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Bridgeable High Current Power Amplifier
2 Year Warranty
30 Day Returns
where to purchase
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. GFA-555se power amplifier represents the pinnacle of ADCOM’s audio engineering. This Nelson Pass design broke ground when it came out in the 80’s, getting rave reviews and providing tank-like reliability at a decent price. That these amplifiers are much in demand after so much time is strong testament to their value and durability. 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.


  • 200 watts per channel, 8 ohms      
  • 300 watts per channel, 4 ohms
  • 600 watts, 8 ohms BRIDGED  
  • Balanced and Single-Ended Inputs
  • 16 discrete output transistors
  • Custom 700 watt toroidal transformer
  • 60,000uF total storage capacitance
  • Ultra-Stable Bias Circuitry
  • Direct-Coupled Input & Output Circuitry
  • No Current Limiting
  • No Output Inductor
  • 120 VAC  50/60 Hz

Max Dimensions: 7 1/4" x 17" x 14 3/16"
Warranty: 2 yr. limited manufacturer


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"Great Amp. Great Power! Power is well above average, bass mid & treble almost exact."

Kenneth J. CA

"Theater-Quality Sound with plenty of headroom. Fantastic amp, robust and powerful."

Gregory B. MA

"I've bought two pairs of these speakers and now I can't live without them."

Shawn K. MI

"I can hear no difference in sound quality between AMP2400 and the amps which cost twice as much."

Ronald M. PA
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