PS Audio GCHA Quick start guide

4826 Sterling Drive, Boulder, CO 80301
PH: 720.406.8946 [email protected] www.psaudio.com Introduction i
®Owner’s Reference
©2005 PS Audio International Inc. All rights reserved.
Owner’s Reference GCHA Headphone Amplifier
Instructions for use
GCHA Headphone Amplifier
Document 15-044-21-1

Owner’s Reference GCHA Headphone Amplifier
4826 Sterling Drive, Boulder, CO 80301
PH: 720.406.8946 [email protected] www.psaudio.com Introduction ii
®
©2005 PS Audio International Inc. All rights reserved.
Introduction
Read these instructions
Heed all warnings
Follow all instructions
WARNING. TO REDUCE THE RISK OF FIRE OR ELECTRICAL SHOCK, DO NOT EXPOSE THIS
APPARATUS TO RAIN OR MOISTURE.
Clean only with a dry cloth.
Do not place flammable material on top of or beneath the component.
All PS Audio components require adequate ventilation at all times during operation. Rack
mounting is acceptable where appropriate.
Do not remove or bypass the ground pin on the end of the AC cord. This may cause RFI (radio
frequency interference) to be induced into your playback setup and is potentially unsafe. All PS
products ship with a grounding type plug. If the provided plug does not fit into your outlet, consult
an electrician for replacement of the obsolete outlet.
Protect the power cord from being walked on or pinched particularly at plugs, convenience
receptacles, and the point where they exit from the apparatus. Unplug this apparatus during
lightning storms or when unused for long periods of time.
When making connections to this or any other component, make sure all components are off. Turn
off all systems’ power before connecting the PS Audio component to any other component. Make
sure all cable terminations are of the highest quality.
There are no fuses inside this product.
THERE ARE NO USER-SERVICEABLE PARTS INSIDE ANY PS AUDIO PRODUCT. REFER ALL
SERVICING TO QUALIFIED SERVICE PERSONNEL
Please contact your authorized dealer, distributor, or PS Audio if you have any questions not
addressed in this reference manual.
This product is manufactured in the United States of America. PS Audio® is a registered trademark of PS Audio International Inc., and is
restricted for use by PS Audio International, Inc., its subsidiaries, and authorized agents.
Important Safety
Instructions

4826 Sterling Drive, Boulder, CO 80301
PH: 720.406.8946 [email protected] www.psaudio.com
®Table Of Contents
Table Of Contens iii
©2005 PS Audio International Inc. All rights reserved.
Introduction
Getting Started
Quick Start Guide
Questions and
Answers
Troubleshooting
Warranty
Service
Owner’s Reference GCHA Headphone Amplifier
IV
1
2 - 3
4 - 5
6 - 7
8 - 9
10 - 11

Owner’s Reference GCHA Headphone Amplifier
4826 Sterling Drive, Boulder, CO 80301
PH: 720.406.8946 [email protected] www.psaudio.com Introduction iv
®
©2005 PS Audio International Inc. All rights reserved.
Introduction
Thank you for your purchase of the PS Audio GCHA Headphone Amplifier.
The GCHA is a high-end headphone amplifier designed for audiophile listening. It is based on PS
Audio’s unique Gain Cell Technology.
The GCHA contains a Gain Cell’s preamplifier stage and a Class A biased output stage. The GCHA can
accept audio signals from any analog source or digital audio from your USB-compliant computer.
A unique feature of the GCHA is the volume control itself: which does not attenuate the audio signal
in the tradional manner, rather, the level of the GCHA is adjusted by controling the gain of amplifiers
inside the GCHA.
In a traditional headphone amplifier, an audio signal is presented to the amplifier at full signal level.
The headphone amplifier then attenuates, or reduces, that input signal to reach the desired listening
level with headphones. While this conventional method of controlling the volume is an acceptable
practice, it does have drawbacks: the attenuators cause degradation of the audio signal. The GCHA
solves this problem by use of the PS Gain Cell technology. Gain Cells have adjustable gain and need
no attenuation of the input signal to achieve desired listening levels. Instead, the front panel volume
control is a gain adjustment, rather than an attenuator. The removal of any attenuators in the signal
path has a sonic advantage over conventional technologies.
You should expect unrivaled sonic qualities, with low noise, high performance audio being delivered
to your headphones.
What will it do?
What you can
expect
No attenuators
inside

4826 Sterling Drive, Boulder, CO 80301
PH: 720.406.8946 [email protected] www.psaudio.com
®Getting Started
Getting Started 1
©2005 PS Audio International Inc. All rights reserved.
Owner’s Reference GCHA Headphone Amplifier
Once your new GCHA is unpacked, you’ll need to find a convenient place to set it.
There are several ways to mount the GCHA: on a shelf next to the preamplifier, CD or DVD player, or
on a desk or table near your computer.
The GCHA can benefit from aftermarket isolation devices such as cones, spikes and Sorbothane
pads.
Once you have chosen the location for the GCHA you can use the supplied AC power cord to connect
it to the AC wall receptacle to get started, or you can use an aftermarket power cord and receptacle.
We strongly recommend the use of a PS Audio xStream Power™ AC cable and a PS Power Port™
AC receptacle to feed the GCHA power. While the supplied power cable is adequate for the task of
setup it is not going to provide the best performance. Choosing any xStream Power cable will make
a significant performance improvement over the stock power cable. An xStream Plus would be our
recommendation.
It is further recommended that you power the GCHA with a PS Audio Power Plant if possible, or a
UPC-200 or Ultimate Outlet if not. Power conditioning with the appropriate equipment will further the
benefits of the GCHA headphone amplifier.
Connections from the analog audio source should be through high quality audio interconnects with
proper shielding. Using inexpensive, off-the-shelf audio interconnects should be avoided if you expect
the full benefits of this high-end audio amplifier to be available. We would recommend using audio
interconnects less than 3 meters in length. PS designs and sells a line of reference quality audio
interconnects that are highly recommended. Please see your PS dealer for details.
Connections from the computer to the USB input of the GCHA should use a high quality, properly
shielded USB-2.0 cable. Each GCHA has a supplied and approved USB cable included.
Isolation
Power Cables
Location
Use a Power
Plant
Audio
interconnects
USB cable

4826 Sterling Drive, Boulder, CO 80301
PH: 720.406.8946 [email protected] www.psaudio.com Quick Start Guide 2
®Quick Start Guide
©2005 PS Audio International Inc. All rights reserved.
Owner’s Reference GCHA Headphone Amplifier
Once you have decided on the location and chosen the appropriate power, audio and USB cables,
you are ready to install the GCHA into your system or your desktop.
Plug the GCHA into the AC power source using the AC power
cable you selected. It is advisable to use as short a power cable
as possible to the GCHA.
Once the GCHA has been connected to the power source, make
sure that power source is energized and providing AC power to
the GCHA.
If you are using an AC wall receptacle to power the GCHA, make
sure the AC receptacle is not a switched outlet. Switched outlets are those outlets that can be turned
on/off with the wall switch. It is advisable to leave the GCHA powered at all times.
Once the GCHA has been powered, turn the front panel gain control clockwise to turn the unit “on”.
Once it is “on”, note the blue light on the front panel of the GCHA, under the logo, should be lit. Your
GCHA Headphone Amplifier should now be ready to connect.
Insert the GCHA into the system by first connecting the GCHA to the source. The choices are an
analog audio source or a digital audio source from a computer, or both. Analog audio sources would
include the RCA single ended output of a CD player, DVD player, tuner, phono preamplifier, or outputs
of a preamplifier. Digital sources would be any USB style output from a computer.
If you are using analog sources, you may connect directly to the analog input of the GCHA. If you
are using a computer, plug in the USB cable at this time. If you are using both, plug both analog and
digital in at this time.
Turn the front panel Gain Control (volume control) fully counter clockwise to mute the outputs before
plugging headphones into the GCHA. Note: this switch only controls the output and does not turn the
power to the unit on or off.
Plug in your headphones to the front panel, making sure the front panel level control is turned down.
The headphones should be 16 Ohms or higher impedance to work properly.
If you are using a computer to play music from, please note that the GCHA is designed to work
seamlessly and automatically with Windows XP®. The GCHA
should also work with other versions of Windows such as Windows
2000® and Apple Macintosh computers®. No special drivers are
needed or included.
With your computer on and the GCHA plugged in, plug the USB
cable into your computer. Windows XP will automatically recognize
the GCHA after a short delay and will automatically install the driver.
No driver discs are necessary.
Choose analog or
digital or both
If you are using a
computer
Make sure the
GCHA is on
Avoid switched
outlets
Turn the Gain
Control off
Plug the
headphones in
Connect to an AC
power source

4826 Sterling Drive, Boulder, CO 80301
PH: 720.406.8946 [email protected] www.psaudio.com Quick Start Guide 3
®Quick Start Guide
©2005 PS Audio International Inc. All rights reserved.
Owner’s Reference GCHA Headphone Amplifier
It should not be necessary to reboot your computer once the GCHA is connected, however, first time
users of the GCHA may need to reboot or otherwise instruct the computer to install the new USB
device if the unit does not install automatically when plugged in.
Once the system recognizes the GCHA as the USB sound
device, it will be necessary to make sure the computer’s
internal volume control is turned up all the way. On most
Windows XP systems, look for the small speaker icon in the
lower right hand side of the computer’s screen in an area
known as the System Tray. If the icon is not visible, follow
these instructions: go to Start -> Settings -> Control Panel.
Open the Windows Control panel.
From the Control Panel, choose Sounds, Speech and
Audio Devices. Open this dialog box and adjust the system
volume all the way up. If you do not adjust the system
volume up, the GCHA may not have enough volume to
satisfy your listening requirements. WAV and CD should
be up as well.
You may have to tell the computer to make the GCHA the
default USB device, althought typically this will happen
automatically. The GCHA is recognized by the computer
as USB Speakers or USB Composite Device. Go to Start
-> Settings -> Control Panel. Open the Windows Control
panel. From the Control Panel, choose Sounds, Speech
and Audio Devices -> Choose Sounds and Audio Devices
-> Choose Audio -> Choose USB Speakers as the default
device.
At this point, you can place a CD or DVD (if your computer
has a CD or DVD drive built in) into your computer’s disc drive
and it should play automatically through the GCHA once you
turn the volume control on the GCHA to a reasonable level.
You can also play music recorded on your computer’s hard
drive, using a program like Windows Media Player to select
the music, or stream live sound via Real Time Player.
The GCHA will automatically choose the digital USB input if
there is a signal present. Once the Windows Media Player
or the CD or DVD player, built into the computer, is stopped,
the GCHA should switch back to the analog audio inputs.
At this point you should be ready to enjoy the benefits of high
end audio played through the GCHA Headphone Amplifier.
Make the GCHA
the default device
Computer system
volume all the
way up
Input Selection

4826 Sterling Drive, Boulder, CO 80301
PH: 720.406.8946 [email protected] www.psaudio.com Questions and Answers 4
®Questions And Answers
©2005 PS Audio International Inc. All rights reserved.
Owner’s Reference GCHA Headphone Amplifier
The GCHA is best left powered on at all times. The power consumed is negligible and keeping it
powered on will make sure the internal AC capacitors stay charged and the amplifier and Gain Cells
sound their best whenever you are ready to listen to music.
There is no harm in leaving the unit on at all times as the lifespan of the GCHA will be unaffected.
There is a user replaceable internal fuse inside the GCHA. However, this fuse should not be replaced
without first consulting the factory service center for advice. It would be unusual for this fuse to blow
and may indicate something is wrong with the unit.
The GCHA will power any headphone made with 16 Ohm or higher impedance. Most headphones
have considerably higher impedance than the minimum 16 Ohm.
Note that listening to headphones at extremely loud listening levels may damage your hearing. Enjoy
your music, enjoy the superb dynamics of this high-end piece of equipment, but protect your ears.
Hearing damage from overly loud music is typically irreversible.
The GCHA will automatically switch back to the analog inputs when no digital signal is present.
This means once the Windows Media
Player or the CD or DVD player, built into
the computer, is stopped, the GCHA will
switch back to the analog audio inputs.
Placement of the GCHA is not critical for
most components. In most cases, it may
be placed as close to or as far away from
the system or the computer, as need be.
However, it may not be advisable to place
the GCHA too close to a CRT computer
monitor. The large transformer inside the
GCHA may cause some slight color shift
in CRT monitors if placed too close. We
would recommend keeping the GCHA at
least one to two feet away from any CRT
monitor. LCD screens are fine.
Hum may also be an issue with the GCHA if placed too close to a sensitive piece of equipment
such as a phono preamplifier or turntable. The GCHA has an exceptionally large power transformer
inside. This transformer can generate a fairly large magnetic field which can induce hum into sensitive
equipment in close proximity.
Isolation through the use of spikes, cones or Sorbothane feet is recommended for the GCHA if
space and budget allows. Isolation of any piece of high-end stereo and theater equipment is always
recommended wherever practical.
Should the unit
be on all the
time?
Are there any
internal fuses?
Caution listening
too loudly
Placement?
Isolation?
Input Selection
Which
headphones?

4826 Sterling Drive, Boulder, CO 80301
PH: 720.406.8946 [email protected] www.psaudio.com Questions and Answers 5
®Questions And Answers
©2005 PS Audio International Inc. All rights reserved.
Owner’s Reference GCHA Headphone Amplifier
The GCHA is specific to your country’s voltage. Do not use the GCHA on a voltage higher than it is
rated for. For instance, do not take a 120 volt rated GCHA and attempt to use it in a 220 volt country.
Failure to observe this cautionary note will void your warranty. If you need to operate the GCHA at a
voltage other than the voltage it was designed for, contact your dealer, distributor or the factory for
help.
The GCHA should generate a bit of heat, especially on the bottom of the unit. This is normal. The
GCHA will remain warm to the trouch even when the front panel Gain Control is in the off position.
We do not recommend removing power to the GCHA. We recommend leaving the GCHA powered
at all times.
The front panel gain control on the GCHA also serves as the on/off switch. Turning the gain control fully
counter clockwise you will feel a “click”. The front panel blue LED should shut off and the GCHA output
will be muted. This does not remove power from the GCHA and it will remain on. We recommend
leaving the GCHA powered up at all times.
Turning the unit
on/off
What voltages
can I run GCHA
on?

4826 Sterling Drive, Boulder, CO 80301
PH: 720.406.8946 [email protected] www.psaudio.com Troubleshooting 6
®Troubleshooting
©2005 PS Audio International Inc. All rights reserved.
Owner’s Reference GCHA Headphone Amplifier
If the GCHA Headphone Amplifier does not power up there are several possibilities: the unit is not
getting AC power or the front panel gain control is in the off position.
If you suspect the unit is not getting power, test the receptacle feeding the GCHA power to see if
there is power. The easiest way to do this is by using a lamp that you have previously verified works.
Regardless of the receptacle’s type, that of a wall receptacle, a power conditioner, Power Plant or AC
source of any kind, plug the lamp into the receptacle and verify there is AC power.
Another possibility is the line cord. Swap line cords and make sure the unit has power. Sometimes
the line cord feeding the GCHA is not functioning properly.
If the GCHA loses power mysteriously, chances are pretty good that you have the GCHA connected
to a switched receptacle on the wall or the
back of a receiver or a power conditioner.
Switched AC receptacles are those
receptacles that are controlled by a wall
mounted power switch and are typically
intended to be used to power on/off a lamp
in the room. Most times these receptacles
are unmarked and inadvertent switching on
or off of the power switch can cause a lot of
headaches trying to track down the reason
your new equipment does not power up.
Most switched receptacles are on the top
AC receptacle in a two gang box. Always
use the lower receptacle on the wall port if
you are unsure.
If you have determined the GCHA does
power on, after performing the above tests, turn to the service section of this manual for details on
receiving service.
If you are having problems connecting your computer to the GCHA, there are several possibilities:
• The computer does not recognize the USB device
• The computer recognizes multiple USB device possibilities
• The computer uses Windows 98 or older operating software
• The volume control in the computer is turned down
If the computer does not recognize the GCHA as a USB device, leave the GCHA plugged in to its
power, leave the USB cable connected to the computer and reboot the computer. The computer
should open the Found New Hardware dialog and install the USB device. If it does not recognize
there is new hardware, then either it has been installed (therefore the hardware is no longer “new”)
The GCHA will
not power up
No AC in
Check the line
cord
Switched outlets
Problems with
computers
Does not
recognize the
USB

4826 Sterling Drive, Boulder, CO 80301
PH: 720.406.8946 [email protected] www.psaudio.com Troubleshooting 7
®Troubleshooting
©2005 PS Audio International Inc. All rights reserved.
Owner’s Reference GCHA Headphone Amplifier
or you need to manually install the new hardware. To manually install the hardware on a Windows
XP or Windows 2000 operating system, right click My Computer -> Choose Properties -> Choose
Hardware -> Choose Device Manager -> Choose Universal Serial Bus Controllers (USB) -> Choose
USB Composite Device -> Right Click on the device -> Choose Install or, if it is already installed,
choose Update Driver. Make sure the GCHA has power.
If the device is properly installed yet no sound is coming through
the GCHA, you may have to tell the computer to make the GCHA
the default USB device. The GCHA is known to the computer as
USB Speakers. Go to Start -> Settings -> Control Panel. Open the
Windows Control panel. Or, from the My Computer Icon, double
click and open the Control Panel.
From the Control Panel, choose Sounds, Speech and Audio
Devices -> Choose Sounds and Audio Devices -> Choose Audio
-> Choose USB Speakers as the default device.
If your computer is running an older version of the Window’s
operating system, the GCHA may not be compatible with the unit.
The GCHA should work on any computer operating system that
supports USB devices. However, it was designed specifically to work with later versions of Windows
such as Windows 2000 and Windows XP. Macintosh computers have been USB compliant for many
years and should not pose a problem connecting the GCHA.
If the GCHA is properly connected to the computer and being recognized by the computer, yet no
sound comes out when you play a disc in the computer’s disc drive, check to make sure the volume
control on the computer is turned up to 100%. To check, Go to Start -> Settings -> Control Panel.
Open the Windows Control panel.
From the Control Panel, choose Sounds, Speech and Audio Devices. Open this dialog box and adjust
the system volume all the way up. If you do not adjust the system volume up, the GCHA may not have
enough volume to satisfy your listening requirements.
If the GCHA will not select and play the analog audio inputs, check to make sure the USB music is
no longer playing. The GCHA will default to the USB connection if both the analog inputs and the
USB inputs are connected and playing. To test, remove the USB input and the GCHA should switch
automatically to the analog audio inputs. If it does not, leave the USB cable unplugged and remove
power to the GCHA. Wait a few minutes and then restore power to the GCHA, thus resetting the
GCHA’s internal microprocessor. This should remedy the problem.
If you are using a preamplifier to feed the GCHA, the preamplifier’s volume must be at a medium level,
similar to the level you would play your system loudly. If the preamp’s volume is too low, the GCHA will
not receive enough signal to work with.
Check the
volume in the
computer
If the analog
inputs do not
play
Make the GCHA
the default device
Older operating
systems
Check the
preamp volume

4826 Sterling Drive, Boulder, CO 80301
PH: 720.406.8946 [email protected] www.psaudio.com Warranty 8
®Warranty
©2005 PS Audio International Inc. All rights reserved.
Owner’s Reference GCHA Headphone Amplifier
PS Audio warrants the product designated herein to be free of manufacturing defects in
material and workmanship, subject to the following conditions, for a period of three (3) years
from the date of purchase by the original purchaser or date of shipment to the authorized PS
Audio dealer, whichever comes first.
This Warranty is subject to the following conditions and limitations: the Warranty is void and
inapplicable if the product has been used or handled other than in accordance with the
instructions in the owner’s manual, abused, or misused, damaged by accident or neglect or
in being transported, or the defect is due to the product being repaired or tampered with by
anyone other than PS Audio or an authorized PS Audio repair center.
a. The product must be packaged and returned to PS Audio or an authorized PS
Audio repair center by the customer at his or her sole expense in the original packing
material. PS Audio will pay return freight of its choice for original purchasers.
b. Return Authorization Number (RA Number) is required before any product is returned
to our factory for any reason. This number must be visible on the exterior of the
shipping container for PS Audio to accept the return. Units shipped to us without a
Return Authorization Number or without a visible RA Number on the exterior of the
shipping container will be returned to the sender, freight collect.
c. RETURNED PRODUCT MUST BE ACCOMPANIED BY A WRITTEN DESCRIPTION
OF THE DEFECT.
PS Audio reserves the right to modify the design of any product without obligation to
purchasers of previously manufactured products and to change the prices or specifications of
any product without notice or obligation to any person.
In the event the product fails to meet this Warranty and the above conditions have been met,
the purchaser’s sole remedy under this Limited Warranty shall be to return the product to
PS Audio or an authorized PS Audio repair center where the defect will be repaired without
charge for parts or labor.
This Warranty is for the benefit of the original purchaser of the covered product and may be
transferred to a subsequent purchaser of the product.
Extended warranty policies:
1. By submitting the registration card, via mail or internet, within 90 days of purchase,
the warranty period will be extended to 5-years from the date of purchase.
2. If outside of the 90-day window of purchase, a 2-year extended warranty can be
TERMS AND
CONDITIONS
Conditions
Remedy
Transfer of
Warranty

4826 Sterling Drive, Boulder, CO 80301
PH: 720.406.8946 [email protected] www.psaudio.com Warranty 9
®Warranty
©2005 PS Audio International Inc. All rights reserved.
Owner’s Reference GCHA Headphone Amplifier
purchased for any PS Audio product within the original 3-year warranty period for a
fee of $50.
3. To qualify for the extended warranty the Product must be purchased through an
authorized PS Audio dealer or distributor and you must present a written receipt.
4. All of the policies of the extended warranty are the same as the limited warranty
This warranty does not cover the cost of custom installation, customer instruction, setup
adjustments or signal reception problems.
This warranty does not cover cosmetic damage or any damage due to accident, misuse,
abuse, negligence or modification of, or to any part of the Product, without initial express
consent from PS Audio. This warranty does not cover damage due to improper operation
or maintenance, connection to improper voltage supply, or attempted repair by anyone
other than a facility authorized by PS Audio to service the Product.
This warranty is invalid if the factory applied serial number has been altered or removed
from the Product.
To locate the servicer or dealer nearest you, or for service assistance or resolution of a
service problem, or for product information or operation, call or email PS Audio.
ANY IMPLIED WARRANTIES RELATING TO THE ABOVE PRODUCT SHALL BE LIMITED
TO THE DURATION OF THIS WARRANTY. THE WARRANTY DOES NOT EXTEND TO ANY
INCIDENTAL OR CONSEQUENTIAL COSTS OR DAMAGES TO THE PURCHASER. Some
states do not allow limitations on how long an implied warranty lasts or an exclusion or
limitation of incidental or consequential damages, so the above limitations or exclusions may
not apply to you. This Warranty gives you specific legal rights, and you may also have other
rights that vary from state to state.
Inquiries regarding the above Limited Warranty may be sent to the following address: PS
Audio International, Inc., 4826 Sterling Drive, Boulder, Colorado 80301 ATTN: Customer
Service; Email: [email protected]; Voice 720-406-8946; FAX: [phone].
PS Audio has authorized distribution in many countries of the world. In each country, the authorized
importing retailer or distributor has accepted the responsibility for warranty of products sold by that
retailer or distributor. Warranty service should normally be obtained from the importing retailer or
distributor from whom you purchased your product. In the unlikely event of service required beyond
the capability of the importer, PS Audio will fulfill the conditions of the warranty. Such product must
be returned at the owner’s expense to the PS Audio factory, together with a photocopy of the bill of
sale for that product, a detailed description of the problem, and any information necessary for return
shipment.
Outside the US
Miscellaneous

4826 Sterling Drive, Boulder, CO 80301
PH: 720.406.8946 [email protected] www.psaudio.com Service 10
®Service
©2005 PS Audio International Inc. All rights reserved.
Owner’s Reference GCHA Headphone Amplifier
In the unlikely event there is a problem with your PS Audio component, please contact your dealer,
distributor, or the PS Audio corporate research center to discuss the problem before you return the
component to our California manufacturing facilities for repair. Products shipped to either the factory
or the corporate research facilities will be refused and returned freight collect if not accompanied by a
PS Audio Service Department issued return authorization number (RA Number).
Return authorization numbers must be prominently displayed on the outside of the box and an
accompanying letter describing the problem and re-listing the RA number must be inside the box to
qualify for service.
If you are transferring your warranty, you must first contact PS Audio or your dealer or distributor for
details.
To contact the PS Audio Service Department:
TELEPHONE [phone]
HOURS Monday-Friday, 9:00 am to 5:00 pm MST
FAX [phone]
E-MAIL [email protected]
WEBSITE http://www.psaudio.com
If you are in the United States or Canada use the following procedure:
1. Obtain a Return Authorization Number (R/A number) and shipping address from the PS Audio
Service Department.
2. Insure and accept all liability for loss or damage to the product during shipment to the PS Audio
factory and ensure all freight (shipping) charges are prepaid.
The product may also be hand delivered to the California or Colorado facilities if arrangements with
the Service Department have been made in advance. Proof of purchase will be required for warranty
validation at the time of hand delivery.
Use the original packaging to ensure the safe transit of the product to the factory, dealer, or distributor.
PS Audio may, at its discretion, return a product in new packaging and bill the owner for such packaging
if the product received by PS Audio was boxed in nonstandard packaging or if the original packaging
was so damaged to the point it was unusable. If PS Audio determines that new packaging is required,
the owner will be notified before the product is returned.
To purchase additional packaging, please contact your authorized PS Audio dealer, distributor, or the
PS Audio Service Department for assistance.
If you are outside the United States or Canada and require service you must contact your country’s
dealer or distributor for instructions. PS Audio warranties its products (see warranty section) worldwide.
If you require
service in North
America
Obtain an RA
number
Contact
information
If you are in the
United States or
Canada
Use original
packing
If you are outside
the US or Canada

4826 Sterling Drive, Boulder, CO 80301
PH: 720.406.8946 [email protected] www.psaudio.com Service 11
®Service
©2005 PS Audio International Inc. All rights reserved.
Owner’s Reference GCHA Headphone Amplifier
Service for PS Audio products outside the United States and Canada is handled through your country’s
distributor or dealer.
1. Obtain a Return Authorization Number (R/A number) and shipping address from your dealer or
distributor’s Service Department.
2. Insure and accept all liability for loss or damage to the product during shipment to the dealer or
distributor’s Service Department and ensure all freight (shipping) charges are prepaid.
If you feel your country’s dealer or distributor is either unwilling or unable to service your PS Audio
products, please contact our service department at [email protected] or at the above contact
numbers to discuss the situation.
Voltage changes to match your country’s voltage and frequency requirements to your PS Audio product
are possible only through your dealer, your country’s authorized PS Audio distributor or the factory.
Units purchased outside your country of residence will not be changed to the appropriate voltage
unless prior arrangements have been made at the time of purchase. Please refer any questions to
your dealer or distributor or by contacting the PS Audio service department.
Your PS Audio product serial number is:
Please fill in the dealer or distributor’s information from where you originally purchased the unit.
If you have
problems
Voltage changes
Your serial
number
Your purchase
information
Date of purchase

4826 Sterling Drive, Boulder, CO 80301
PH: 720.406.8946 [email protected] www.psaudio.com Notes
®Notes
©2005 PS Audio International Inc. All rights reserved.
Owner’s Reference GCHA Headphone Amplifier