Adcom GFA-555 User Manual

ADCOM

P C W E R 4 M P

G F k - 5 5 5

ADCOM GFA-555 OWNERS MANUAL

WELCOME

It ia very important chat you thoroughly read th is owners manual b efote
turning your ADCOM GFA-555 power am p lifier on. (For those In a hurry* please
read S ections 1 -5 ).

Your ADCOM GFA-555 rep resents the most advanced th inking In audio am plifier
design . At 200 wacte per channel, the GFA-555 offe rs an exceptional value;

superior performance at a reasonable p rice. Some of the outstanding featu res of
th is product are:

- 200 w atts per channel* 20UZ-20KU2 * in to an 8 ohm load with both channels

driven with less than 0.09% t o ta l harmonic d is to r tion .

- 325 w atts per channel, 20Ha-20KHz, into a A ohm load w ith both channels

driven with less than 0.25% to t a l harmonic d is to rtio n .

- The a b ilit y to d rive very low impedance loads.

- Bridged mode power of 600 w a tts, 20Hz~20KH2, in to art 8 ohm load with le ss

than 0.25!? to ta l harmonic d isto rtio n .

- Instantaneous D istortion A lert which in d icates whenever d istortion products

are above the 1 % lev e l.

This manual has been w ritten to a n tic ip a te the kinds of q uestions you
might encounter w hile enjoying the f u ll b e n efits of your ADCOM GFA-555 power

am plifier. Please read i t thoroughly to fu lly understand a l l the fea tures offered
and how they can be used to maximize the performance of your audio system*

SECTION 1

WHAT TO DO WHEN YOU OPEN THE BOX

Before each GFA-555 l e f t the fa cto ry , it was ca r efu lly Inspected for
phy sical im perfections as a routine part of ADCOM's system atic q u ality control.
This, along w ith f u ll e lectr'ic a l te stin g , should insure a product fla w less in
both appearance and performance. After you have unpacked the a m plifier, inspect

it for any p h ysical damage. Save the ship ping carton and a ll packing m ateria ls
as they are ess e n tia l to reduce to a minimum the p o s s ib ility o f transportation
damage 3hould the product ever need to be shipped again. In the u nlikely event

that damage has occurred, n otify your dealer immediately and request the name

of the carr ier so that a w ritten claim to cover shipping damages can be in itia te d .

THE RIGHT ID ANY CLAIM AGAINST A PUBLIC CARRIER GAB BE FORFEITED IF THE

CARRIER IS NOT NOTIFIED FRQMPTLY AND IF THE SHIPPING CARTON AND PACKING MATERIAL
ARE NOT AVAILABLE FOR INSPECTION. SAVE ALL PACKING MATERIALS UNTIL THE CLAIM
HAS BEEN SETTLED.

SECTION 2

WHERE TO PUT IT (AWD WHERE NOT TOt)

The GFA-555 u tiliz e s large ex ter nal h eat sink s to d issip a te heat from the
power tra n sisto rs . The top and bottom panels o f the am p lifier have slo ts to allow
air to c irculate in aide the a m p lified, Adequate a ir c ircu la tio n must be av ailab le

to assure cool operation of the amp. Therefore, the GFA-555 should not be complete

enclosed with other heat producing components, and adequate space around the amp

lif ie r should be m aintained. We recommend a t le a st 3 inches on the top and I inch

on the sid e s and rear for air c ircula tio n . I f the GFA-555 i s going co be mounted
in an enclosed ca binet, it is recommended that the back o f the cabinet have vents

to allow air to c ircu late around the a m plifier. With these consideration s in mind,
the GFA-555 should perform quite happily in arty reasonable environment. Of course,
such normal considerations as p ro tection from excessive dust and m oisture should

always be observed. The ADCOM GFA-555 power am p lifier has been c are fu lly designed