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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. Being innovative is what keeps us going strong and achieving great things. Whether it's our iconic high current amplifiers or our cutting-edge digital processors, ADCOM components never fail to impress even the toughest crowds. As we keep pushing for better quality and performance.
Better Sound Delivery
We have worked long and hard to ensure that the GFA-555se power amplifier improves upon its 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.
Features
• Precision‑matched devices used throughout the signal path.
• 60,000 μF of power supply‑filter capacitance for greater reserve capacity.
• Independent power supplies for each channel.
• Fewer gain stages improve signal reproduction accuracy.
• Custom toroidal power transformer provides better regulation and greater peak current capability.
• Independent distortion LED for each channel.
• High quality, gold‑plated 5-way binding posts.
• High quality, gold‑plated RCA jacks.
• High quality, balanced XLR jacks.
• Large independent heatsinks for greater cooling capability of output devices.
• Heavy gauge, anodized aluminum front panel.
• Powder‑coated, baked chassis and top cover for greater durability.
• Cooling vents for greater efficiency and cooler operation while driving low impedance loads.
Adcom GFA-555se Power Amplifier
Power Rating (To FTC Requirements)
- 200 Watts continuous average power into 8 ohms at any frequency between 20Hz and 20kHz with both channels driven at less than 0.04% THD.
- 300 Watts continuous average power into 4 ohms at any frequency between 20Hz and 20khz with both channels driven at less than 0.04% THD. *
- 600 Watts continuous average power into 8 ohms at any frequency between 20Hz and 20kHz at less than 0.09% THD, bridged. *
* With supplemental cooling system.
IM Distortion (SMPTE)
1 watt to 200 watts into 8 ohms, ≤ 0.009%
1 watt to 300 watts into 4 ohms. ≤ 0.009%IM Distortion (CCIF, Any Combination from 4kHz to 20kHz)
200 watts into 8 ohms, ≤ 0.002%
300 watts into 4 ohms, ≤ 0.003%THD + Noise at 200 watts into 8 Ohms (Typical)
20Hz, 0.004%
1kHz, 0.003%
10kHz, 0.006%
20kHz, 0.010%THD + Noise at 300 watts into 4 Ohms (Typical)
20Hz, 0.005%
1 kHz, 0.004%
10kHz, 0.015%
20kHz, 0.025%IM Distortion, Bridged (SMPTE)
1 watt to 600 watts into 8 ohms, ≤ 0.05%
1 watt to 850 watts into 4 ohms, ≤ 0.05%IM Distortion (CCIF, Any Combination from 4kHz to 20kHz)
600 watts into 8 ohms, ≤ 0.005%
850 watts into 4 ohms, ≤ 0.005%THD + Noise at 600 watts into 8 Ohms, Bridged (Typical)
20Hz, 0.004%
1kHz, 0.004%
10kHz, 0.02%
20kHz, 0.04%Frequency Response @ 1 Watt into 8 Ohms
10Hz to 20kHz, +0, -0.25dB
Power Bandwidth (-3dB), 10Hz to 100kHz
Dynamic Headroom Into 4 Ohms (1.7dB typical), 2.5dB*
Signal to Noise Ratio, “A” Weighted
200 watts into 8 ohms, ≥ 110dBGain: 27dB
Input impedance: 10k ohms balanced; 100k ohms unbalanced
Input Sensitivity
200 watts into 8 ohms, 1.75V rms
1 watt into 8 ohms, 130mV rmsDamping Factor
20Hz to 20kHz, ≥ 900Rise Time
5kHz, 120V peak-to-peak square wave, 20% to 80%, 2.3μSPower Consumption (Continuous, Both Channels Driven)
Quiescent : 72VA
Maximum : 1500VA
200 watts into 8 ohms : 675VA
325 watts into 4 ohms : 1180VA
600 watts into 8 ohms, bridged : 1320VADimensions: 7"H x 12-1/8"D x 17"W
Net Weight: 36 Lbs
Specifications subject to change without notice.