Adcom GFA-780X, GFA-7807, GFA-7805 User Manual
OWNER’S MANUAL
GFA-7805
& GFA-7807
Multi-channel High-Current Power Ampliers
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 amplier in action, but please take a few minutes
to read this owner’s manual before connecting the amplier to your system. Because ADCOM
ampliers can put out tremendous power, it is particularly important that you connect your
amplier to your pre-amplier and speakers while the amplier is unplugged and your other
equipment is turned off. This will protect the amplier and other equipment from potential short
circuits that may occur during installion. In addition, it is important that you allow for adequate
ventilation around your amplier and other equipment, since excessive heat buildup can shorten
the life of any electronic product, including the amplier. Once you have correctly connected
your pre-amplier and speakers to your new amplier, you should be able to enjoy many troublefree years of performance.
We conduct a thorough quality and performance test on each and every amplier we build in our
factory prior to shipment. In the rare case of a defect that may occur after shipment, we stand
behind our ampliers with a ve-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 sound and performance of your new amplier. We
hope you will also consider other ADCOM products, such as our line of pre-ampliers and DVD
and CD players. In addition, we design and manufacture complementary products such as line
conditioners/surge suppressors and speaker selectors. Please visit our web site, 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
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TABLE OF CONTENTS
WELCOME ..... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
SAFETY INFORMATION .. . . . . . . . . . . . . . . . . . . . . . . . . . 4
DESCRIPTION OF UNIT
GFA-7805 FEATURES . . . . . . . . . . . . . . . . . . . . . ......... 5
GFA-7807 FEATURES . . . . . . . . . . . . . . . . . . . . . ......... 5
WARRANTY INFORMATION . . . . . . . . . . . . . . . . . . . . . .... 5
INSTALLATION & HOOKUP
UNPACKING THE GFA-7805/7807 ................ . . 6
INSTALLING THE GFA-7805/7807 . . ................ 6
OPERATION
FRONT AND REAR PANEL DIAGRAMS ........ . . . . . . . . 7
DESCRIPTION OF UNIT: REAR PANEL .. . . . . . . . . . . . .. 8
DESCRIPTION OF UNIT: FRONT PANEL ............ 8-9
CONNECTIONS DIAGRAM ........ . . . . . . . . . . . . . . . . . 10
CONNECTING THE GFA-7805/7807 ..... . . . . . . . . . . . 11
TROUBLESHOOTING
RESOLVING PROBLEMS .. . . . . . . . . . . . . . . ........... 12
CARING FOR YOUR GFA-7805/7807 ....... . . . . . . . . 13
SERVICE INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . 13
GFA-7805 SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . 14
GFA-7807 SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . 15
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 ELECTR IC SHOC K
DO N OT
OPEN
CAUTION
RISK OF ELECTR IC SHOC K
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.
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.
GFA-7805 FEATURES
• Precision-matched devices used throughout the signal path
• 112,000 µF of power supply-lter capacitance to optimize transient response
• 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 5 channels
• High quality, gold-plated 5-way binding posts
• Balanced XLR inputs
• High quality, gold-plated RCA jacks
• Large independent internal heatsinks for greater cooling capability of output devices
• Convenient 12V DC power ON/OFF triggering
• 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
• Forced convection temperature sensitive cooling
GFA-7807 FEATURES
• Precision-matched devices used throughout the signal path
• 156,800 µF of power supply-lter capacitance to optimize transient response
• 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 7 channels
• High quality, gold plated 5-way binding posts
• Balanced XLR inputs
• High quality, gold-plated RCA jacks
• Large independent, internal heatsinks for greater cooling capability of output devices
• 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
• Forced convection temperature sensitive cooling
ADCOM PROTECTION PLAN (USA Only)
ADCOM offers the enclosed valuable Limited Warranty. Please read the details on the Warranty Card carefully to
understand the extent of the protection offered by the Warranty, its reasonable limitations, and what you should
do in order to obtain its benets. Be sure to verify that the serial number printed on the rear panel matches the
serial number on the outer carton. If any number is altered or missing, or if the ADCOM Warranty Card is not
included in the carton, you should notify us immediately in order to ensure that you have received a genuine
ADCOM product which has not been opened, mishandled, or tampered with in any way. Always retain your
original sales receipt as a proof of purchase.
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