Yamaha A-670, A-U670 Owners Manual
Integrated Amplifier / Amplificateur Intégré
OWNER’S MANUAL
MODE D’EMPLOI
MANUAL DE INSTRUCCIONES
English Français Español
ULV
IMPORTANT SAFETY INSTRUCTIONS
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.
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.
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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IMPORTANT SAFETY INSTRUCTIONS
FCC INFORMATION (for US customers)
1 IMPORTANT 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.
2 IMPORTANT: 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.
3 NOTE: 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.
COMPLIANCE INFORMATION STATEMENT
Responsible Party: Yamaha Corporation of America A/V Division
Address: 6600 Orangethorpe Avenue, Buena Park, CA 90620
Telephone: 714-522-9011
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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IMPORTANT SAFETY INSTRUCTIONS
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.)
*Except for CD-NT670
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 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.
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 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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INTRODUCTION
CONTENTS
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
INTRODUCTION
What the unit can do
u 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.
u 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.
u The USB DAC function allows you to play back music stored on a PC (+page 8).(A-
U670 only)
u Enjoy pure, high fidelity sound by using the PURE DIRECT function (+page 10).(A-
U670 only)
u Boost 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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Front panel
NAMES AND FUNCTIONS OF THE PARTS
NAMES AND FUNCTIONS OF THE PARTS
English
(A-U670)
1 A (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.
USB DAC indicators (A-U670 only)
8
Lights up when audio signals are input to the USB DAC jack of this unit (+page 9).
9
PURE 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)
Used to connect a PC (+page 5).
2
ANALOG IN jacks
Used to connect a network CD player (+page 5).
3
SYSTEM jack
Used to connect a network CD player (+page 5).
4
SUBWOOFER jack
Used to connect a subwoofer with built-in amplifier (+page 5).
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SPEAKERS terminals
5
Used to connect speakers (+page 5).
6
Power cable
CONNECTIONS
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.
10 m m
(3/8”)
Red: positive (+)
Black: negative (–)
CAUTION
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.
• 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.
n Using 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
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Subwoofer
Connecting to power source
After all the connections are complete, plug in the power cable to the AC outlet.
Playing a source
VOLUME
1 Press the A (power) button on the front panel to turn on the unit.
You can also turn on the unit by pressing the
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).
A (power) button on the remote control
PLAYBACK
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
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
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.
PLAYBACK
English
A (power) on the unit, plug in the power cable to the
AC outlet.
2 Select the input source on the network CD player and play the source.
3 Rotate 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.
4 When finished listening, press A (power) button on the front panel to
set the unit to standby mode.
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PLAYING BACK MUSIC STORED ON A PC (USB DAC FUNCTION) (A-U670 ONLY)
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
USB cable (Type B)
PC
n Supported operating systems
The USB connection is available for PCs with the following operating systems:
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.
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 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.
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.
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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.
A
USB DAC
indicator
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
being played. Sampling frequencies available for the unit are as follows:
Indicator Frequency
×1 44.1/48 kHz
×2 88.2/96 kHz
PCM
×4 176.4/192 kHz
×8 352.8/384 kHz
×1 2.8224 MHz
DSD
×2 5.6448 MHz
English
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 to turn on the unit.
You can also turn on the unit by pressing the
of the connected network CD player.
The unit is turned on by interlocking with the network CD player (+page 10).
A (power) button on the remote control
4 Press 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].
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.
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)
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
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
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.
A (power) button of the remote control causes the unit to turn on or enter the
A (power) of the remote control,
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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).
TROUBLESHOOTING
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
This unit turns off suddenly and the power
indicator turns off.
No sound. Headphones are connected.
The unit cannot be turned off. The internal microprocessor is frozen due to an external electronic
inserted.
The protection circuitry has been activated because of a short
circuit, etc.
There is a problem with the internal circuitries of this unit. Disconnect the power cable and contact the nearest authorized Yamaha
A speaker with a low impedance is connected. Use speaker(s) with proper speaker impedance (6 Ω or higher).
The speaker wires are touching each other or shorting out against
the rear panel.
The speaker is malfunctioning. Replace the speaker set and turn the power on again. Confirm normal
This unit has been exposed to a strong external electric shock (such
as lightning or strong static electricity).
There is a problem with the internal circuitries of this unit. Disconnect the power cable and contact the nearest authorized Yamaha
(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
Playback has been stopped on the connected component. Turn the component on and start playback.
(A-U670 only) The driver is not installed in the PC connected with
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
shock (lightning, excessive static electricity, etc.) or decrease in the
power supply voltage.
Connect the power cable firmly.
Check that the speaker wires are not touching each other and then turn the
power of this unit back on.
dealer or service center.
Connect the speaker cables properly and turn the power on again. Confirm
normal sound output from speakers after the unit is turned on.
sound output from speakers after the unit is turned on.
Turn off this unit, disconnect the power cable, plug it back in after 30
seconds, then use the unit normally.
dealer or service center.
Disconnect headphones when you use the speakers or subwoofer.
the problem persists, the cables may be defective.
Before connecting a PC to this unit, install the driver on the PC.
sound.
Press the power button on the front panel of the unit for 10 seconds or
more to restart the unit (If the problem persists, unplug the power cable
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
heard.
There is a lack of bass and no ambience. (When a subwoofer is connected.)
A “humming” sound can be heard. Incorrect cable connections. Connect the audio plugs firmly. If the problem persists, the cables may be
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
(A-U670 only) The BASS, TREBLE, and
BALANCE controls does not work.
(A-U670 only) The connected PC does not
recognize this unit.
(A-U670 only) Noisy playback. Another application is launched on the PC while a music file is
(A-U670 only) The sound is interrupted. Another application is launched on the PC while a music file is
(A-U670 only) Music files cannot be
played.
Incorrect cable connections. Connect the cables properly. If the problem persists, the cables may be
Incorrect setting for the BALANCE control. Set the BALANCE control to the appropriate position.
The subwoofer is not properly connected.
The + and – wires are connected in reverse at the amplifier or the
speakers.
Incorrect setting for the BASS control. Set the BASS control to the appropriate position.
(A-U670 only) The volume of the PC connected with the unit via
USB is set to a low level.
The PURE DIRECT function is turned on. Turn off the PURE DIRECT function.
The operating system of the PC is not supported. Use a PC with an operation-guaranteed operating system.
Improper USB cable connection. Connect the USB cable properly.
The output of the PC or application is muted. Cancel the sound muting of the PC or application.
being played.
(If another application is launched while a music file is being
played, sound may be momentarily lost or noise may be generated.)
being played.
(If another application is launched while a music file is being
played, sound may be momentarily lost or noise may be generated.)
The music data are not properly reproduced, because this unit is
connected to the PC or the input of this unit is switched to USB
while the music application is running on the PC.
The dedicated “Yamaha HiFi USB Driver” has not been installed
correctly.
The audio output destination of the computer is not set to “Yamaha
A-U670/A-U671.”
defective.
Connect the cables properly. If the problem persists, the setting for the
subwoofer may be incorrect.
Connect the speaker wires to the correct + and – phase.
defective.
sound.
Turn up the volume of the PC.
Do not launch other applications during playback.
Do not launch other applications during playback.
Connect this unit to the PC and set the input of the unit to USB in
advance. Then launch the music application and start playback.
Install the “Yamaha HiFi USB Driver” again by following the correct
procedure.
Set the audio output destination of the computer to “Yamaha A-U670/AU671.”
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