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& GFA-6006
Custom Install Power Ampliers
1ADCOM GFA-6006/02 Owner’s Manual |
3ADCOM GFA-6006/02 Owner’s Manual |
WELCOME
Dear Fellow ADCOM Product Owner,
Welcome to the ADCOM family! For more than twenty years, ADCOM products have delivered
excellent performance and value for customers around the world. Our products are designed by
our experienced and demanding engineering team, built to the highest standards in our factory,
and sold and serviced through dealers, custom installers, and other retailers whose primary goal
is your complete satisfaction.
We know you are anxious to hear your new power amplifier in action, but please take a few
minutes to read this owner’s manual before connecting the power amplifier to your system. It
is particularly important that you connect your power amplifier to your preamplifier while they
are unplugged and your other equipment is turned off. This will protect your equipment from
potential short circuits that may occur during installation. In addition, it is important that you
allow for adequate ventilation around your power amplifier and other equipment, since excessive
heat buildup can shorten the life of any electronic product, including the power amplifier. Once
you have correctly connected your new power amplifier to your other components, you should
be able to enjoy many trouble-free years of performance.
We conduct a thorough quality and performance test on each and every power amplifier we build
in our factory prior to shipment. In the rare case of a defect that may occur after shipment, we
stand behind our power amplifier with a five-year parts and labor warranty. To register for this
warranty, please complete and mail the enclosed warranty card back to ADCOM. Also, please
keep a copy of your sales receipt with the owner’s manual so you may provide proof of eligibility
for the warranty should the need arise.
We know you will be very happy with the audio performance of your new power amplifier. We
hope you will also consider other ADCOM products, such as our line of multichannel amplifiers,
preamplifiers and digital source components. In addition, we design and manufacture complementary products such as surge suppressors and speaker selectors. Please visit our web site at
www.adcom.com to learn more about our complete line of stereo, home theater, and distributed
audio/video products.
On behalf of all of us at ADCOM, I want to thank you for selecting our product for your home or
business entertainment system.
Sincerely,
Douglas Klein
President
ADCOM is a registered trademark of Klein Technology Group, LLC.
ADCOM Telephone: (480) 607-2277
A division of Klein Technology Group, LLC Fax: (480) 348-9876
8541 East Anderson Drive Email: info@adcom.com
Scottsdale, Arizona 85255 USA Web: www.adcom.com
Copyright © 2003 Klein Technology Group, LLC. All rights reserved. No part of this manual may be reproduced or electronically transmitted without the express written consent of Klein Technology Group, LLC.
| ADCOM GFA-6006/02 Owner’s Manual2
TABLE OF CONTENTS
Welcome . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Table of Contents . . . . . . . . . . . . . . . . . . . . . . 3
Precautions and Warnings . . . . . . . . . . . . . . . 4
Unpacking Your Amplifier . . . . . . . . . . . . . . . 5
Safety Information . . . . . . . . . . . . . . . . . . . . . 5
Description & Features . . . . . . . . . . . . . . . . . 6
Installing & Connecting . . . . . . . . . . . . . . . . . 7
Description of Front Panel . . . . . . . . . . . . . . 8
Front Panel Illustration . . . . . . . . . . . . . . . . . 8
Description of Rear Panel. . . . . . . . . . . . . 9-11
Rear Panel Illustration . . . . . . . . . . . . . . . . . . 9
Trouble Shooting . . . . . . . . . . . . . . . . . . . . . 12
Service Information . . . . . . . . . . . . . . . . 12-13
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Your Responsibilites . . . . . . . . . . . . . . . . . . . 13
GFA-6002 Specifications . . . . . . . . . . . . . . . 14
GFA-6006 Specifications . . . . . . . . . . . . . . . 15
3ADCOM GFA-6006/02 Owner’s Manual |
5ADCOM GFA-6006/02 Owner’s Manual |
THE FOLLOWING PRECAUTIONS AND SAFETY INSTRUCTIONS
power lines
ground clamp
power service grounding
electrode system
(e.g. interior metal water pipe)
ground clamps
ground clamps
optional antenna grounding
electrode driven 8 feet (2.44 M) into
the earth if required by local codes.
bonding jumper, d
service
entrance
equipment
service entrance
conductors
standoff
insulators, b
mast
antenna
lead-in wire
antenna
discharge
unit, c
ground wire, a,b
to external antenna
terminals of radio receiver
ground wire, a,b
CAUTION
RISK OF ELECTRI C SHOCK
DO N OT
OPEN
CAUTION
RISK OF ELECTRI C SHOCK
DO N OT
OPEN
ARE REQUIREMENTS OF UL AND CSA SAFETY REGULATIONS
Warning: To reduce the risk of re or electric shock, do
not expose this unit to rain or moisture.
The graphic symbol of a lightning ash with an
arrow point within a triangle signies that there
is dangerous voltage within the unit and it poses
a hazard to anyone removing the cover to gain
access to the interior of the unit. OnIy qualied
service personnel should make any such attempt.
The graphic symbol of an exclamation point within
an equilateral triangle warns a user of the device
that it is necessary to refer to the instruction manual
and its warnings for proper operation of the unit.
Do not place this unit on an unstable cart, stand, tripod,
bracket, or table. The unit may fall, causing serious
injury to a child or adult, and serious damage to the
unit. Use only with a cart, stand, tripod, bracket, or
table recommended by the manufacturer or sold with
the unit. Any mounting of the device should follow the
manufacturer’s instructions, and should use a mounting
accessory recommended by the manufacturer.
Read all the safety and operating instructions before connecting or using
this unit.
Retain this notice and the owner’s manual for future reference.
All warnings on the unit and in its operating instructions should be adhered to.
All operating and use instructions should be followed.
Do not use this unit near water. For example, near a bathtub, washbowl,
kitchen sink, laundry tub, in a wet basement, or near a swimming pool.
POUR PREVENIR LES CHOCS ELECTRIQUES NE PAS UTILISER CETTE FICHE
ATTENTION
POLARISEE AVEC UN PROLONGATEUR, UNE PRISE CE COURANT OU UNE
AUTRE SORTIE CE COURANT, SAUF SI LES LAMES PEUVENT ETRE INSEREES
A FOND SANS EN LAISSER AUCUNE PARTIE A DECOUVERT.
CAUTION
TO PREVENT ELECTRIC SHOCK DO NOT USE THIS POLARIZED PLUG WITH
AN EXTENSION CORD, RECEPTACLE OR OTHER OUTLET UNLESS THE
BLADES CAN BE FULLY INSERTED TO PREVENT BLADE EXPOSURE.
CAUTION POWER LINES
Any outdoor antenna must be located away from all power lines.
OUTDOOR ANTENNA GROUNDING
If an outside antenna is connected to your tuner or tuner/preamplier,
be sure the antenna system is grounded so as to provide some protection
against voltage surges and built-up static charges. Section 810 of the
National Electrical Code, ANSI/NFPA No. 701984, provides information
with respect to proper grounding of the mast and supporting structure,
grounding of the lead-in wire to an antenna discharge unit, size of
grounding conductors, location of antenna discharge unit, connection to
grounding electrodes, and requirements for the grounding electrode.
a. Use No.10 AWG (5.3 mm2) copper, No.8 AWG (8.4 mm2) aluminum, No.17
AWG (1.0 mm2) copper clad steel or bronze wire, or larger, as a ground wire.
b. Secure antenna lead-in and ground wires to house with stand-off
insulators spaced from 46 feet (1.221.83 m) apart.
c. Mount antenna discharge unit as close as possible to where lead-in enters
house.
d. Use jumper wire not smaller than No.6 AWG (13.3 mm2) copper, or the
equivalent, when a separate antenna grounding electrode is used. See NEC
Section 810-21 (j).
EXAMPLE OF ANTENNA GROUNDING AS PER NATIONAL ELECTRICAL CODE
INSTRUCTIONS CONTAINED IN ARTICLE 810. RADIO AND TELEVISION EQUIPMENT.
The unit should be installed so that its location or position does not interfere
with its proper ventilation. For example, it should not be situated on a
bed, sofa, rug, or similar surface that may block the ventilation openings;
or placed in a built-in installation, such as bookcase or cabinet, that may
impede the ow of air through its ventilation openings.
The unit should be situated away from heat sources such as radiators, heat
registers, stoves, or other devices (including ampliers) that produce heat.
The unit should be connected to a power supply outlet only of the voltage
and frequency marked on its rear panel.
The power supply cord should be routed so that it is not likely to be walked
on or pinched, especially near the plug, convenience receptacles, or where
the cord exits from the unit.
Clean unit only as recommended in its instruction manual.
The power supply cord of the unit should be unplugged from the wall outlet
when it is to be unused for a long period of time.
Care should be taken so that objects do not fall, and liquids are not spilled,
into the enclosure through any openings.
This unit should be serviced by qualied service personnel when:
A. The power cord or the plug has been damaged; or
B. Objects have fallen, or liquid has been spilled, into the unit; or
C. The unit has been exposed to rain, or liquids of any kind; or
D. The unit does not appear to operate normally, or exhibits a marked
change in performance; or
E. The device has been dropped, or the enclosure damaged.
DO NOT ATTEMPT SERVICING OF THIS UNIT YOURSELF.
REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.
| ADCOM GFA-6006/02 Owner’s Manual4
This reminder is provided to call the CATV system installer’s attention to
NOTE TO CATV SYSTEM INSTALLER
Article 82022 of the National Electrical Code that provides guidelines for
proper grounding and, in particular, species that the cable ground shall
be connected to the grounding system of the building, as close to the
point of cable entry as practical.
Unpacking the Amplier
Before your new ADCOM amplier left
our factory, it was carefully inspected
for physical imperfections and tested
for all electrical parameters as a
routine part of ADCOM’s systematic
quality control. This, along with full
operational and mechanical testing,
should ensure a product awless in
both appearance and performance.
After you have unpacked the GFA6002/06, inspect it for physical
damage. Save the shipping carton
and all packing material as they are
intended to reduce the possibility of
transportation damage should the
amplier ever need to be shipped
again. In the unlikely event damage
has occurred, notify your dealer
immediately and request the name of
the carrier so a written claim to cover
shipping damages can be initiated. The
right to a claim against a public carrier
can be forfeited if the carrier is not
notied promptly in writing and if the
shipping carton and packing materials
are not available for inspection by the
carrier. Save all packing materials until
the claim has been settled.
Safety Instructions
DANGER: Visible and invisible laser
radiation when open and interlock
failed or defeated. Avoid direct
exposure to beam.
WARNING: There are no user
serviceable parts inside. Refer
all servicing to qualied service
personnel.
WARNING: To reduce the risk of re
or electric shock, do not expose the
unit to moisture or water. Do not
allow foreign objects to get into the
enclosure. If the unit is exposed to
moisture, or a foreign object gets into
the enclosure, immediately disconnect
the power cord from the wall. Take the
unit to a qualied service person for
inspection and necessary repairs. Read
all the instructions before connecting
or operating the component. Keep
this manual so you can refer to these
safety instructions. Heed all warnings
and safety information in these
instructions and on the product itself.
Follow all operating instructions. Clean
the enclosure only with a dry cloth or a
vacuum cleaner. You must allow 10 cm
or 4 inches of unobstructed clearance
around the unit. Do not place the unit
on a bed, sofa, rug, or similar surface
that could block the ventilation
openings. If the unit is placed in a
bookcase or cabinet, there must be
ventilation of the cabinet to allow
proper cooling. Keep the component
away from radiators, heat registers,
stoves, or any other appliance that
produces heat.
The unit must be connected to a power
supply only of the type and voltage
specied on the rear panel. Connect
the component to the power outlet
only with the supplied power supply
cable or an exact equivalent. Do not
modify the supplied cable. Do not
defeat grounding and/or polarization
provisions. The cable should be
connected to a 3-pin polarized wall
outlet, matching the wide blade of the
plug to the wide slot of the receptacle.
Do not use extension cords. Do not
route the power cord where it will
be crushed, pinched, bent, exposed
to heat, or damaged in any way. Pay
particular attention to the power cord
at the plug and where it exits the back
of the unit. The power cord should be
unplugged from the wall outlet if the
unit is to be left unused for a long
period of time. Immediately stop using
the component and have it inspected
and/or serviced by a qualied service
agency if:
• the power supply cord or plug has
been damaged;
• objects have fallen or liquid has
been spilled into the unit;
• the unit has been exposed to rain;
• the unit shows signs of improper
operation; or
• the unit has been dropped or
damaged in any way.
FCC Information: This equipment
has been tested and found to comply
with the limits for a Class B digital
device, pursuant to Part 15 of the
FCC Rules. These limits are designed
to provide reasonable protection
against harmful interference in
a residential installation. This
equipment generates, uses and
can radiate radio frequency energy
and, if not installed and used in
accordance with the instruction, may
cause harmful interference to radio
communications. However, there is
no guarantee that interference will
not occur in a particular installation.
If this equipment does cause harmful
interference to radio or television
reception, which can be determined
by turning the equipment off and
on, the user is encouraged to try to
correct the interference by one or
more of the following measures:
• Reorient or relocate the receiving
antenna.(TV, radio, etc.)
• Increase the separation between
the equipment and receiver
• Connect the equipment to an outlet
on circuit different from that to
which the receiver is connected.
• Consult the dealer or an
experienced radio/TV technician
for additional help.
Caution: This device complies with
part 15 of the FCC Rules operation is
subject to the following to 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.
5ADCOM GFA-6006/02 Owner’s Manual |
7ADCOM GFA-6006/02 Owner’s Manual |
Description of Unit
G F
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Congratulations on your decision to purchase the GFA-6002 or
GFA-6006 custom installation power amplier. The GFA-6002
and GFA-6006 have been designed to be musically accurate
in a conguration specically designed to integrate with any
home audio pre-amplier. You have made a wise choice that
will reward you for years to come with exceptionally accurate
and musical sound reproduction. To realize the full potential
of your new amplier, and before making any connections to
it, please read these operating and installation instructions
thoroughly.
GFA-6002 Features
• Precision-matched devices used throughout the signal path
GFA-6006 Features
• Precision-matched devices used throughout the signal path
• 60,000 µF of power supply-lter capacitance to optimize
transient response
• Bridgeable operation; 6/5/4/3 channels
• Audio IN and OUT for each channel for exible system
conguration
• Independent input level controls for each channel
• Independent power supplies for each channel
• Fewer gain stages improve signal reproduction accuracy
• Custom toroidal power transformer provides better
regulation and greater peak current capability
• Independent thermal-overload and distortion LEDs for all
channels
• 27,000 µF of power supply-lter capacitance to optimize
transient response
• Bridgeable operation
• Audio IN and OUT for each channel for exible system
conguration
• Independent input level controls for each channel
• Independent power supplies for each channel
• Fewer gain stages improve signal reproduction accuracy
• Custom toroidal power transformer provides better
regulation and greater peak current capability
• Independent thermal-overload and distortion LEDs for all
channels
• High quality, gold-plated 5-way binding posts
• High quality, gold-plated RCA jacks
• Large independent internal heatsinks for greater cooling
capability of output devices
• Two convenient modes of power ON/OFF triggering; 3-30V
AC/DC triggering & audio signal sensing
• High quality, gold-plated 5-way binding posts
• High quality, gold-plated RCA jacks
• Large independent internal heatsinks for greater cooling
capability of output devices
• Two convenient modes of power ON/OFF triggering;3-30V
AC/DC triggering & audio signal sensing
• Heavy gauge, anodized aluminum front panel
• Powder-coated, baked chassis and top cover for greater
durability
• Cooling vents for greater efciency and cooler operation
while driving low impedance loads
• Ground lift to eliminate ground loops
• Detachable AC cord for easier installation
• Heavy gauge, anodized aluminum front panel
• Powder-coated, baked chassis and top cover for greater
durability
• Cooling vents for greater efciency and cooler operation
while driving low impedance loads
• Ground lift to eliminate ground loops
• Detachable AC cord for easier installation
| ADCOM GFA-6006/02 Owner’s Manual6
Installing the GFA-6002
and GFA-6006
During normal home operation the
internal heatsinks of the GFA-6002/
6006 may become warm. However,
there are instances during high-level
playback into low impedances when
the heatsinks will become much
warmer than usual. To ensure the
amplier’s long-term, trouble-free
operation it is necessary to provide
adequate ventilation for the heatsinks.
Therefore, the GFA-6002/6006 should
be kept away from external sources
of heat such as radiators and hot-air
ducts. The GFA-6002/6006 should never
be placed with other heat-producing
components in a cabinet or enclosure
lacking free air ow. The top and
bottom panel of the amplier’s chassis
have been provided with vents to allow
the necessary cooling of the internal
components. It is imperative that these
vents are not obstructed in any way.
We recommend that you do not stack
other components on top of the
GFA-6002/6006. This is particularly
important if your system includes
low-impedance loudspeakers which
are difcult to drive, or if you will
consistently demand high volume
levels from the amplier and speaker
system. Not only will heat generated by
the amplier affect the performance
of equipment stacked on top of the
GFA-6002/6006, but the free ow of
air through the ventilating slots in the
amplier may be partially obstructed.
If you observe these recommendations,
the GFA-6002/6006 will perform
reliably in any reasonable environment.
You should also pay attention to such
normal considerations as protection
from excessive dust and moisture.
Occasional vacuuming of accumulated
dust on the chassis, panels and around
the ventilating slots should be all that
is required.
The optimal performance of your new
GFA-6002/6006 will ultimately depend
on the care with which you make the
connections between the amplier,
pre-amplier, surround sound decoder
and the loudspeakers. All input and
output signal connections should be
made only with high quality, low-loss,
low capacitance cables following the
recommendations in the Inputs and
Outputs section of CONNECTING THE
GFA-6002/6006.
Connecting the
GFA-6002 and GFA-6006
When connecting the amplier to the
loudspeaker, it is vital to maintain
proper polarity (positive to positive,
negative to negative). On the GFA6002/6006, the positive terminal is
color coded RED and labeled “+,” and
the negative is color coded BLACK and
labeled “-”. The positive terminal on
the speaker will be color coded RED, or
will be labeled “+,” “pos,” “positive,”
“8 ohms” or “4 ohms.” The negative
terminal on the speaker will be color
coded BLACK, or will be labeled “-,”
“neg,” “negative,” “C,” “Common,”
“G,” or “ground.”
We recommend that your speaker
cables be terminated with “U” type
spade connectors. These will give the
most contact area insuring long-term
reliability. The spade connector should
have a maximum width of 0.57 inches and
an opening width of no less than 0.25".
To properly connect the speaker cable
to the binding posts, turn the insulated
head of the binding post clockwise until
the wire or connector is rmly secured.
Finger pressure is sufcient and you
should not use pliers or other tools
which could damage or over-tighten
the binding-post assembly. The binding
posts have been designed in such a
way that nger pressure is all that is
required to cause a “pinching” action
among the different metal surfaces to
ensure proper connection.
It is very important to use the
correct size of wire in order to avoid
unnecessary loss of amplier power
in the cable, reduction of amplier
damping factor and other undesirable
conditions. Sound audio engineering
practice suggests the use of at least
AWG16, stranded, copper cable.
Recommended capacitance of the
speaker wire should not exceed 5OpF
per foot. This insures high frequencies
will not be rolled off.
All loudspeakers having a nominal
impedance down to 4 ohms can be
connected to and driven by the GFA6002/6006. The amplier can drive
these low-impedance speakers at
more than adequate power levels
with no difculty. It should be noted
that many loudspeaker systems which
are nominally rated at 4 ohms drop
in impedance, in some parts of their
frequency range, to as low as 2 ohms
(and sometimes less). You will not
experience difculties even with these
very low impedance loads unless you
demand excessively high volume levels
from your system.
We do not recommend that you run
multiple sets of speakers to each
speaker output on the GFA-6002/6006.
Instead, we recommend that you use a
multiple speaker selector such as the
ADCOM GFS-300 or GFS-600. A speaker
selector enables you to maintain good
sonic integrity while giving you the
exibility to add speakers throughout
your house and maintain proper
impedance levels to help prevent over
heating of the amplier.
Finally, we suggest that you follow
this chart for speaker wire lengths and
gauges. If longer runs are needed, it is
best to consult with your ADCOM Dealer
to maximize the performance of your
system with your exact conditions.
up to 24 feet — AWGI6
up to 36 feet — AWGI4
up to 58 feet — AWGI2
7ADCOM GFA-6006/02 Owner’s Manual |
9ADCOM GFA-6006/02 Owner’s Manual |
Description of Unit:
Front Panel
[1]
On/Standby/Vacation
This LED monitors the status of operation
of the amplier. The LED will glow
amber whenever the rear panel Power/
Vacation switch is in the OFF (powered
down with only minimal circuitry
energized) or AUTO position (amplier
is in the standby mode). When powered
up (from AUTO) using the 3-30V AC/DC
triggering or signal sensing feature, the
LED will change to red, changing back
to amber when there is no longer signal
present or the 3-30V AC/DC triggering
is not energized. The LED will glow red
whenever the rear panel power switch
is in the ON and the GFA-6006/6002 is
energized.
The Power LED indicates that there is
AC voltage being fed to the amplier,
but it does not signify that the entire
amplier’s circuits are in operation.
this would indicate that the thermostat
within the transformer has opened.
Once the temperature within the
transformer decreases to a normal
level, the thermostat will reset itself
automatically and normal operation
will resume. If you are to avoid
continually tripping the thermostat in
the transformer, you must reduce the
sound level demands, correct the load
impedance of the loudspeakers, or both.
[2]
Thermal Protection
The GFA-6002/6006 are provided with
a thermal protection circuit which will
shut down the individual ampliers
if its heatsink temperature reaches
85°C. The Thermal Protection LEDs will
light whenever the thermal protection
circuit in its respective channel has been
triggered and the amplier is inoperative.
The thermal protection circuitry will
typically be triggered by very high power
demands into impedances much lower
than the amplier is capable of driving
been over-driven or that the load the
loudspeakers are presenting to the
amplier is unreasonably low. If you
wish to prevent recurrent activation
of the thermal protection circuitry, you
must reduce the volume-level demands
or correct the load impedance condition
which may be causing activation of this
circuitry.
[3]
Distortion Alert
The Distortion Alert circuit is a
unique ADCOM distortion detection
system which reads all forms of
non-linear distortion such as THD, IM,
slew-induced, “clipping,” etc. The
Distortion Alert LEDs will light when
distortion reaches approximately 1%
regardless of impedance, voltage/
current phase angle or the reactance
of the loudspeakers which the
amplier is driving. Sometimes, when
the amplier is in use, the LEDs may
occasionally icker during high volume
listening, particularly if you are driving
1
If, for example, one of the Thermal
Protection LEDs glows, that amplier
channel will not produce sound
even though the Power LED may
still glow. Additionally, the internal
power transformer is provided with a
thermostat which will interrupt power
into the transformer if its temperature
exceeds 125°C. This high temperature
will seldom, if ever, be encountered
unless the amplier is subjected to
abnormal conditions, such as operation
into loads of less than 3 ohms at very
high listening levels. If the AC Fuse has
not failed, the Power LED is out, and the
Thermal Protection LED does not glow,
| ADCOM GFA-6006/02 Owner’s Manual8
2
at those levels. If any amplier channel’s
output through the loudspeaker(s) ceases
abruptly and its Thermal Protection LED
glows, you will know that its heatsink
temperature has become unacceptably
high and the circuitry is protecting the
amplication devices. Please note that
the Power LED will remain on and the
amplier will still be energized. Once
the temperature of the heatsink(s) drops
to a safe operating level, that amplier
will automatically resume operation.
Activation of the Thermal Protection
circuitry in any of the channels of
amplication in the GFA-6002/6006 is
an indication that the amplier has
3
low impedances. This ickering is
no cause for concern. The LEDs are
simply warning you that the amplier is
approaching its maximum power output
into the particular loudspeakers you are
using. If, however, the Distortion Alert
LEDs glow brightly or are illuminated
most of the time during playback,
you are over driving the amplier and
should turn down your volume control to
reduce the listening level. Otherwise, it
may cause the Thermal Protection to be
activated or, in extreme cases, damage
your loudspeakers.
GFA-6006 Rear Panel
4
5
GFA-6002 Rear Panel
Description of Unit:
Rear Panel
[4]
Inputs & [5] Outputs
The audio inputs and outputs for the
GFA-6002 and GFA-6006 are through
high-quality, gold-plated RCA jacks to
minimize high-frequency losses, noise,
etc. They will accept standard RCA-type
plugs, one for each of the channels. To
insure that the performance designed
into the amplier is preserved, you
should use the highest quality audio
cables possible.
The GFA-6002 and 6006 feature inputs
and outputs for each channel to
allow “daisy-chaining” of channels or
additional ampliers in an installation.
To direct signal from one channel to
another, connect an appropriate cable
(RCA to RCA, male to male) from the
output of one channel to the input of
the desired channel.
8
7
6
In bridged operation (see Bridged
Operation) only the Bridged
Mono Input is to be used. On the
GFA-6006, bridged mono inputs are
channels 1,3, and 5. On the GFA-6002,
bridged mono input is channel 1. For
“daisy-chaining” the corresponding
outputs for these channels are active.
[6]
Input Level Adjustment
Each channel has an input level
adjustment. The purpose of this
adjustment is to balance levels
in installations where physical
circumstances may create a large
difference in volume. Turn the
level control to the fully clockwise
position for maximum sensitivity;
turning the control counter clockwise
reduces sensitivity. Use a small
blade screwdriver to adjust. In
balanced operation only the input
adjustments for channels 1, 3, and 5
(GFA-6006) or channel 1 (GFA-6002)
11
10
9
are effective (see BRIDGED OPERATION
for more details).
[7]
Amplier Outputs
The GFA-6006/6002’s connections to
the loudspeakers are made through
high-grade, 5-way, binding post
terminals. There are two terminals for
each speaker, which are colored RED
for the positive (+) output and BLACK
for the negative (-) output. The binding
posts will accept a variety of connector
types; the most secure and prevalent of
these is the “U”-type spade connectors
(at least 0.25” wide and maximum
width of 0.57”). The terminal will also
accept bare wire (up to AWG10) and
“banana” type plugs (single or dual).
In connecting the amplier to the
loudspeaker, it is vital to maintain
proper polarity (positive to positive,
negative to negative) in stereo
operation. On the GFA-6006/6002, the
positive terminal is color coded RED
1
9ADCOM GFA-6006/02 Owner’s Manual |
11ADCOM GFA-6006/02 Owner’s Manual |
and labeled “+,” and the negative is
color coded BLACK and labeled “-”. The
positive terminal on the speaker will be
color coded RED, or will be labeled
“+,” “pos,” “positive,” “8 ohms,” or “4
ohms.” The negative terminal on the
speaker will be color coded BLACK, or
will be labeled “-,” “neg,” negative,”
“C,” “Common,” “G,” or “ground.”
Note: Bridged operation requires different
loudspeaker connections. For details see
the section Bridged Operation.
[8]
Bridged Operation
In bridged operation the output of
two stereo amplier channels are
“combined” to drive one monophonic
speaker. In the bridged mode the
GFA-6002 and 6006 wattage capability
increases to 175 Watts at 8 ohms
per bridged channel. The GFA-6006
allows for any of three adjoining
“pairs” of ampliers to be bridged.
For input directions see the section
Audio Signal Inputs and Outputs. To
engage bridged operation for a pair
of amplier channels, switch the
corresponding toggle switch to the
bridged position. In bridged operation
the proper loudspeaker connection is
to the POSITIVE (+) terminals of each
of the pair of bridged channels. Do
Not connect the Negative (-) speaker
terminals under any circumstances in
the bridged mode.
[9]
3-30V AC/DC Triggering
The GFA-6002 and GFA-6006 are very
high power ampliers and as such must
be directly connected to the wall outlet
or an appropriate surge protector or
AC line conditioner. It must never be
connected to the “switched” outlets
on the rear panel of a pre-amplier.
Usually, this would mean that when
you turn on/off your pre-amplier you
would have to turn on/off your power
amplier separately. We have, however,
provided the ability to control the
OFF/ON function (actually “powering
up” from standby) of the amplier by
a 12-Volt DC output jack on the rear
of certain ADCOM pre-ampliers and
tuner pre-ampliers. When using this
feature the rear panel Power Switch
must be left in the in “auto” position.
To connect, you will need a mono-mini
phone plug to a mono-mini phone
plug cable of appropriate length (not
included) to reach from the rear panel
jack of the amplier to the rear panel
of the pre-amplier. Contact your
dealer for information on using this
feature with ADCOM and other brand
pre-ampliers. Although 12V DC is
optimal, the circuit will operate from
approximately 3 to 30V AC or DC, not to
exceed 250mA. The center conductor
(tip) is positive. When using the 3-30V
AC/DC triggering method the unit will
return to standby approximately two
and one half minutes after the signal is
no longer present.
Audio Signal Sensing
Alternately, the sensing of audio signal
can turn on the 6002/6006 amplier.
Any time the amplier detects the
presence of an incoming audio signal
it will “power up” from standby. Please
note that the speed of “turn on” by
AC/DC triggering and audio sensing is
different. AC/DC triggering is slightly
faster. When using the signal sensing
method, the unit will return to standby
approximately two and one half minutes
after the signal is no longer present.
An incoming signal level of 5-7 mV is
required to trigger this sensing method.
[10]
AC Fuse
The AC Fuse protects the electronic
circuits of the GFA-6002/6006. This
fuse, normally, will fail only if there is
an overload within the GFA-6002/6006.
It may, however, fail if the amplier
attempts to deliver very high power
into very low-impedance loudspeakers.
In either case, BE SURE TO REPLACE
THE AC FUSE ONLY WITH AN EXACT
REPLACEMENT FUSE.
| ADCOM GFA-6006/02 Owner’s Manual10
The proper fuse values are:
GFA-6002 for 120 volt operation
Fuse Rating: 5 Amp 250 Volt
Buss®: AGC-5/250V
Littlefuse®:(3AG) 312005/250V
GFA-6002 for 230 volt operation
Fuse Rating: 3 Amp 250 Volt
Buss®: AGC-3/250V
Littlefuse®:(3AG) 312003/250V
GFA-6006 for 120 volt operation
Fuse Rating: 12 Amp 250 Volt
Buss®: AGC-12/250V
Littlefuse®:(3AG) 3120012/250V
GFA-6006 for 230 volt operation
Fuse Rating: 6 Amp 250 Volt
Buss®: AGC-6/250V
Littlefuse®:(3AG) 312006/250V
Before attempting to replace a failed
fuse, be certain to unplug the AC Power
Cord from the AC wall outlet to prevent
possible electrical shock. Replace the
AC fuse only with one identical in type
and rating as printed on the rear panel.
DO NOT USE ANY SUBSTITUTE FUSES
WITH DIFFERENT RATINGS OR VALUES.
Failure to observe this precaution may
cause serious damage to the amplier
circuits, may create a hazard re, and
may void the warranty.
If the Power LED does not glow, it
may be an indication that the AC
fuse has blown. If you are using the
12V DC Triggering feature it may be
possible that there is a problem with
that connection. To determine if the
problem is caused by a malfunction
in the 12V DC system, remove the
small plug inserted into the I2V DC
Triggering jack. Press the front panel
power switch to turn off the amp,
and immediately re-press the power
switch. If the problem is caused by the
12V DC triggering circuit the amp will
turn on and the LED will glow. DO NOT
attempt repair of the 12V DC system. If
you are not sure or the amplie displays
other symptoms, please consult the
RESOLVING PROBLEMS section.
Fuse Replacement
Since the fuse has a ceramic body
and you cannot visually examine the
fuse element, it is suggested that you
replace it with an identical substitute
or bring the fuse to your ADCOM dealer
so they may check its integrity.
[11]
AC Power Cord
The AC cord provides power to operate
all the GFA-6002/6006’s circuits. Its
plug can be connected to a standard
wall outlet provided the outlet supplies
a voltage compatible with the power
requirements printed on the rear panel
of the GFA-6002/6006.
11ADCOM GFA-6006/02 Owner’s Manual |
13ADCOM GFA-6006/02 Owner’s Manual |
SYMPTOM POSSIBLE REASON POSSIBLE SOLUTION
Power LED does not AC Power Cord(s) not plugged in. Plug in AC Power Cord(s).
glow. No sound AC Fuse(s) failed. Replace AC Fuse(s).
Transformer thermal protection engaged. Wait until unit cools down. It will reset.
I2V DC triggering malfunctioning. Reset power switch manually. Check
connection of 12V DC trigger at source.
Power LED glows, Preamp or source unit is not on. Make sure whole system is on.
but no sound Connections in rear of amp are loose. Verify all connections on rear of amp.
One channel not INPUT(s) or OUTPUT(s) connector Verify both connections on that channel.
producing sound disconnected or loose.
Speaker disconnected. Verify connection at speaker.
Internal protection engaged. Bring to Dealer or Service Center.
Hum from all speakers Ground loop (difference in ground voltages If Cable TV is present (see Note 1).
at any volume between components). If Cable TV is not present (see Note 2).
Hum from all speakers Problem with source unit (CD, tape, etc.), Try different source (tuner, tape, etc.)
(hum goes up or or RCA cable connecting that source unit and/or different RCA cable.
down with volume) to the preamp.
Hum from the amplier Some major appliance, dimmer, halogen or Make sure all appliances, dimmers and
itself uorescent light is creating interference. suspect lights are off.
Troubleshooting
Use the troubleshooting notes above to solve common
situations that don’t require professional attention. If the
steps stated in possible solution do not resolve your problem, then please contact your ADCOM dealer or call the
ADCOM customer service department. Any problems not
covered here should be brought to the attention of your
ADCOM dealer or ADCOM customer service department.
A special note on “hum:” When there is a low-volume
“hum” audible throughout your speakers, even with the
main volume turned all the way down, you have a common phenomenon known as a “ground loop.” A ground loop
is basically a difference in ground voltages between two
or more components which are connected electrically and
which creates multiple current paths where there must only
be one. This difference in potentials creates a 60Hz lowlevel sound (approximately a low A), that seems to “hum.”
It can be caused by adding new components to your system,
but that does not imply there is anything electrically wrong
with any new component. With the advent of audio/video
and home theater systems, the problem has become commonplace. Generally, the cause is the Cable-TV incoming
signal line. This new incoming line may add an additional
ground at a different potential to the AC line ground of
your other equipment (refer to note I and 2, to troubleshoot a hum problem).
Note 1: Cable TV systems can sometimes contribute to
ground loop problems which cause “hum.” To determine
if your cable system is the contributing factor, disconnect
the Cable-TV incoming signal line (round, 75Ω) at the wall,
or the first component the cable is connected to (i.e. the
cable box, or VCR). If the hum is no longer present, you
must insert a “75Ω ground loop isolator” before reconnecting the line. You should check with your ADCOM dealer to
obtain one. If the “75Ω ground loop isolator” works only
partially or not at all, then please read note 2 to complete
the troubleshooting procedure.
Note 2: Make sure that the power amplifier is at least 6”
from processor or other equipment using microprocessors.
Usually putting another component between them is sufficient to minimize the hum. If this does not reduce the
hum, turn the system off and disconnect all Inputs from
the amplifier. If the hum still persists, then your dealer or
service center must examine the unit/system. If the hum
disappears, try another set of RCA cables. Connect one RCA
cable at a time to see if one specific cable is responsible.
If any or all cables cause the hum to appear, then the unit
should be evaluated for proper operation by your dealer or
authorized service center. Please see our website or call us
for a list of authorized service centers in your area.
Servicing
ADCOM has a technical service department to answer
questions pertinent to the installation and operation of your
unit. In the event of difficulty, please contact us for prompt
advice. If your problem cannot be resolved through our
combined efforts, we may refer you to an authorized repair
agency, or authorize return of the unit to our factory. To aid
us in directing you to a convenient service center, it would
| ADCOM GFA-6006/02 Owner’s Manual12
be helpful if you indicate which major city is accessible to
your home.
Please address mail inquires to:
ADCOM Service
8541 East Anderson Drive
Scottsdale, Arizona 85255 USA
Phone, Fax or Email inquires to:
Voice: (480) 607-2277 or Fax: (480) 348-9876
Monday through Friday, 8:00 AM to 4:00 PM MST
Email: service@adcom.com
For fax inquires, please include a return fax number for the
reply. When calling or writing about your ADCOM product,
be sure to note and refer to its serial number as well as
the date of purchase and the dealer from whom it was
purchased. In any communications to us, please include
a daytime phone number where we may reach you. In
the event the unit must be returned to our factory for
service, you will be instructed on the proper procedure
when you call or write for a return authorization. Under no
circumstances should your unit be shipped to our factory
without prior authorization, or packed in other than its
original carton and fillers.
If the original shipping carton and its fillers have been lost,
discarded, or damaged, a duplicate carton may be obtained
from our service department for a nominal charge.
Always ship prepaid via United Parcel Service (UPS) or other
approved carrier. Do not ship via parcel post, since the
packing was not designed to withstand rough parcel post
handling. Improper shipment of the product will void your
warranty coverage.
Warranty
ADCOM, a division of Klein Technology Group, LLC, makes
the following limited warranties. These limited warranties
extend to the original purchaser or any person receiving this
product as a gift from the original purchaser and to no other
purchaser or transferee. There is no warranty provided by
ADCOM for products purchased from unauthorized outlets
or dealers or from previous owners.
Limited Five Year Warranty (Home, Non-Commercial Use Only)
ADCOM warrants this product against defects in materials or
workmanship for a period of five (5) years after the date of
original retail purchase from an ADCOM authorized dealer.
During this period, ADCOM will repair or replace a defective
product or part, at our option, with a new or refurbished
product or part without charge to you, as long as you follow
the procedures listed below.
Limited Ninety (90) Day Warranty (Commercial Use Only)
ADCOM warrants this product against defects in materials or
workmanship for a period of ninety (90) days after the date
of original purchase from an ADCOM authorized dealer.
During this period, ADCOM will repair or replace a defective
product or part, at our option, with a new or refurbished
product or part without charge to you, as long as you follow
the procedures listed below.
All implied warranties, including implied warranties of
merchantability and fitness for a particular purpose are
limited in duration to the duration of the warranty period.
This warranty excludes all incidental and consequential
damages, unless contravened by state law. This warranty
gives you specific rights and you may have other rights
which vary from state to state.
No person, agent, distributor, dealer, or company is
authorized to change, modify or extend the terms of these
warranties in any manner whatsoever.
Your Responsibilities
The above warranties are subject to the following conditions:
(1) You must retain and present your dated invoice or bill
of sale to provide proof of original purchase from an ADCOM
Authorized Dealer and coverage under the warranty period.
(2) You must notify us within ten (10) days after you
discover a defective product or part.
(3) All warranty servicing of this product must be done by
ADCOM or an authorized ADCOM Service Center.
(4) This warranty is only valid if this product has been
purchased and used in the United States. Warranty coverage
for products purchased and used outside of the United
States is provided by local ADCOM authorized distributors.
(5) Charges by third parties for set-up, installation,
adjustments, shipment, insurance, and other charges are
not covered by this warranty.
(6) This warranty extends only to defects in material or
workmanship as limited above and does not extend to any
product or part which has been lost or discarded by you or
to damage to products or parts caused by misuse, accident,
Acts of God such as lightning or fluctuations in electrical
power, improper installation, improper maintenance or use in
violation of instructions provided in this Owner’s Manual, or to
products which have been altered or modified. This warranty
does not extend to products which have had the serial number
removed, altered, defaced, or rendered illegible.
(7) Physically damaged products are not covered by this
warranty and will be returned as received without repair.
13ADCOM GFA-6006/02 Owner’s Manual |
15ADCOM GFA-6006/02 Owner’s Manual |
GFA-6002 Specications
Power Rating (To IEC/CEA-490A Requirements)
70 Watts continuous average power into 8 ohms at any frequency between 20Hz and 20kHz with all channels driven
at less than 1.0% THD.
100 Watts continuous average power into 4 ohms at any frequency between 20Hz and 20kHz with all channels driven
at less than 1.0% THD.
Bridged Power: 175 Watts continuous average power (one channel) into 8 ohms at any frequency between 20Hz and
20kHz with at less than 1.0% THD.
IM Distortion (SMPTE)
1 watt to 70 watts into 8 ohms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ≤ 0.05%
IM Distortion (CCIF, Any Combination from 4kHz to 20kHz)
70 watts into 8 ohms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ≤ 0.01%
Frequency Response @ 1 Watt into 8 Ohms
10Hz to 20kHz. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +0, -0.25dB
Power Bandwidth (-3d B). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5Hz to 130kHz
Dynamic Headroom Into 4 Ohms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.8 dB
Signal to Noise Ratio, “A” Weighted
70 watts into 8 ohms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ≥ 100dB
Gain. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29dB
Input Sensitivity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . variable
Input impedance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17k ohms
Damping Factor
2OHz to 2OkHz. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ≥ 400
Rise Time
5kHz, 90V, peak-to-peak square wave, 20% to 80%. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.7µS
Power Consumption (Continuous, All Channels Driven)
Quiescent. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30VA
Maximum. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 600VA
General
Power (available in 230VAC by special order). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115VAC—50/6OHz
Chassis Dimension. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3” (76.2mm) x 17” (432mm) x 11.5” (292.1mm)
Maximum Dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.5” (88.9mm) x 17” (432mm) x 12.5” (317.5mm)
Weight. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 lbs. (8.2kg)
Weight, Packed. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 lbs. (9.5kg)
| ADCOM GFA-6006/02 Owner’s Manual14
GFA-6006 Specications
Power Rating (To IEC/CEA-490A Requirements)
70 Watts continuous average power into 8 ohms at any frequency between 20Hz and 20kHz with all channels driven
at less than 1.0% THD.
100 Watts continuous average power into 4 ohms at any frequency between 20Hz and 20kHz with all channels driven
at less than 1.0% THD.
Bridged Power: 175 Watts continuous average power (one channel) into 8 ohms at any frequency between 20Hz and
20kHz with at less than 1.0% THD.
IM Distortion (SMPTE)
1 watt to 70 watts into 8 ohms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ≤ 0.05%
IM Distortion (CCIF, Any Combination from 4kHz to 20kHz)
70 watts into 8 ohms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ≤ 0.01%
Frequency Response @ 1 Watt into 8 Ohms
10Hz to 20kHz. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +0, -0.25dB
Power Bandwidth (-3d B). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5Hz to 130kHz
Dynamic Headroom Into 4 Ohms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.8 dB
Signal to Noise Ratio, “A” Weighted
70 watts into 8 ohms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ≥ 100dB
Gain. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29dB
Input Sensitivity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . variable
Input impedance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17k ohms
Damping Factor
2OHz to 2OkHz. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ≥ 400
Rise Time
5kHz, 90V, peak-to-peak square wave, 20% to 80%. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.7µS
Power Consumption (Continuous, All Channels Driven)
Quiescent. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45VA
Maximum. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1440VA
General
Power (available in 230VAC by special order). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115VAC—50/6OHz
Chassis Dimension. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.75” (120.7mm) x 17” (432mm) x 14.5” (368.3mm)
Maximum Dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.25” (133.4mm) x 17” (432mm) x 15.5” (393.7mm)
Weight. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 lbs. (15kg)
Weight, Packed. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 lbs. (17.2kg)
15ADCOM GFA-6006/02 Owner’s Manual |
ADCOM
A division of Klein Technology Group, LLC
8541 East Anderson Drive
Scottsdale, Arizona 85255
Voice: (480) 607-2277
Fax: (480) 348-9876
http://www.adcom.com
| ADCOM GFA-6006/02 Owner’s Manual16
GFA6002_06_manual_v1
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