Adcom GFA-5300 Service Manual

6
GFA-5300 SPECIFICATIONS
Power Rating (To FTC Requirements)
80 watts continuous average power per channel into 8 ohms at any frequency between 20Hz to 20kHz with
all channels driven at less than 0.18% THD
125 watts continuous average power per channel into 4 ohms at any frequency between 20Hz to 20kHz with
all channels driven at less than 0.18% THD
IM Distortion (SMPTE)
1 watt to 80 watts into 8 ohms..................................................................................................................................... ≤ 0.07%
1 watt to 125 watts into 4 ohms................................................................................................................................... ≤ 0.07%
IM Distortion (CCIF, Any Combination from 4kHz to 20kHz)
80 watts into 8 ohms.................................................................................................................................................. ≤ 0.035%
125 watts into 4 ohms................................................................................................................................................ ≤ 0.035%
THD + Noise at 80 watts into 8 ohms (Typical)
20Hz............................................................................................................................................................................... 0.018%
1kHz ................................................................................................................................................................................. 0.02%
10kHz............................................................................................................................................................................... 0.07%
20kHz............................................................................................................................................................................... 0.14%
THD + Noise at 125 watts into 4 ohms (Typical)
20Hz............................................................................................................................................................................... 0.018%
1kHz ................................................................................................................................................................................. 0.02%
10kHz............................................................................................................................................................................... 0.08%
20kHz............................................................................................................................................................................. 0.165%
Frequency Response @ 1 Watt into 8 ohms (10Hz to 20kHz).................................................................................. +0, -0.25dB
Power Bandwidth (-3dB)............................................................................................................................................ 3Hz to 130kHz
Dynamic Headroom into 4 ohms............................................................................................................................................ 2.1 dB
Signal to Noise Ratio, “A” Weighted (80 watts into 8 ohms).......................................................................................... ≥ 100dB
Gain...... .......................................................................................................................................................................................... 29dB
Input Sensitivity
for 1 Watt...................................................................................................................................................................... 0.1 volts
for 80 Watts.................................................................................................................................................................. 0.9 volts
Input Impedance....................................................................................................................................................................... 49.9kΩ
Damping Factor (20Hz to 20kHz)............................................................................................................................................. ≥ 350
Rise Time (5kHz, 90V, peak-to-peak square wave, 20% to 80%)....................................................................................... 1.8µS
Power Consumption (Continuous, All Channels Driven)
Quiescent........................................................................................................................................................................ 100VA
Maximum......................................................................................................................................................................... 720VA
80 watts into 8 ohms...................................................................................................................................................... 510VA
125 watts into 4 ohms.................................................................................................................................................... 720VA
Power (Available in 230VAC on special order).................................................................................................... 115VAC - 50/60Hz
Chassis Dimensions....................................................................................... 4 1/2” (105mm) x 17” (432mm) x 11 3/8” (289mm)
Maximum Dimensions.................................................................................... 4 3/8” (111mm) x 17” (432mm) x 12 1/8” (308mm)
Weight.. .......................................................................................................................................................................... 22 lb. (10.0 kg)
Weight, Packed............................................................................................................................................................. 25 lb. (11.3 kg)

Adcom GFA-5300 Specifications

Power

power rating into 8 ohms	80 watts continuous average power per channel
power rating into 4 ohms	125 watts continuous average power per channel
power consumption - quiescent	100 VA
power consumption - maximum	720 VA
power consumption - 80 watts into 8 ohms	510 VA
power consumption - 125 watts into 4 ohms	720 VA
power supply voltage	115 VAC - 50/60 Hz

Distortion and Noise

IM distortion SMPTE 8 ohms	≤ 0.07%
IM distortion SMPTE 4 ohms	≤ 0.07%
IM distortion CCIF 8 ohms	≤ 0.035%
IM distortion CCIF 4 ohms	≤ 0.035%
THD + Noise at 80 watts into 8 ohms 20Hz	0.018%
THD + Noise at 80 watts into 8 ohms 1kHz	0.02%
THD + Noise at 80 watts into 8 ohms 10kHz	0.07%
THD + Noise at 80 watts into 8 ohms 20kHz	0.14%
THD + Noise at 125 watts into 4 ohms 20Hz	0.018%
THD + Noise at 125 watts into 4 ohms 1kHz	0.02%
THD + Noise at 125 watts into 4 ohms 10kHz	0.08%
THD + Noise at 125 watts into 4 ohms 20kHz	0.165%
signal to noise ratio (A weighted)	≥ 100 dB

Frequency and Gain

frequency response	+0, -0.25 dB from 10Hz to 20kHz
power bandwidth	3Hz to 130kHz
dynamic headroom into 4 ohms	2.1 dB
gain	29 dB

Input and Output

input sensitivity for 1 watt	0.1 volts
input sensitivity for 80 watts	0.9 volts
input impedance	49.9 kΩ
damping factor	≥ 350
rise time	1.8 µS

Weight and Dimensions

chassis dimensions	4 1/2” x 17” x 11 3/8” (105mm x 432mm x 289mm)
maximum dimensions	4 3/8” x 17” x 12 1/8” (111mm x 432mm x 308mm)
weight	22 lb. (10.0 kg)
weight, packed	25 lb. (11.3 kg)