Adcom GFA-7705 User Manual

Introduction
Congratulations on your decision to purchase the GFA-7705/07 multi-channel power amplifier. The GFA-7705/
07 integrates very well with any other home theater system, such as Dolby ProLogic ™ or Dolby Digital ™ 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 make any connections to it.
ADCOM Protection Plan (NORTH AMERICA ONLY)
ADCOM offers the enclosed valuable Limited Warranty. Please read the details on the Warranty Card carefully
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. Always retain your original sales receipt as a proof of purchase.
Description of Unit
The GFA-7705/07 is a 20-Amp Device.
GFA-7705/07 is high-power, high-current, wide-bandwidth design employing ADCOM’s Fast Analog Transform
(F.A.T.) circuitry with direct-coupled Power Rig output stages. All channels are completely monaural from
transformer secondaries through the output stages.
In order for this product to achieve its actual rated power output on all channels and to avoid repeatedly
throwing/popping the related electrical service panel circuit breaker, it is critical that the amplifier be
professionally installed on a 20-Amp household AC circuit and outlet, preferably dedicated but at minimum one
not shared with other large current-draw appliances or devices.
Common 15-Amp household circuits are easily and inexpensively converted to 20 Amp configuration by any high
voltage licensed electrician. 5 y 1 s
For this reason, the GFA-7705/07 ships Factory-equipped with a hard-wired, 20-Amp Plug on the AC Power Cord.
nnfr^p^AMnliDun^I P LUG ° R HARDWIRED AC POWER CORD TO EMPLOY EITHER A 15 AMP
OUTLET OR “AUDIOPHILE” TYPE DETACHABLE POWER CORD.
■ r^|^^7^^^^^^~^^^^~P R 000-0 T ' ^^ ARRA ~'^^ ^^^0^^^0—THE PRODUCTAN D PUCE THE USER AT EXTRFMF RISKflF
INJUR Y OR DEATH.
4

Adcom GFA-7705 Specifications

Power

power rating into 8 ohms	200 Watts continuous average power per channel
power rating into 4 ohms	300 Watts continuous average power per channel
power consumption idle 7 channel	120W

Audio Performance

frequency response at 1 watt into 8 ohms	+0, -0.22dB
power bandwidth	3 Hz to 130kHz
dynamic headroom into 4 ohms	1.90 dB

Electrical Specifications

input sensitivity for 1 watt output	0.1 volts
input sensitivity for 200 watts output	1.40 volts
damping factor (20Hz to 20kHz)	800

Dimensions and Weight

chassis dimensions	8.5” (216mm) x 17” (432mm) x 17.5” (444.5mm)
maximum dimensions	9 3/8” (238mm) x 17” (432mm) x 18.5” (470mm)
unit weight GFA-7707	35.5 kg