Adcom GFA-7400 User Manual

All loudspeakers having a nominal impedance down to 4 ohms can be connected to and
driven by the GFA-7400/7300. The amplifier can drive these low-impedance speakers at more
than adequate power levels with no difficulty. It should be noted 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 volumes levels from your system.
It is not recommended that you run additional sets of speakers to the GFA-7400/7300. 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-3, GFS-4 or GFS-6 Speaker
Selector is strongly recommended. A Speaker Selector enables you to maintain good sonic
integrity while giving you the flexibility to add speakers throughout your house.
CARING FOR YOUR GFA-7400/7300
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-7400/7300.
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Adcom GFA-7400 Specifications

Power

continuous power per channel into 8 ohms	100 watts
continuous power per channel into 4 ohms	150 watts
power consumption quiescent	96 VA
maximum power consumption	1440 VA
power consumption at 100 watts into 8 ohms	1165 VA
power supply voltage	115 VAC - 50/60 Hz

Distortion

IM distortion SMPTE at 8 ohms	≤ 0.075%
IM distortion SMPTE at 4 ohms	≤ 0.075%
IM distortion CCIF at 8 ohms	≤ 0.025%
IM distortion CCIF at 4 ohms	≤ 0.025%
THD + noise at 100 watts into 8 ohms at 20Hz	0.0012%
THD + noise at 100 watts into 8 ohms at 1kHz	0.0012%
THD + noise at 100 watts into 8 ohms at 10kHz	0.02%
THD + noise at 100 watts into 8 ohms at 20kHz	0.025%
THD + noise at 150 watts into 4 ohms at 20Hz	0.025%
THD + noise at 150 watts into 4 ohms at 1kHz	0.025%
THD + noise at 150 watts into 4 ohms at 10kHz	0.035%
THD + noise at 150 watts into 4 ohms at 20kHz	0.045%

Performance

frequency response at 1 watt into 8 ohms	+0, -0.25 dB
power bandwidth	1.5 Hz to 65 kHz
dynamic headroom into 4 ohms	2.5 dB
signal to noise ratio	≥ 110 dB
gain	29 dB
input sensitivity for 1 watt	0.1 volts
input sensitivity for 100 watts	1.0 volts
input impedance	50 kΩ
damping factor	≥ 400
rise time	4.5 µS

Weight and Dimensions

chassis dimensions	5” (127mm) x 17” (432mm) x 14” (355.6mm)
maximum dimensions	5 3/4” (146mm) x 17” (432mm) x 15” (381mm)
weight	42 lb. (19.1 kg)
packed weight	48 lb. (22.8 kg)