Adcom GFA-7400 Service Manual

5
GFA-7400 SPECIFICATIONS
Power Rating (To FTC Requirements)
100 watts continuous average power per channel into 8 ohms at any frequency between 20Hz to 20kHz with
all channels driven at less than 0.075% THD
150 watts continuous average power per channel into 4 ohms at any frequency between 20Hz to 20kHz with
all channels driven at less than 0.075% THD
IM Distortion (SMPTE)
1 watt to 100 watts into 8 ohms ........................................................................................................................... ≤ 0.075%
1 watt to 150 watts into 4 ohms ........................................................................................................................... ≤ 0.075%
IM Distortion (CCIF, Any Combination from 4kHz to 20kHz)
100 watts into 8 ohms.......................................................................................................................................... ≤ 0.025%
150 watts into 4 ohms.......................................................................................................................................... ≤ 0.025%
THD + Noise at 100 watts into 8 ohms (Typical)
20Hz..................................................................................................................................................................... 0.0012%
1kHz ..................................................................................................................................................................... 0.0012%
10kHz ....................................................................................................................................................................... 0.02%
20kHz ..................................................................................................................................................................... 0.025%
THD + Noise at 150 watts into 4 ohms (Typical)
20Hz....................................................................................................................................................................... 0.025%
1kHz ....................................................................................................................................................................... 0.025%
10kHz .................................................................................................................................................................... . 0.035%
20kHz ..................................................................................................................................................................... 0.045%
Frequency Response @ 1 Watt into 8 ohms (10Hz to 20kHz) ................................................................................. +0, -0.25dB
Power Bandwidth (-3dB) ...................................................................................................................................... 1.5Hz to 65kHz
Dynamic Headroom into 4 ohms ....................................................................................................................................... 2.5 dB
Signal to Noise Ratio, “A” Weighted (100 watts into 8 ohms) .................................................................................... . ≥ 110dB
Gain........................................................................................................................................................................................ 29dB
Input Sensitivity
for 1 Watt............................................................................................................................................................... 0.1 volts
for 100 Watts......................................................................................................................................................... 1.0 volts
Input Impedance ................................................................................................................................................................... 50kΩ
Damping Factor (20Hz to 20kHz) ........................................................................................................................................ ≥ 400
Rise Time (5kHz, 90V, peak-to-peak square wave, 20% to 80%)...................................................................................... 4.5µS
Power Consumption (Continuous, All Channels Driven)
Quiescent .................................................................................................................................................................. 96VA
Maximum............................................................................................................................................................... 1440VA
100 watts into 8 ohms............................................................................................................................................ 1165VA
Power (Available in 230VAC on special order)................................................................................................. 115VAC - 50/60Hz
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)
Weight, Packed ..................................................................................................................................................... 48 lb. (22.8 kg)

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)