due to the high power surge em itted from the am p lifier.
XL is e s s e n tia l to follo w the procedure of com pletely hooking up your system
before turning anything on! A few sim ple precautions w ill contribute to trouble
free pcrfortnance. Because of the high power of the GFA-555, ADCOM w ill not be
resp o n sible for any damage to speakers or other components due to th eir inability
to handle the a m p lifie r 's power output or for any other m isuse.
SECTION 5
WHY WE BUILT IT THE WAY WE DID
The ADCOM GFA-555 rep resents a departure from many of the other currently
av a ilab le a m p lifier d esig n s, This departure is the r e su lt of careful study of a l l
known am plifier technology, c ir c u its and p a rts. The major feature of the GFA-555
is i t s outstanding a b ility to drive v ir tu a lly any speaker, regardless of impedance,
to high sound le v e ls w hile m aintaining the sonic in te g rity of the music. By using
a 700 watt transform er along with 60,000 microfarads of f i l t e r capacitance, the
GFA-555 can provide continuous power, not only momentary power for demanding
m usical tra n sien ts. A lso to n trib u tin g to the outstanding performance is the use
of 16 high-current output tr a n sisto r s along with p recision p arts sele ctio n of the
components used in a ll audio c ir c u its ,
The Instantaneous D isto rtio n A lert c ir c u it is a unique d isto rtio n d etection
c ir c u it which reads a l l forms of d isto r tio n — THD» IM, slew induced, and DC o ffs e t.
Peak LEDs, one per channelj w ill glow when d isto rtio n is over 13 regardless of
the load impedance or reactance. In u se, the LED can occasion ally flic k er under
high volume liste n in g . I f they §low b righ tly or are on most <?f the time that you
are lis te n in g , you are overdriving your equipment and should turn down your volume
co n trol.
We consider the GFA-555 a tru ly sig n ific a n t con trib ution to the advancement
of sound technology. To ensure th at the qu ality of constru ction is on par with the
qu ality of so n ics, (a much n eglected area in many other a m p lifiers) the GFA-555 has
been carefu lly developed w ith computer con trolled metal fab rication techniques thac
maintain ,005 of an inch toleran ce throughout. F u ll e le c tr ic a l insp ection o! each
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