofer (+page 6).

Supplied accessories

Please check that you received all of the following parts.

System connection cable

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NAMES AND FUNCTIONS OF THE PARTS

Front panel

English

1A (Power) button

Turns this unit on, or sets it to standby mode.

Notes

In standby mode, the unit consumes a small amount of power.

2Power indicator

Lights up when the unit is turned on.

3PHONES jack

Connect your headphones.

Notes

When headphones are connected, no sound comes from the speakers or subwoofer.

4BASS control

Increases or decreases the low frequency response. Control range: –10 dB to +10 dB

(A-U670)

5TREBLE control

Increases or decreases the high frequency response. Control range: –10 dB to +10 dB

6BALANCE control

Adjusts the sound output balance of the left and right speakers to compensate for sound imbalances.

7VOLUME control

Adjusts the volume.

8USB DAC indicators (A-U670 only)

Lights up when audio signals are input to the USB DAC jack of this unit (+page 9).

9PURE DIRECT button and indicator (A-U670 only)

Reproduces any input source in the purest sound possible (+page 10). The indicator lights up when the PURE DIRECT function is turned on.

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NAMES AND FUNCTIONS OF THE PARTS

Rear panel

(A-U670)

1	USB DAC (Type B) jack (A-U670 only)	5	SPEAKERS terminals
	Used to connect a PC (+page 5).		Used to connect speakers (+page 5).
2	ANALOG IN jacks	6	Power cable
	Used to connect a network CD player (+page 5).

3SYSTEM jack

Used to connect a network CD player (+page 5).

4SUBWOOFER jack

Used to connect a subwoofer with built-in amplifier (+page 5).

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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, the supplied system connection cable, or a commercially available USB cables (A-U670 only) 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 a network CD player		Connecting speakers

As shown in the figure, connect the ANALOG OUT jacks of the network CD player (CDNT670) to the ANALOG IN jacks of the unit by using the RCA stereo cable supplied with the network CD player, and connect the SYSTEM jacks of the both equipment to each other by using the supplied system connection cable.

When the SYSTEM jacks of the unit and the network CD player are connected to each other, you can use the remote control of the network CD player to operate the unit (+page 10).

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

English

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CONNECTIONS

n 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.

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.

10 mm (3/8”)

Red: positive (+)

Black: negative (–)

CAUTION

•Use speakers with the 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.

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

1 Tighten the knob.

2 Insert the banana plug into the end of the corresponding terminal.

Banana plug

Subwoofer

Connecting to power source

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

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PLAYBACK

Playing a source

VOLUME

1Press the A (power) button on the front panel to turn on the unit.

You can also turn on the unit by pressing the A (power) button on the remote control of the connected network CD player if the SYSTEM jacks of the network CD player

and of the unit are connected to each other.

The unit is turned on by interlocking with the network CD player (+page 10).

2Select the input source on the network CD player and play the source.

3Rotate the VOLUME control on the front panel to adjust the volume.

You can also adjust the volume by pressing VOLUME +/– buttons on the remote control of the connected network CD player if the SYSTEM jacks of the network CD player and of the unit are connected to each other.

4When finished listening, press A (power) button on the front panel 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

1While pressing and holding A (power) on the unit, plug in the power cable to the AC outlet.

2Keep 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

Notes

•If the SYSTEM jacks of the network CD player and the unit are connected to each other, and the network CD player is turned on, the unit operates interlocking with auto power standby function of the network CD player.

English

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PLAYING BACK MUSIC STORED ON A PC (USB DAC FUNCTION) (A-U670 ONLY)

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

Rear panel

n 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.

1Access 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/

USB cable (Type B)

PC

n 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.

2Install the downloaded “Yamaha HiFi USB Driver” to your PC.

For details, refer to the Installation Guide supplied with the downloaded driver.

3When 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.

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n Playing back music stored on a PC

Check if the SYSTEM jacks of the network CD player and of the unit are connected to each other. If not connected, operation is unavailable with the network CD player and its remote control.

AUSB DAC indicator

1Connect the PC to the unit with a USB cable.

2Turn on the PC.

3Press the A (power) button on the front panel to turn on the unit.

You can also turn on the unit by pressing the A (power) button on the remote control

of the connected network CD player.

The unit is turned on by interlocking with the network CD player (+page 10).

4Press the USB button on the remote control of the connected network CD player (or rotate the INPUT knob of the connected network CD player) to select [USB DAC].

5Set 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.

		PLAYING BACK MUSIC STORED ON A PC (USB DAC FUNCTION) (A-U670 ONLY)
	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
							English
		being played. Sampling frequencies available for the unit are as follows:
		Indicator		Frequency
			×1	44.1/48 kHz
		PCM	×2	88.2/96 kHz
			×4	176.4/192 kHz
			×8	352.8/384 kHz
		DSD	×1	2.8224 MHz
			×2	5.6448 MHz

n 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.

•When the unit is not connected with a network CD player, or when a network CD player is turned off even if the SYSTEM jacks of the unit and of the network CD player are connected, the input source automatically switches to USB when the unit detects the PC connected to it. When the unit cannot recognize the connection, the input source automatically switches to ANALOG IN.

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ADJUSTING TO THE DESIRED SOUND (A-U670

ONLY)

PURE DIRECT

n 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.

Press the PURE DIRECT button on the front panel to switch the PURE DIRECT function on or off.

The PURE DIRECT indicator lights up when this function is turned on.

Notes

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

INTERLOCKING WITH A NETWORK CD PLAYER

Operation is available with the remote control of the network CD player (CD-NT670). Check if the SYSTEM jacks of the unit and the network CD player are connected to each other.

Operating the power with the remote control

Pressing the A (power) button of the remote control causes the unit to turn on or enter the standby mode by interlocking with the network CD player.

y

Even if the A (power) button on the unit is pressed, interlocking does not work. The unit and the network CD player are independently turned on or enter the standby mode.

With either the unit or the network CD player on, if you press the A(power) of the remote control, the unit will be turned on or enter the standby mode according to the status of the network CD player.

Adjusting the sound volume with the remote control

You can adjust the sound volume by pressing the VOLUME +/– buttons of the remote control.

Operating mute with the remote control

You can turn on or off mute by pressing the MUTE button on the remote control.

Selecting input (A-U670 only)

You can select USB as the input source of the unit by pressing the USB button of the remote control (or rotate the INPUT knob of the connected network CD player).

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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.

	Problem	Cause	Solution	See page
	This unit fails to turn on.	The power cable is not connected or the plug is not completely	Connect the power cable firmly.	6
		inserted.
		The protection circuitry has been activated because of a short	Check that the speaker wires are not touching each other and then turn the	6
		circuit, etc.	power of this unit back on.
		There is a problem with the internal circuitries of this unit.	Disconnect the power cable and contact the nearest authorized Yamaha	-
			dealer or service center.
		A speaker with a low impedance is connected.	Use speaker(s) with proper speaker impedance (6 Ω or higher).	6
	This unit turns off suddenly and the power	The speaker wires are touching each other or shorting out against	Connect the speaker cables properly and turn the power on again. Confirm	6
	indicator turns off.	the rear panel.	normal sound output from speakers after the unit is turned on.
		The speaker is malfunctioning.	Replace the speaker set and turn the power on again. Confirm normal	-
			sound output from speakers after the unit is turned on.
		This unit has been exposed to a strong external electric shock (such	Turn off this unit, disconnect the power cable, plug it back in after 30	-
		as lightning or strong static electricity).	seconds, then use the unit normally.
		There is a problem with the internal circuitries of this unit.	Disconnect the power cable and contact the nearest authorized Yamaha	-
			dealer or service center.
	No sound.	Headphones are connected.	Disconnect headphones when you use the speakers or subwoofer.	-
		(When headphones are connected, no sound comes from the
		speakers or subwoofer.)
		Incorrect cable connections.	Connect the stereo cable for audio units and the speaker wires properly. If	5
			the problem persists, the cables may be defective.
		Playback has been stopped on the connected component.	Turn the component on and start playback.	7
		(A-U670 only) The driver is not installed in the PC connected with	Before connecting a PC to this unit, install the driver on the PC.	8
		the unit via USB.
		The volume of the unit is set to the minimum.	Turn up the volume with the VOLUME control so that you can hear	-
			sound.
	The unit cannot be turned off.	The internal microprocessor is frozen due to an external electronic	Press the power button on the front panel of the unit for 10 seconds or	-
		shock (lightning, excessive static electricity, etc.) or decrease in the	more to restart the unit (If the problem persists, unplug the power cable
		power supply voltage.	and after about 30 seconds, then plug it back in again).

English

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TROUBLESHOOTING

	Problem	Cause	Solution	See page
	Only the speaker on one side can be	Incorrect cable connections.	Connect the cables properly. If the problem persists, the cables may be	5
	heard.		defective.
		Incorrect setting for the BALANCE control.	Set the BALANCE control to the appropriate position.	3
	There is a lack of bass and no ambience.	(When a subwoofer is connected.)	Connect the cables properly. If the problem persists, the setting for the	6
		The subwoofer is not properly connected.	subwoofer may be incorrect.
		The + and – wires are connected in reverse at the amplifier or the	Connect the speaker wires to the correct + and – phase.	6
		speakers.
		Incorrect setting for the BASS control.	Set the BASS control to the appropriate position.	3
	A “humming” sound can be heard.	Incorrect cable connections.	Connect the audio plugs firmly. If the problem persists, the cables may be	5
			defective.
	The sound level is low.	The volume of the unit is set to a low level.	Turn up the volume with the VOLUME control so that you can hear	7
			sound.
		(A-U670 only) The volume of the PC connected with the unit via	Turn up the volume of the PC.	-
		USB is set to a low level.
	(A-U670 only) The BASS, TREBLE, and	The PURE DIRECT function is turned on.	Turn off the PURE DIRECT function.	10
	BALANCE controls does not work.
	(A-U670 only) The connected PC does not	The operating system of the PC is not supported.	Use a PC with an operation-guaranteed operating system.	8
	recognize this unit.
		Improper USB cable connection.	Connect the USB cable properly.	8
		The output of the PC or application is muted.	Cancel the sound muting of the PC or application.	-
	(A-U670 only) Noisy playback.	Another application is launched on the PC while a music file is	Do not launch other applications during playback.
		being played.		-
		(If another application is launched while a music file is being
		played, sound may be momentarily lost or noise may be generated.)
	(A-U670 only) The sound is interrupted.	Another application is launched on the PC while a music file is	Do not launch other applications during playback.
		being played.		-
		(If another application is launched while a music file is being
		played, sound may be momentarily lost or noise may be generated.)
	(A-U670 only) Music files cannot be	The music data are not properly reproduced, because this unit is	Connect this unit to the PC and set the input of the unit to USB in	8
	played.	connected to the PC or the input of this unit is switched to USB	advance. Then launch the music application and start playback.
		while the music application is running on the PC.
		The dedicated “Yamaha HiFi USB Driver” has not been installed	Install the “Yamaha HiFi USB Driver” again by following the correct	8
		correctly.	procedure.
		The audio output destination of the computer is not set to “Yamaha	Set the audio output destination of the computer to “Yamaha A-U670/A-	9
		A-U670/A-U671.”	U671.”

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