Adcom GFA-7400 User Manual

TABLE OF CONTENTS
SAFETY INFORMATION.1
INTRODUCTION
WARRANTY INFORMATION.2
DESCRIPTION OF UNIT
FEATURES GFA-7400.3
FEATURES GFA-7300.3
INSTALLATION & HOOKUP
UNPACKING THE GFA-7400/7300.4
PLACING THE GFA-7400/7300.4
QUICK CONNECTION.5
CONNECTION DIAGRAM.6
INPUTS AND OUTPUTS.7
CARING FOR YOUR GFA-7400/7300.8
OPERATION
INPUTS AND OUTPUTS.9
FUSES AND AC SUPPLY.10-11
LED DISPLAYS.12-13
TROUBLESHOOTING
RESOLVING PROBLEMS.14-15
SERVICE INFORMATION.16
SPECIFICATIONS.17-18
INTRODUCTION
Congratulations on your decision to purchase the GFA-7400 or GFA-7300 5-channel power
amplifier. The GFA-7400 and GFA-7300 have been designed to be high performance and
musically accurate in a configuration specifically designed to integrate with any home theater
processor. You have made a wise choice that will reward you for years to come with exceptionally
accurate and musical sound reproduction. To realize the full potential of your new amplifier, and
before making any connections to it, please read these operating and installation instructions
thoroughly.
ADCOM PROTECTION PLAN (USA ONLY)
ADCOM offers the enclosed valuable Limited Warranty. Please read the details on the
Warranty Card carefully to 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.
2

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)