Adcom GFA-555SE User Manual
GFA-555se
OWNER’S MANUAL
High-Current Power Amplifi er
Congratulations on your purchase of the Adcom GFA-555se
You have made a wise choice that will reward you with exceptionally accurate musical sound reproduction for
years to come. To realize the full potential of your new amplifi er, please read these operating and installation
instructions thoroughly before attempting to make any connections to it.
The GFA-555se is not only designed to reproduce the highest quality sound but also to deliver the greatest
possible value. It is our engineers’ passion for perfection that has enabled our components to be judged the
equivalent of others costing two, three, or even fi ve times as much. Our engineering team consistently strives
to develop and design products that will exceed your expectations. Our goal at Adcom is to let more consumers hear high-end quality sound without paying high-end prices.
All Adcom components are the result of a long-standing dedication to innovation, quality, simplicity, and value.
Adcom: We have the power — and now, so do you!
A VERTISSEMENT
DANGER D’ÉLECTROCUTION
NE PAS OUVRIR
WARNING: TO REDUCE THE RISK OF ELECTRIC SHOCK,
DO NOT REMOVE COVER (OR BACK);
NO USER-SERVICEABLE PARTS INSIDE;,
REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.
The lightning fl ash with arrowhead sym-
bol, within an equilateral triangle, is intended to alert the user to the presence
of uninsulated “dangerous voltage” within
the product’s enclosure that may be of
suffi cient magnitude to constitute a risk
of electric shock.
The exclamation point within an equilateral triangle is intended to alert the user
to the presence of important operating
and maintenance (servicing) instructions
in the literature accompanying the appliance.
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.
AVERTISSEMENT:POUR ÉLIMINER TOUT RISQUE
D’ÉLECTROCUTION, NE PAS OUVRIR LE COUVERCLE (OU
LA PARTIE ARRIÈRE). AUCUNE PIECE RÉPARABLE PAR
L’UTILISATEUR NE SE TROUVE À L’INTÉRIEUR. POUR
TOUTE INTERVENTION D’ENTRETIEN OU DE RÉPARATION
SE CONFIER AUX TECHNICIENS QUALIFIÉS.
La fl èche symbolisant l’éclair dans un
triangle équilateral a pour objet de tirer
l’attention de l’utilisateur sur le fait, qu’
il y a des “tensions dangereuses” nonisolées à l’intérieurde l’enceinte du
produit qui peuvent être suffi samment
importantes pour conduire au risque
d’électrocution.
Le point d’exclamation au sein d’un triangle équilateral a pour objet de tirer
l’attention de l’utilisateur sur le fait qu’
il y a des instructions de mise en service et d’entretien (de réparation) dans
les fi ches descriptives de l’appareil qui
doivent obligatoirement être respectées.
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TABLE OF CONTENTS
LETTER FROM THE ADCOM TEAM................. 2
SAFETY INFORMATION ............................ 4
DESCRIPTION OF UNIT
GFA-555se FEATURES ............................. 5
WARRANTY INFORMATION ......................... 5
INSTALLATION & HOOKUP
UNPACKING THE GFA-555se ........................6
INSTALLING THE GFA-555se ........................6
CONNECTING THE GFA-555se ......................7
STEREO/BRIDGED MONO INPUT/OUTPUT.............7-8
OPERATION
FRONT AND REAR PANEL DIAGRAMS ................9
DESCRIPTION OF UNIT: REAR PANEL ............10-11
DESCRIPTION OF UNIT: FRONT PANEL ............. 11
TROUBLESHOOTING
RESOLVING PROBLEMS ........................... 12
CARING FOR YOUR GFA-555se ................... 13
SERVICE INFORMATION .......................... 13
GFA-555se SPECIFICATIONS ................... 14-15
THE FOLLOWING PRECAUTIONS AND SAFETY INSTRUCTIONS
ARE REQUIREMENTS OF ETL AND ETLC SAFETY REGULATIONS
• 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.
• 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 fl ow of air around its heatsinks or through its
ventilation openings.
• The unit should be situated away from heat sources such as
radiators, heat registers, stoves, or other devices (including
other amplifi ers) 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 and during electrical storms.
• 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 qualifi ed 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 exhib-
its a marked change in performance; or
e. The device has been dropped, or the enclosure dam-
aged.
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/preamplifi er, be sure the antenna system is grounded so as to pro-
vide 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) alu-
minum, 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) cop-
per, or the equivalent, when a separate antenna grounding
electrode is used. See NEC Section 810-21 (j).
EXA MPLE OF AN TENNA GROUN DING AS PER NATIONA L ELECTRICAL CODE INSTRUCTIONS CONTAINED IN ARTICLE 810. RADIO AND TELEVISION EQUIPMENT.
WARNING
TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT
EXPOSE THIS UNIT TO RAIN OR MOISTURE.
AVERTISSEMENT
AFIN D’ÉVITER TOUT RISQUE D’INCENDIE OU D’ÉLECTROCUTION,
NE PAS EXPOSER CET APPAREIL À LA PLUIE NI À L’HUMIDITÉ.
CAUTION
TO PREVE NT ELECTRIC SH OCK DO NOT USE THIS P OLARIZED
PLUG WITH AN EXTENSION CORD, RECEPTACLE OR OTHER
OUTLET UNLESS THE BLADES CAN BE FULLY INSERTED TO PREVENT BLADE EXPOSURE.
ATTENTION
POUR PRÉVENIR LES CHOCS ÉLECTRIQUES NE PAS UTILISER
CETTE FICHE POLARISÉE AVEC UN PROLONGATEUR, UNE PRISE
DE COURANT OU UNE AUTRE SORTIE DE COURANT , SAUF SI LES
LAMES PEUVENT ÊTRE INSÉRÉES À FOND SANS EN LAISSER
AUCUNE PARTIE À DÉCOUVERT.
THERE AR E NO USER SERVICE ABLE PARTS IN THI S PRODUCT.
DO NOT ATTEM PT S ERVI CING O F TH IS UN IT YOUR SEL F. REFER
SERVICING TO QUALIFIED SERVICE PERSONNEL.
NOTE TO CATV SYSTEM INSTALLER
This reminder is provided to call the CATV system installer’s attention to Article 82022 of the National Electrical Code that provides guidelines for proper grounding and, in particular, specifi es
that the cable ground shall be connected to the grounding system
of the building, as close to the point of cable entry as practical.
NOTE TO AUDIO SYSTEM INSTALLER
WHENEVER CONNECTIONS TO OR FROM THE GFA-555SE ARE BEING
MADE, BE CERTAIN THAT THE AC ON/OFF SWITCH OF THE AMPLIFIER IS IN THE OFF POSITION, THE AC CORD OF THE AMPLIFIER IS
DISCONNECTED FROM THE AC WALL OUTLET AND THAT ALL ASSOCIATED COMPONENTS ARE OFF. Always make certain that the
amplifi er is disconnected from the AC outlet for at least fi ve min-
utes to ensure its fi lter capacitors are discharged before mak-
ing connections to and from the amplifi er. Failure to heed this
precaution may result in damage to the loudspeaker(s) and/or the
amplifi er which is not covered by the Warranty.
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GFA-555se FEATURES
• Precision-matched devices used throughout the signal path.
• 60,000 μF of power supply-fi lter capacitance for greater reserve capacity.
• 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 distortion LED for each channel.
• High quality, gold-plated 5-way binding posts.
• High quality, gold-plated RCA jacks.
• High quality, balanced XLR jacks.
• Large independent 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 effi ciency and cooler operation while driving low impedance
loads.
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 benefi ts. 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. A proof of purchase is required for all warranty service.
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