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Power Amplifier

For those who desire the power finesse in a two-channel amplifier, look no further than GFA-555ms. The GFA-555ms amplifier can drive a very broad range of loudspeakers, including those with very low impedances, at sustained high-power levels, even when the impedances are highly reactive.



Dynamic Sound

GFA-555ms runs on 200 W into 4 ohms, takes both Unbalanced and Balanced inputs and drives your speakers with 40+40 Watts of high performance, ultra low distortion power output all from a neat package. We have engineered an uncompromised circuit design that delivers ultra-low distortion and a crisp dynamic sound. It all adds up to a startlingly vivid and highly impactful musical performance that will put more energy into your loudspeakers as well as control them like never before.

Low Distortion

Great care was taken to insure that distortion in the amplifier would remain extremely low, particularly when driving these highly reactive loads in which the phase angles of the voltageand the current are substantially different.



spec gfa555ms
Output Power
125 watts into 8 ohms
200 watts into 4 ohms
400 watts into 8 ohms, bridged
Frequency Resp.
@ 1watt, 8-ohms:
+0. -0.25dB, 10Hz to 20kHz
Power Bandwidth (-3dB):
10Hz to 100kHz
Input Impedance
100,000 ohms.
120VAC & 230VAC / 50-60Hz
Damping Factor
>400, 20Hz to 20kHz
Input Sensitivity
1.38V rms, 125W into 8 ohms
123mV rms, 1W into 8 ohms.
Max Dimensions
6” x 17” x 12.5”
152mm x 432mm x 318mm
Shipping Weight: 33lbs.(15kg)
Note: For more technical specs, please refer to the attached user manual & Spec