Adcom GFA-7705 User Manual

It is suggested that the three front channels follow this chart for speaker lengths and wire gauges.
up to 24 feet...... AWG16
up to 36 feet.AWG14
up to 58 feet...AWG12
Generally, for the two rear surround channels, longer runs of cable are needed, but since less program
material is being transmitted through the cable, longer runs are acceptable:
up to 48 feet.... AWG16
up to 72 feet.....AWG14
up to 116 feet...AWG12
If longer runs are needed, it is best to consult with your Adcom Dealer to maximize the performance of
your system with your exact conditions.
All loudspeakers having a nominal impedance down to 4 ohms can be connected to and driven by the
GFA-7705/07. The amplifier can drive these low-impedance speakers 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 drop in impedance, in some parts of their frequency range, to as low as 2 ohms (and
sometimes less). You will not experience difficulties even with these very low impedance loads unless
you demand excessively high volume levels from your system.
It is not recommended that you run additional sets of speakers on any or all of the amplifiers in the
GFA-7705/07 in order to insure the integrity of the system. If you choose to add remote speakers in
another room, it is strongly suggested that a switching system to disconnect the non-home-theater
speakers be incorporated when the surround sound, home-theater mode is in operation. A device
such as the Adcom GFS-300 or GFS-600 Speaker Selector is strongly recommended. A Speaker Selector
enables you to maintain integrity while giving you the flexibility to add speakers throughout your
house.
CARING FOR YOUR GFA-7705/07
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 panel 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
fingerprinted, they can be cleaned with a soft lint-free cloth, slightly dampened with a very mild
detergent solution or glass cleaner.
DO NOT SPRAY OR POUR LIQUIDS OF ANY KIND ON THE GFA-7705/07.
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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