Denon AH-GC25NC User manual

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AH-GC25NC
Noise Cancelling Over-Ear Headphone
Owner’s Manual
Contents Preparation Connections Operation Troubleshooting Appendix
1

Preparation
Unpacking 3
Features 4
Sound quality 4
Functions 4
Part names and functions 5
Charging / Battery status 6
Wearing 7
Connections
Connecting the audio cable 8
Operation
Decreasing outside noise (Noise cancell function) 9
Listening to surrounding sound (ambient sound mix function) 11
Auto standby function 12
Information 13
Storage in the carrying case 13
Auto dimmer function 13
Troubleshooting
Troubleshooting 14
Power does not turn on / power is turning off automatically 14
The device cannot be charged 15
No sound comes out 15
Sound is distorted, noisy, or cuts in and out 15
Appendix
Precautions for Use 16
Disposal of these headphones 16
Specifications 17
Contents Preparation Connections Operation Troubleshooting Appendix
2

Thank you for purchasing this product.
To ensure proper operation, please read this Owner’s Manual carefully before using the product.
Unpacking
Check that all of these are present before using this device.
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DENON
Quick Start Guide
USB cable
(Micro-B connector,
approximately 1.2 m)
Carrying case Accessory pouch
Audio cable
(approx. 1.3 m)
Safety Instructions Audio cable (approx. 1.3 m)
with remote control mic
Contents Preparation Connections Operation Troubleshooting Appendix
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Features
Sound quality
0Equipped with a 40 mm free edge driver for the ideal piston
motion. This enables natural, delicate audio to be enjoyed with
minimal distortion.
Functions
0When the noise cancelling function is turned on, you can hear
clear sound even if you are in a noisy location such as inside a
train. Equipped with three noise cancel modes with different
effects for use as needed for the surrounding environment.
Contents Preparation Connections Operation Troubleshooting Appendix
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Part names and functions
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NCMODE
t
e
q w w q
iuy
RL
r
AL/R Indicators
BNoise cancelling microphones
CCharging LED
DTap sensor panel
Lightly tap with your finger to toggle the ambient sound mix function on
or off. (v p. 11)
ENC (Noise Cancel) LED
FControl switch (NC MODE)
0Indicates the remaining battery power. (v p. 7)
0Sets the noise cancelling function. (v p. 9)
0Turns the power off. (v p. 10)
0Sets auto standby function. (v p. 12)
GStereo mini jack (2.5 mm)
Connects to playback devices using the included audio cable.
(v p. 8)
HUSB port (Micro-B)
Contents Preparation Connections Operation Troubleshooting Appendix
5

Charging / Battery status
Connect the headphones to a computer or USB AC adapter (sold
separately) using the supplied dedicated USB cable to charge the battery.
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PC
or USB cable (supplied)
USB AC
adapter
The charging status can be checked from the charging LED on headphones.
Charging status Color of charging LED
Charging Red
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Fully charged Green
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0When using the headphones for the first time after purchase or when the
remaining power of the rechargeable battery is low, charge the battery.
0You can connect the headphones to a device using the supplied audio cable to
enjoy listening to music even if the battery is drained. (v p. 8)
0The noise cancelling function can be used for approximately 30 hours when the
battery is fully charged.
0It takes approximately 2 hours to fully charge the rechargeable battery from the
state of no remaining battery power.
0The usable time of the headphones differs depending on the temperature of the
environment in which they are used and method of use.
NOTE
0When connecting the USB cable to the USB port, be sure to match the cable
connector with the shape of the socket. Forcing the connector into the socket will
cause damage.
0The rating of the charging output should be DC 5 V, 2.4 A or less.
Contents Preparation Connections Operation Troubleshooting Appendix
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oChecking the remaining battery power
The remaining power of the rechargeable battery can be checked from
the number of alert sounds or the number of times the charging LED
flashes. Slide the NC MODE switch to the left and hold it there for
approximately 2 seconds.
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2sec. R
Number of alert
sounds
Number of times the
charging LED flashes
Remaining time of
rechargeable battery
Three times Three times Approx. 30 hours
Twice Twice Approx. 10 hours
Once Once Less than 1 hours
0When the remaining power of the rechargeable battery is running low, the charging
LED flashes at approximately 3-second intervals together with an alert sound.
Wearing
Adjust the slider to the preferred length.
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R
L
0In order to hear the best quality sound, be sure that the ear pads correctly cover
both the left and right ears. If there are gaps between your ears and the
headphone ear pads, sound will leak and the bass level and effectiveness of the
noise cancelling function will be reduced.
NOTE
0Be careful not to trap your fingers, etc. in the moving parts.
0Do not pull the slider too forcefully.
Contents Preparation Connections Operation Troubleshooting Appendix
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Connecting the audio cable
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Audio cable (supplied)
0Use the cable to connect and listen to music from your device even when the
rechargeable battery is exhausted. In this case, the noise cancelling function will
be unavailable.
oUsing the audio cable with remote control mic
An audio cable with a remote control mic as well as an audio cable are
included with these headphones. Use the audio cable with the remote
control mic to connect with remote control-compatible playback
devices to play and pause music, as well as receive, make and hang
up phone calls.
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Back
Button
Microphone
Audio playback/pause
Press the remote control button.
Answer / hang up phone call
Press the remote control button when a call is incoming or while on a
call.
0Enabled remote control operations may vary depending on the device connected,
and mic operations may not work correctly.
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Decreasing outside noise (Noise cancell function)
Turn the noise cancelling function on while listening to music to reduce
surrounding noise and better focus on your music. These headphones are
equipped with three noise cancelling modes that can be set as needed for
the surrounding environment. Try using the noise cancelling function when
you aren’t listening to music to help yourself concentrate in quiet
environments.
oTurning the noise cancelling function on
1Slide the NC MODE switch to the center.
The NC LED blinks orange and the noise cancelling function turns
on.
.
R
Contents Preparation Connections Operation Troubleshooting Appendix
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oSwitching the noise cancelling mode
1Slide the NC MODE switch to the left while the noise
cancelling function is on.
0The setting changes each time you slide the switch to the left.
Setting LED display
(repeats)
Number of
alert
sounds
Description
Airplane
mode Blinks once Once The optimal mode to use when on a plane.
City
mode Blinks twice Twice
The optimal mode to use
when on trains or buses, or
when in an urban area.
Office
mode
Blinks three
times Three times The optimal mode to use in relatively quiet rooms.
oTurning the noise cancelling function and
power off
1Slide the NC MODE switch to the right.
The NC LED turns off and the noise cancelling function and power
turn off.
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R
0A small amount of power is consumed even when the power is off.
Contents Preparation Connections Operation Troubleshooting Appendix
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Listening to surrounding sound (ambient sound mix function)
Turn on the ambient sound mix function while listening to music to use the
mic to mix surrounding sound into the music you are listening to. Enjoying
music while also being able to hear surrounding sound is useful when you
are listening to an in-flight announcement or talking with your headphones
on.
oTurning the ambient sound mix function on
1Tap the center of the tap sensor panel twice.
A warning sounds 4 times, the NC LED lights orange and the
ambient sound mix function turns on.
.
R
×2
0Ambient sound is not mixed into the low range that is not affected by
announcements and conversation.
oTurning the ambient sound mix function off
1Tap the center of the tap sensor panel twice while the
ambient sound mix function is on.
An alert sounds, the NC LED starts blinking again, and the ambient
sound mix function turns off.
0Depending on the noise cancelling mode setting, the alert will
sound once (Airplane mode), twice (City mode), or three times
(Office mode).
.
R
×2
0Turn off the ambient sound mix function by sliding the NC MODE switch to the left.
Contents Preparation Connections Operation Troubleshooting Appendix
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Auto standby function
To keep the battery from draining, the headphones automatically turn off
after no operations are performed or they are stationary* for at least 10
minutes. The default setting for the auto standby function is “On”.
zThe headphones are stationary when they have been placed on a surface such
as a desk and are completely motionless.
oTurning the auto standby function on and off
1Slide the NC MODE switch to the left and hold for
approximately 5 seconds.
An alert sounds and the auto standby switches between on and off.
0When the auto standby function turns on: alert sound
0When the auto standby function turns off: alert sound
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5sec. R
Contents Preparation Connections Operation Troubleshooting Appendix
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Information
Storage in the carrying case
Remove the cable from the headphones and store them in the included
carrying case as shown below.
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Extend
NOTE
0Do not force them into the carrying case. Doing so may damage the headphones.
Auto dimmer function
The auto dimmer function changes the LED brightness when the
headphones are tilted past the defined angle. When the headphones are
on, the LED dims so that the brightness does not disturb people around
you. The brightness increases if the headphones are laid horizontally
when charging, etc.
Contents Preparation Connections Operation Troubleshooting Appendix
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Troubleshooting
First, check the following.
1. Are all of the connections correct?
2. Were the instructions in the manual followed correctly?
3. Is the connected device being operated correctly?
If the headphones do not operate properly, check the corresponding issue here.
If the issue is not covered here, there may be a malfunction. Contact the store where you purchased the headphones. If the staff at the store where you
purchased the headphones also do not know how to resolve the issue, contact the Denon Customer Service Center or your nearest Repairs Center.
Power does not turn on / power is turning off automatically
Power does not turn on.
0When the rechargeable battery has no power remaining, connect the headphones to an AC adapter or computer using the supplied USB cable to
charge the battery. (v p. 6)
Power is turning off automatically.
0The auto standby function has turned on. In auto standby mode, the headphones automatically turn off after no operations are performed or they are
stationary (when they have been placed on a surface such as a desk and are completely motionless) for at least 10 minutes. To turn off auto standby
mode, slide the NC MODE switch to the left and hold for approximately 5 seconds while auto standby mode is on. (v p. 12)
Contents Preparation Connections Operation Troubleshooting Appendix
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The device cannot be charged
The headphones cannot be charged.
0Check whether the power plug is correctly inserted into the power outlet. (v p. 6)
0Make sure the supplied USB cable is inserted correctly into the headphones. (v p. 6)
0If the headphones are connected to the computer via the USB port, check that the computer is powered on.
No sound comes out
No sound comes out.
0Make sure the connected device is on.
0Adjust the volume of the connected device to a suitable level.
0Make sure the included audio cable is properly connected. (v p. 8)
Sound is distorted, noisy, or cuts in and out
Sound is distorted, noisy, or cuts in and out.
0Adjust the volume of the connected device to a suitable level.
Contents Preparation Connections Operation Troubleshooting Appendix
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Precautions for Use
0Be sure to read the Owner’s Manual of the device that you want to
connect.
0Check the volume settings when using the headphones on public
transport or in public places and make sure you do not disturb people
around you.
Disposal of these headphones
The rechargeable battery built into these headphones can be recycled.
Contact the Denon Customer Service Center for details on disposing of
these headphones.
Contents Preparation Connections Operation Troubleshooting Appendix
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Specifications
Type: Dynamic type
Drive units: φ40 mm
Impedance: 16 Ω/ohms
Sound pressure sensitivity：98 dB/mW
Maximum input：1,000 mW
Playback frequency: 5 – 50,000 Hz
Continuous playback time (noise cancellation
function on): Approx. 30 hours
Operating temperature range: 5 ℃ - 40 ℃
Power supply: DC 3.7 V (internal lithium polymer rechargeable battery)
Weight: 287 g
zFor purposes of improvement, specifications and design are subject to change without notice.
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