Adcom GFA-5400 User Manual

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details you can hear

G FA-5400

High Current

Power Amplifier

OWNER’S MANUAL

THE FOLLOWING PRECAUTIONS AND SAFETY INSTRUCTIONS

ARE REQUIREMENTS OF UL AND CSA SAFETY REGULATIONS

Warning: To reduce the risk of fire or electric shock, do not expose
this unit to rain or moisture.

CAUTION

RISK OF ELECTRIC SHOCK

DO NOT OPEN

'I

A

AVIS: RISQUE DE CHOC ELECTRIQUE-NE PAS OUVRIR

The graphic symbol of a lightning flash with an arrow
point within a triangle signifies that there is dangerous
voltage within the unit and it poses a hazard to anyone

A

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 flow 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 amplifiers) 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.

removing the cover to gain access to the interior of the
unit.Only qualified 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 man
ufacturer's instructions, and should use a mounting ac
cessory recommended by the manufacturer.

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 AU
CUNE PARTIE À DÉCOUVERT

CAUTION

TO PREVENT ELECTRIC SHOCK DO NOT USE THIS POLARIZED PLUG
WITH AN EXTENSION CORD. RECEPTACLE OR OTHER OUTLET UN
LESS THE BLADES CAN BE FULLY INSERTED TO PREVENT BLADE
EXPOSURE.

CAUTION

Any outdoor antenna must be located away from all power lines.

POWER LINES

OUTDOOR ANTENNA GROUNDING

If an outside antenna is connected to your tuner or tuner-preamplifier, 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. 70-1984, 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 mm") copper. No.8 AWG (8.4 mm") aluminum,
No.17 AWG (1.0 mm") 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 4-6 feet (1.22-1.83 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 mm") 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

POWER LINES

STANDOFF
INSULATORS, b

ANTENNA
LEAD-IN WIRE

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 qualified 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 unif does not apptear 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.

EXTERNAL ANTENNA

POWER SERVICE GROUNDING
ELECTRODE SYSTEM
(e. g. interior metal water pipe)

BONDING JUMPER, d

OPTIONAL ANTENNA GROUNDING
ELECTRODE DRIVEN B FEET (2.44 M) INTO
THE EARTH IF REQUIRED BY LOCAL
CODES SEE NEC SECTION 810-21 (f)

NOTE TO CATV SYSTEM INSTALLER

This reminder Is provided to call the CATV system installer’s attention to
Article 820-22 of the National Electrical Code that provides guidelines for
proper grounding and, in particular, specifies that the cable ground shall be
connected to the grounding system of the building, as close to the point of
cable entry as practical.

EHMINALS OF RADIO RECEIVER

GROUND WIRE, a.b

GROUND CLAMPS

Congratulations on your decision to purchase the GFA-5400 Stereo Power Amplifier. You have made a wise choice
that will reward you with exceptionally accurate and musical sound reproduction for years to come. To realize the full potential
of your new amplifier, please read these operating and installation instructions thoroughly before attempting to connect it.

FEATURES

• Precision matched MOSFETs used throughout the signal path.

• Over 50,000 pF of power supply filter capacitance with low ESR for greater reserve capacity.

• Low number of gain stages improves signal reproduction accuracy.

• Custom toroidal power transformer provides better regulation and greater peak current capability.

• High quality, gold plated binding posts.

• Independent thermal overload and distortion LEDs for each channel.

• Gold plated RCA jacks.

• Large 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 on top cover for greater efficiency 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 benefits. 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, 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.

UNPACKING

Before your new GFA-5400 left our factory, it was carefully inspected for physical imperfections and tested for all
electrical parameters as a routine part of ACCOM’s systematic quality control. This, along with full operational and mechanical
testing, should ensure a product flawless in both appearance and performance. After you have unpacked the GFA-5400,
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 amplifier 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 NOTIFIED
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.

INSTALLING THE GFA-5400

During normal home operation the internal heatsinks of the GFA-5400 may become warm. However, there are
instances during high-level playback into low impedance when the heatsinks will become much warmer than usual. To ensure
the amplifier’s long-term, trouble-free operation it is necessary to provide adequate ventilation for the heatsinks. Therefore, the
GFA-5400 should be kept away from external sources of heat such as radiators and hot-air ducts. The GFA-5400 should never
be placed with other heat-producing components in a cabinet or enclosure lacking free airflow.

If you require that the GFA-5400 be mounted in an enclosed cabinet, it is recommended that the rear panel of the
cabinet be provided with ventilation openings at the top and bottom to allow air to circulate freely in the cabinet. The top and
bottom panels of the amplifier’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-5400. This is particularly important if your
system includes low-impedance loudspeakers that are difficult to drive or if you will consistently demand high volume levels

from the amplifier and speaker system. Heat generated by the amplifier will not only affect the performance of equipment
stacked on top of the GFA-5400, but the free flow of air through the ventilating slots in the amplifier may be partially obstructed.

If you observe these recommendations, the GFA-5400 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, heatsinks, panels and around the ventilating slots should be all that is required.

The optimal performance of your new GFA-5400 will ultimately depend on the care with which you make the
connections between the amplifier, preamplifier 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 following relevant sections.

^IGHT/LEFT INPUT O

The audio inputs to the GFA-5400 are through two high quality, goid piated RCA jacks to minimize high frequency
losses, noise. Etc. They will accept standard RCA type plugs, one for each channel, LEFT and RIGHT. To ensure that the
performance designed into the GFA-5400 is realized, you should use the highest quality cables feasible. Whatever cable you
finally select, it should have low capacitance. This is particularly important if you use a long run between the preamplifier and
amplifier. Generally speaking, a cable with a capacitance of less than 100 pF will work best.

The load impedance which the GFA-5400 inputs present to the source preamplifier or tuner-preamplifier is 49.9k
ohms. This load impedance results in minimal amplifier noise when used with a source component of low output impedance
such as an ADCOM preamplifier or tuner/preamplifier. To preserve the correct stereo image, please be certain to connect the
left output of the preamplifier or tuner-preamplifier to the RCA jack on the GFA-5400 labeled LEFT INPUT and the right output
of the source component to the RIGHT INPUT jack.

RIGHT/LEFT OUTPUT ©

The GFA-5400 is ''polarity correct" and does not invert phase. That is, any positive going signal at its input will appear

WARNING

Whenever connections to or from the GFA-5400 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 turned off.

as a positive going signal at its output. The GFA-5400’s connections to the loudspeakers are made through two high quality,
five-way, gold plated binding posts located on the rear panel. These terminals will accommodate bare wire, tinned wire, terminal
pins, spade lugs or banana plugs, both single and dual. These output terminals are color coded RED and BLACK to indicate
polarity. To ensure correct stereo phasing, you must connect the RED output terminal (labeled “+”) to the loudspeaker input
terminal color-coded RED (or labeled POSITIVE,POS, 8 OHMS or 4 OHMS). The BLACK binding post terminal on the
amplifier (labeled should be connected to the loudspeaker input terminal color-coded BLACK (or labeled NEGATIVE,
NEG, C, COMMON, G, or GROUND).

The RIGHT OUTPUT should be connected to the right channel loudspeaker, as you face the pair of loudspeakers, and

the LEFT OUTPUT to the left channel loudspeaker.

In order to ensure that connections to the loudspeakers are correct, you must be able to identify each wire conductor

of the loudspeaker cables at both ends of the cables. This is relatively easy to do since most loudspeaker cables consist of two
parallel, stranded conductors in a flexible insulation, with a coding system for wire identification. Sometimes there is a colored
"tracer” wrapped around one of the conductors; some cables have one of the conductors colored silver and the other copper;

some have a "ridge” molded on the insulation of one of the conductors, while others are imprinted with and/ormarkings.

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ADCOM

10 Timber Lane

Marlbom NJ 07746 USA

Model GFA-5400

Power. 115VAC

Frequency: 50-60Hz
Power ConsumpHon(max): 960W

ADCOM Marque Deposee

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/A

CAUTION' Tn pmvnnt alaririn .«hof*. Ho not removo coiw Ato
used serviceatile parts inside. Refer servKing to quaUfied
personnel. For continued protection against lire nazard,
replace only with same type and rating fuse Disconnect A C
supply cord befor charing fuse.
WARNING: To reduce the risk of fire or elecinc snock. do not
expose this equipment to rain or moistire

left input

GFA-5400 Rear Panel Diagram

Generally speaking, when making connections to the loudspeakers from the amplifier it is very important to use the
correct type and size of wire in order to avoid unnecessary loss of amplifier power in the cable, reduction of amplifier damping
factor and other undesirable conditions. For runs up to twelve feet, ordinary “zip” or lamp cord, made up of AWG18 stranded
wire and available in a variety of insulation colors may be used. For runs up to forty feet, AWG16 stranded wire should be used
as a minimum to prevent power losses. For lengths over forty feet and not exceeding sixty feet, use at least AWG14 stranded
wire. Runs exceeding sixty feet require the use of heavier conductors such as AWG12.

There are several different ways to connect the wiring to the RIGHT and LEFT OUTPUTS. The methods used will
depend on the specific type of connectors supplied with the loudspeakers, the speaker cables, etc. As a matter of course, we
prefer the use of banana plugs, generally it is the most secure method of connection. Also, the springs of the banana plugs
create a self-cleaning action, which ensures the best contact between the binding posts and the connectors themselves. There
are “sockets” provided in the center of the binding posts’ studs which permit secure seating of the banana plugs. Before
inserting the banana plug into the binding post, ensure the binding post is securely hand tightened in a clockwise direction.

Additionally, when connecting the cables to the amplifier and loudspeakers, it is important that you “tin” the wires with
good quality electronic solder in order to minimize contact resistance. Tinning prevents the buildup of surface compounds,

which can form on copper wire and increase its centact resistance.

If you prefer to use other methods of connection, unscrew the insulated head of the binding post until the hole in the
binding post stud is accessible. You can then insert the bare or tinned wire, or terminal pin, through the hole. You can also use
the many variety of spade lugs available by simply placing the tines of the spade lug onto the binding post stud. Turn the
insulated head of the binding post clockwise until the wire or connector is firmly secured. Finger pressure is sufficient and you
should not use pliers or other tools, which could damage or over tighten the binding post assembly. The binding post has been
designed in such a way that finger pressure is all that is required to cause a “pinching” action among the different metal
surfaces to ensure proper connection.

All loudspeakers having nominal impedance down to 4 ohms can be connected to, and driven by the GFA-5400. The
amplifier can drive these low impedance at more than adequate power levels with no difficulty. It should be noted here that
many loudspeaker systems which are nominally rated at 4 ohms, in actuality drop in impedance, in some areas of their

frequency range, to below 2 ohms. You should not experience difficulties even with these very low impedance loads unless

you demand excessively high volume levels from the system.

In most applications, you can drive two or more sets of loudspeakers. You should note, however, that when
loudspeakers are run in parallel, the impedance presented to the amplifier is lower than the nominal impedance of each
loudspeaker. In other words, if you parallel two 8 ohm sets of loudspeakers, the resultant impedance presented to the amplifier

will be 4 ohms. If 8 ohm and 4 ohm loudspeakers are paralleled, the resultant impedance will be approximately 2.6 ohms. In
this last situation, depending upon the lowest impedance of the nominally 4 ohm speakers, and if excessive power demands
are placed on the amplifier, you may trigger the THERMAL PROTECTION on the amplifier. See its respective section for more

information. For convenient switching of multiple sets of speakers with impedance protection for the amplifier, you should
consider the use of an ADCOM speaker selector. These are available from your local ADCOM dealer.

AC LINE CORD ©

The AC cord provides power to operate all the GFA-5400’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 of the GFA-5400.

The GFA-5400's power cord is supplied with a “polarized” AC plug as required by UL/CSA standards and the National
Electrical Code. To minimize the risk of electrical shock and to ensure minimal hum from the system, do not defeat the polarity
ensuring feature of the plug (one wide blade and one narrow blade). To prevent electrical shock, do not use this polarized plug

with an extension cord or other outlet unless the blades can be fully inserted to prevent blade exposure.

AC POWER FUSE O

The AC POWER FUSE protects the electronic circuits of the GFA-5400. This fuse will normally blow only if there is an

overload within the GFA-5400. For continued protection of the electronic circuit the fuse should only be replaced with a fuse of
the same type and value as printed on the rear panel of the amplifier.

If turning on the amplifier does not cause the POWER LED to glow, this may indicate that the AC POWER FUSE is
blown. Unplug the AC LINE CORD from the AC wall outlet and turn the AC ON/OFF SWITCH off and check the fuse. If the

fuse is blown, replace it only with one of the same type and value as printed on the rear panel of the amplifier. If, after

replacing the fuse, it blows immediately upon turning on the amplifier (POWER LED does not glow), a failed electronic

component or other internal problem must be suspected. Make no further attempts at fuse replacement or operation of the
amplifier. Refer the problem to competent ADCOM authorized service personnel.

To remove a blown or suspect fuse from its holder, use only a # 2 Phillips screwdriver to prevent damage to the fuse
holder. Simply press lightly on the fuse holder cap and turn counterclockwise. The cap will pop out after a quarter turn. Once
a new fuse has been installed in the fuse holder cap, insert it into the fuse holder body and press lightly while turning the cap
clockwise until it is firmly seated. Be certain not to cause cross threading of the fuse holder body and cap to prevent damage to
the fuse holder. DO NOT FORCE THE FUSE HOLDER CAP INTO THE THREADS.

WARNING!

Before attempting to check or replace a blown fuse, be certain to unplug the AC line cord from the AC wall outlet to
prevent possible electrical shock.

Replace the AC POWER 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 amplifier circuits, MAY CREATE A FIRE HAZARD, AND MAY VOID THE WARRANTY.

AC POWER FUSE For 115 Volt operation: 8 AMP AGC/250V

AC POWER FUSE For 230 Volt operation: 4 AMP AGC/250VAC

ON/OFF SWITCH ©

The AC ON/OFF SWITCH controls power to the power transformer circuits of the GFA-5400, Whenever the GFA­5400 is energized the POWER LED will glow. Depress the push button switch to energize the GFA-5400. Press the switch
again to turn the amplifier off.

POWER LED ©

This LED will glow whenever the AC ON/OFF switch is turned on and the GFA-5400 is energized. The POWER LED
indicates that there is AC voltage being fed to the amplifier, but it does not signify that the entire amplifier’s circuits are in

operation. If, for example, the THERMAL PROTECTION LED glows, the amplifier 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 amplifier is
subjected to abnormal conditions, such as operation into loads of less than 3 ohms at very high listening levels, etc. If the AC

POWER FUSE is not blown, the POWER LED is out, and the THERMAL PROTECTION LED is lit, 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.

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5400 Front Panel Diagram

INSTANTANEOUS DISTORTION ALERT LEDs O

The INSTANTANEOUS 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 INSTANTANEOUS DISTORTION ALERT

LEDs will light when distortion reaches 1% regardless of impedance, voltage/current phase angle or the reactance of the
loudspeakers which the amplifier is driving. Sometimes, when the amplifier is in use, the LEDs may occasionally flicker during
high volume listening, particularly if you are driving low impedance loads. This flickering is no cause for concern. The LEDs
are simply warning you that the amplifier is approaching its maximum power output into the particular loudspeakers you are

using. If, however, the INSTANTANEOUS DISTORTION ALERT LEDs glow brightly or are illuminated most of the time during

playback, you are overdriving the amplifier and should turn down your volume control to reduce the listening level. If not,
excessive level may cause the THERMAL PROTECTION to be activated or, in extreme cases, damage your loudspeakers.

THERMAL PROTECTION LEDs O

The GFA-5400 is provided with a thermal protection circuit, which will shut down the amplifier if either heatsink's
temperature reaches 85°C. The THERMAL PROTECTION LEDs will light whenever the thermal protection circuit on its
respective channel has been triggered and the amplifier is inoperative. The thermai protection circuitry will typically be
triggered by very high power demands into impedance much lower than the amplifier is capable of driving at those levels. If
either amplifier channel’s output through the loudspeaker(s) ceases abruptly, and one or both of the THERMAL PROTECTION
LEDs glow, you will know that its heatsink temperature has become unacceptably high and the circuitry is protecting the
amplification devices. Please note that the POWER LED will remain on and the amplifier will still be energized. Once the
temperature of the heatsink(s) drops to a safe operating level, the amplifier will automatically resume operation.

Activation of the thermal protection circuitry in the GFA-5400 is an indication that the amplifier has been overdriven or
that the load the loudspeakers are presenting to the amplifier is unreasonably low. If you wish to prevent recurring 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, or both internal protection fuses may blow.

CARING FOR YOUR GFA-5400

Great care has been taken by ADCOM to ensure that your amplifier is as flawless in appearance as it is electronically.
The front panel is a heavy gauge, high-grade aluminum extrusion carefully finished and anodized for durability. The chassis,
top cover and rear panels are heavy gauge steel, that has been powder coated and baked to ensure a lasting finish. If the front
panel, top or sides become dusty or finger printed, they can be cleaned with a soft lint free cloth, slightly dampened with a very
mild detergent solution or glass cleaner.

WARNING!

Do not spray or pour liquids of any kind on the GFA-5400.

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 be helpful if you indicate which major city is accessible to your home.

Please address mail inquires to:

ADCOM Service Corporation
10 Timber Lane
Marlboro, NJ 07746 USA

For Fax inquires, please include a return Fax number for the reply. When calling or writing about your GFA-5400, 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. It is helpful 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.

Monday through Friday

Phone, Fax or E-mail inquires to:

Tel.: [phone]
Fax: [phone]

9:00 AM to 5:00 PM EST
[e-mail]

FREIGHT COLLECT SHIPMENTS WILL NOT BE ACCEPTED

UNDER ANY CIRCUMSTANCES.

GFA-5400 SPECIFICATIONS

Power Rating (To FTC Requirements)

125 watts continuous average power into 8 ohms: 20Hz and 20kHz with both channeis driven at iess than 0.18% THD

200 watts continuous average power into 4 ohms: 20Hz and 20kHz with both channels driven at iess than 0.18% THD

IM Distortion (SMPTE)

1 watt to 125 watts into 8 ohms.........................................................................................................................................................................< 0.05%

1 watt to 200 watts into 4 ohms.........................................................................................................................................................................< 0.05%

IM Distortion (CCIF, Any Combination from 4kHz to 20kHz)

125 watts into 8 ohms.......................................................................................................................................................................................< 0.035%

200 watts into 4 ohms....................................................................................................................................................................................... < 0.035%

THD + Noise at 125 watts into 8 ohms (Typical)

20Hz........................................................................................................................................................................................................................0.018%

1kHz......................................................................................................................................................................................................................... 0.02%

10kHz....................................................................................................................................................................................................................... 0.07%

20kHz........................................................................................................................................................................................................................0,14%

THD + Noise at 200 watts into 4 ohms (Typical)

20Hz......................................................................................................................................................................................................................... 0.018%

1kHz...........................................................................................................................................................................................................................0.02%

10kHz.........................................................................................................................................................................................................................0.08%

20kHz........................................................................................................................................................................................................................0.165%

Frequency Response @ 1 Watt into 8 ohms (10Hz to 20kHz)......................................................................................................................................+0, -0.25dB

Power Bandwidth (-3dB).........................................................................................................................................................................................3Hz to 130kHz

Dynamic Headroom into 4 ohms........................................................................................................................................................................................................1 7dB

Signal to Noise Ratio, “A” Weighted (125 watts onto 8 ohms).......................................................................................................................................... > lOOdB

Gain...........................................................................................................................................................................................................................................29 dB

Input Impedance.........................................................................................................................................................................................................49.9K ohms

Input Sensitivity

for 1 Watt output....................................................................................................................................................................................................0.1 volts

for 125 Watts output........................................................................................................................................................................................................1.125 volts

Damping Factor (20Hz to 20kHz)...............................................................................................................................................................................................> 500

Rise Time (5kHz, 90 V peak-to-peak square wave, 20% to 80%)........................................................................................................................................ 1.9 uS

Power Consumption (Continuous, Both Channels Driven)

Quiescent...................................................................................................................................................................................................................150VA

Maximum..................................................................................................................................................................................................................960VA

125 watts into 8 ohms..............................................................................................................................................................................................580VA

200 watts into 4 ohms.............................................................................................................................................................................................’.920VA

Power (Available in 230VAC by special order)..............................................................................................................................................115VAC - 50/60HZ

Chassis Dimensions..................................................................................................................................5” (127mm) x 17” (432mm) x 11 Vi” (292mm)

Maximum Dimensions.......................................................................................................................... 5V (137mm) x 17” (432mm) x 12)4” (375mm)

Weight................................................................................................................................................................................................................... 26 lbs. (11.8kg)

Weight, Packed.....................................................................................................................................................................................................30 lbs. (13.6kg)

/DCOM

10 Timber Lane

Marlboro, NJ 07746

Tel: [phone]
Fax; 732-683-9790

www.adcom.com Printed in the USA GFA54/98/V.1.2