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  • Adcom GFA-555ms Stereo Power Amplifier
  • Adcom GFA-555ms Stereo Power Amplifier

Adcom GFA-555ms Stereo Power Amplifier

$2,160.00

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Adcom GFA-555ms 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.

Adcom GFA-555ms Stereo Power Amplifier

The Adcom GFA-555ms builds on one of audio's most respected amplifier legacies, reimagined for greater control, lower noise, and a more revealing presentation. Designed for those who demand both authority and finesse, it delivers high-current performance with the kind of composure that lets your system breathe effortlessly.

With 200 watts per channel into 8 ohms and 325 watts into 4 ohms, the GFA-555ms offers substantial headroom, driving even the most demanding speakers with ease. Its updated circuitry improves resolution and transparency, allowing finer details, deeper textures, and a more expansive soundstage to emerge.

What defines the GFA-555ms is its balance. Bass is powerful yet controlled, the midrange is open and dimensional, and the highs extend cleanly without harshness. Whether you're listening at low levels or pushing the system hard, it maintains a sense of grip and clarity that keeps everything in focus.

Built with a robust power supply and Adcom's signature no-nonsense engineering, the GFA-555ms is as reliable as it is capable — equally at home in a dedicated stereo system or a high-performance home theatre.

Key Features

  • 200W per channel (8 ohms) / 325W per channel (4 ohms) — massive headroom for any speaker
  • Bridgeable to 400W mono (8 ohms) — for high-power single-zone or subwoofer duty
  • High-current design for demanding, low-impedance speaker loads
  • Improved circuitry for greater transparency, resolution, and detail retrieval
  • Wide dynamic range with excellent grip and headroom at all listening levels
  • Dual voltage compatible — 120VAC & 230VAC / 50–60Hz for worldwide use
  • Legendary Adcom reliability with classic, no-nonsense build quality

Technical Specifications

Specification Value
Output Power – 8 Ohms (Stereo) 125W per channel
Output Power – 4 Ohms (Stereo) 200W per channel
Bridged Mono Power – 8 Ohms 400W
Frequency Response 10Hz – 20kHz, +0 / −0.25dB (1W into 8 ohms)
Power Bandwidth (−3dB) 10Hz – 100kHz
Input Impedance 100,000 ohms
Input Sensitivity 1.38V rms (125W into 8 ohms) / 123mV rms (1W into 8 ohms)
Damping Factor >400 (20Hz – 20kHz)
Power 120VAC & 230VAC / 50–60Hz
Maximum Dimensions (H × W × D) 6" × 17" × 12.5" (152 × 432 × 318 mm)
Weight 28.6 lbs. (13 kg)
Shipping Weight 33 lbs. (15 kg)

* For complete technical documentation, please refer to the official Adcom GFA-555ms user manual included with the unit or available upon request.

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