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ADCOM - GFA-555MS - Power Amplifier
SKU
ACM-GFA-555MS
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ADCOM - GFA-555-MS -Power Amplifier
The ADCOM GFA-555ms is a high-current power amplifier designed for two-channel systems that need strong output, speaker control, and long-term stability. Built to drive a broad range of loudspeakers, including low-impedance and highly reactive designs, the GFA-555ms delivers sustained power with the authority needed for demanding stereo playback.
The amplifier is rated at 125 watts per channel into 8 ohms, 200 watts per channel into 4 ohms, and 400 watts in bridged mono operation into 8 ohms. Its wide 10Hz-100kHz power bandwidth, high damping factor, and 100,000 ohms input impedance make it a strong match for quality preamplifiers and full-range speaker systems. ADCOM’s design includes a large power supply, substantial heatsinking, and circuitry intended to maintain low distortion under real speaker loads.
For system protection and monitoring, the GFA-555ms includes thermal protection and instantaneous distortion alert LEDs, helping users recognize overload conditions before they become damaging. Its heavy-duty chassis, passive cooling layout, and high-current output stage make it well suited for traditional HiFi systems, power-hungry loudspeakers, and users who want a dedicated amplifier with classic ADCOM muscle.
FEATURES:
- High-current two-channel power amplifier for demanding speaker systems
- 125 watts per channel into 8 ohms
- 200 watts per channel into 4 ohms
- 400 watts bridged mono into 8 ohms
- Drives low-impedance and reactive speaker loads with stability
- High damping factor supports tight speaker control
- 100,000 ohms input impedance supports preamp compatibility
- Thermal protection and distortion alert LEDs support safe operation
- Heavy-duty chassis with large heatsinks for passive cooling
SPECIFICATIONS:
| Product Type | High Current Power Amplifier |
| Model | GFA-555ms |
| Channels | 2-Channel Stereo / Bridged Mono |
| Power Output - 8 ohms | 125Wpc Continuous, 20Hz-20kHz, Both Channels Driven, <0.04% THD |
| Power Output - 4 ohms | 200Wpc Continuous, 20Hz-20kHz, Both Channels Driven, <0.05% THD |
| Power Output - Bridged Mono | 400W into 8 ohms, 20Hz-20kHz, <0.09% THD |
| Frequency Response | 10Hz-20kHz, +0 / -0.25dB at 1W into 8 ohms |
| Power Bandwidth | 10Hz-100kHz, -3dB |
| Dynamic Headroom | 1.3dB into 4 ohms |
| Signal-to-Noise Ratio | 102dB, A-Weighted, 125W into 8 ohms |
| Gain | 27.2dB |
| Input Impedance | 100,000 ohms |
| Input Sensitivity | 1.38V RMS for 125W into 8 ohms; 123mV RMS for 1W into 8 ohms |
| Damping Factor | >400, 20Hz-20kHz |
| THD + Noise - 125W into 8 ohms | 0.004% at 20Hz; 0.003% at 1kHz; 0.006% at 10kHz; 0.020% at 20kHz |
| THD + Noise - 200W into 4 ohms | 0.005% at 20Hz; 0.004% at 1kHz; 0.020% at 10kHz; 0.030% at 20kHz |
| IM Distortion - 8 ohms | ≤0.009%, 1W to 125W |
| IM Distortion - 4 ohms | ≤0.009%, 1W to 200W |
| Power Consumption | 48VA Quiescent; 900VA Maximum |
| Power Requirements | 120VAC / 60Hz |
| Chassis Dimensions (H x W x D) | 5.2" x 16.9" x 12.1" (134mm x 430mm x 308mm) |
| Maximum Dimensions (H x W x D) | 6.0" x 17.0" x 12.5" (152mm x 432mm x 318mm) |
| Weight | 28.6 lbs (13kg) |
| Shipping Weight | 33 lbs (15kg) |
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