Power Amplifiers

ADCOM GFA-555se Stereo Power Amplifier



The original ADCOM GFA-555 stereo power amplifier hit the market in 1985. Standby for math calculation. That's 25 years ago. Enough time for a digital music revolution (maybe peaking now). Enough time for the Rolling Stones to release 11 new records (28 for Neil Young). Enough time for most rock bands to burn out, fade away and then stage a comeback. And, enough time for a hifi manufacturer to come and go as well. Adcom is still going strong though. 25 years after the original version of the GFA-555, they are celebrating one of the best selling bits of hifi kit ever with a special edition. Here, we review the latest iteration fo this classic, called the GFA-555se.


  • Design: Two-Channel Power Amplifier
  • Output: 200 Watts RMS x 2 into 8 Ohms
  • Inputs: RCA and XLR; Bridged Operation Supported
  • 60,000 uF capacitance
  • MFR: 10 Hz - 20 kHz +0, -0.25 dB
  • Input Impedance: 27dB
  • Output Impedance: Not specified
  • Input Sensitivity: 1.75V RMS for Full Output into 8 Ohms
  • THD+N: 0.003% @ 1 kHz (200W into 8 Ohms)
  • IMD: <0.002% (200W into 8 Ohms)
  • Damping Factor: >900 (20 Hz - 20 kHz)
  • MSRP: $1,400 USA
  • Adcom