Adcom GFA-555 PRO Owner's Manual page 7

SECTION 6
WHY WE BUILT IT THE WAY WE DID
The ADCOM GFA-555 represents a departure from many of the other amplifier designs currently available.
ThhrUeparture is the result of a careful study of all known amplifier teclmology, circuits and parts. The mam feature
of the GFA-555 is its outstanding ability to drive the vast majority of speakers to high sound levels while maintaining
the sonic integrity of the music.
The Instantaneous Distortion Alert is a unique distortion detecUon circuit which reads all forms of distortion
_ THD, IM, Slew Induced, and DC-Offset. Peak LEDs, one per channel, will glow when distortion is above 1% regardless
of the load impedance or reactance. In use, the LEDs may occasionally flicker under high volume listening. If they
glow brightly or are on most of the time that you are listening, you are over-driving your equipment and should turn
down your volume control.
We consider the GFA-555 to be a truly significant contribution to the advancement of sound technology.
To ensure that the quality of construction is on par with the quality of the sonics, (a much neglected area in many
other amplifiers) the GFA-555 has been carefully developed with computer controlled metal fabrication techniques
that maintain 0.005 of an inch tolerances throughout. Full electrical inspection of each and every circuit board,
subassembly, as well as the finished amplifier, provide a mechanically and sonically superior product for your
enjoyment. At the time of its design, we know of no other product on the market which offered the design and
construction quality of die GFA-555 at anything close to its selling price. We sincerely hope that you'll agree.
SECTION 7
THE CARE AND FEEDING OF YOUR GFA-555
Great care has been taken by ADCOM to assure that your amplifier is as flawless in appearance as it is
electronically. The front panel is heavy gauge, high-grade anodized aluminum. If the front panel should become
fingerprinted or smeared, it can be cleaned with a damp, soft cloth.
UNDER NO CIRCUMSTANCES SHOULD A STRONG OR ABRASIVE CLEANER SUCH AS
SCOURING POWDER OR OVEN CLEANER BE USED ON ANY PART OF THE AMPLIFIER.
Hie amplifier is protected by a line fuse on the rear panel. If the power is switched ON and the small red
LED on the front panel does not illuminate after a few seconds, shut off the amplifier, unplug the AC line cord from
the power outlet, and check the AC line fuse. If the fuse has opened, replace it ONLY with a fuse of equal value.
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