Adcom GFA-555SE Stereo Amplifier
- 200 watts per channel, 8 ohms
- 300 watts per channel, 4 ohms
- 600 Watts Bridged 8 ohms
- 2.5 dB Dynamic Headroom
- Tremendous Power Supply Capacity
Manufacturer's Description
The classic award winning amplifier design of the original GFA-555mkII has been reborn. Externally, the chassis footprint and front panel design are identical to the original.
Internally, all circuitry has been upgraded to meet ETL/ETLc, FCC, LVD and CE/EMC requirements using UL approved FR-4 printed circuit boards. High performance component selections include ultra low ESR electrolytic capacitors. The result of these improvements is lower distortion, better dynamic range, improved damping factor, greater stability and separation of individual instruments on the soundstage.
4/7/2009
4.0Review of power amplifier
By Nate-Dawg Bass Player
from Nashville, TN
About Me Musically Inclined, Professional, Tech Savvy
- Clean Sound
- Durable
- Easy To Set Up
- Good Power
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General Features
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Stereo Power Rating (watts)
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200
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Inputs / Outputs
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XLR
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(2) Rear Input
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Analog Audio
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(2) Rear Output, (2) Rear Input
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Speaker Terminals
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5-Way Binding Post
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Dimensions
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Weight (Pounds)
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36
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Depth (Inches)
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12.1
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Height (Inches)
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6.9
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Width (Inches)
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16.9
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Detailed Specifications:
Power Rating (To FTC Requirements)
200 Watts continuous average power into 8 ohms at any frequency between 20Hz and 20kHz with both channels driven at less than 0..04% THD.
300 Watts continuous average power into 4 ohms at any frequency between 20Hz and 20khz with both channels driven at less than 0.04% THD. *
600 Watts continuous average power into 8 ohms at any frequency between 20Hz and 20kHz at less than 0..09% THD, bridged.
IM Distortion (SMPTE)
1 watt to 200 watts into 8 ohms: = 0.009%
1 watt to 300 watts into 4 ohms: = 0.009%
IM Distortion (CCIF, Any Combination from 4kHz to 20kHz)
200 watts into 8 ohms: = 0.002%
300 watts into 4 ohms: = 0.003%
THD + Noise at 200 watts into 8 Ohms (Typical)
20Hz: 0.004%
1kHz: 0.003%
10kHz: 0.006%
20kHz: 0.010%
THD + Noise at 300 watts into 4 Ohms (Typical)
20Hz: 0.005%
1 kHz: 0.004%
10kHz: 0.015%
20kHz: 0.025%
IM Distortion, Bridged (SMPTE)
1 watt to 600 watts into 8 ohms: = 0.05%
1 watt to 850 watts into 4 ohms: = 0.05%
IM Distortion (CCIF, Any Combination from 4kHz to 20kHz)
600 watts into 8 ohms: = 0.005%
850 watts into 4 ohms: = 0.005%
THD + Noise at 600 watts into 8 Ohms, Bridged (Typical)
20Hz: 0.004%
1kHz: 0.004%
10kHz: 0.02%
20kHz: 0.04%
Frequency Response @ I Watt into 8 Ohms
10Hz to 20kHz: +0, -0.25dB
Power Bandwidth (-3dB): 10Hz to 100kHz
Dynamic Headroom Into 4 Ohms (1.7dB typical): 2.5dB
Signal to Noise Ratio, "A" Weighted
200 watts into 8 ohms: = 110dB
Gain: 27dB
Input impedance: 10k ohms balanced; 100k ohms unbalanced
* With supplemental cooling system. 14
Input Sensitivity
200 watts into 8 ohms: 1.75V rms
1 watt into 8 ohms: 130mV rms
Damping Factor
2OHz to 2OkHz: = 900
Rise Time
5kHz, 120V peak-to-peak square wave, 20% to 80%: 2.3µS
Power Consumption (Continuous, Both Channels Driven)
Quiescent: 72VA
Maximum: 1500VA
200 watts into 8 ohms: 675VA
325 watts into 4 ohms: 1180VA
600 watts into 8 ohms, bridged: 1320VA
General
Power (available in 230V by special order): 120VAC—50/60Hz
Chassis Dimension: 6-15/16" (176mm) x 12-1/8" (308mm) x 16-15/16" (430mm)
Maximum Dimensions: 7-1/2" (191mm) x 12-1/2" (318mm) x 17" (432mm)
Weight: 36 lbs. (16.3kg)
Weight, Packed: 40 lbs. (18.1kg)