ADCOM GFA-555se Power Amplifier

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ADCOM GFA-555se Power Amplifier


The classic award winning amplifier design of the original GFA-555mkII has been reborn. The Adcom GFA-555 represents the most advanced thinking in audio amplifier design. It offers exceptional value and superior performance at a reasonable price.

We have worked long and hard to ensure that the GFA-555se improves upon it’s original eminent version in key areas, delivering even better performance. 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 and greater stability and separation of individual instruments on the sound stage.

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Output Power

200 watts per channel, 8 ohms
300 watts per channel, 4 ohms
600 watts, 8 ohms BRIDGED

Frequency Resp.

@ 1watt, 8-ohms:
10Hz to 20kHz +0, -0.25dB

Power Bandwidth (-3dB):

1.7Hz to 100kHz


Input Impedance

100k ohms unbalanced
10k ohms balanced


120VAC & 230VAC / 50-60Hz

Max Dimensions

7-1/2” x 12-1/2” x 17”
191mm X 318mm X 432mm



36lbs (16.3kg)
Shipping weight:39lbs (18kg)

Input Sensitivity

1.75V rms, 200W into 8 ohms.
130mV rms, 1 W into 8 ohms.

Damping Factor

≥ 900, 20Hz to 20kHz.

Additional information

Weight39 lbs