ADCOM - GFA-585-SE - Power Amplifier
The ADCOM GFA-585se is a powerful Class A/B stereo power amplifier built for systems that need major output, high current capability, and stable control over demanding loudspeakers. Rated at 450 watts per channel into 8 ohms and 600 watts per channel into 4 ohms, it is designed for large rooms, full-range speakers, and high-output listening without giving up the direct, muscular character associated with ADCOM amplification.
The GFA-585se uses a large 1.7kVA shielded toroidal transformer, 132,800µF of output-stage filter capacitance, and 28 beta-matched TO-3 output transistors to support strong current delivery into real speaker loads. Balanced XLR and unbalanced RCA inputs give it flexibility with modern preamplifiers and traditional stereo systems, while 24K gold-plated speaker terminals provide a secure connection for heavy speaker cable. In bridged mono operation, the amplifier delivers 1000 watts into 8 ohms for systems requiring even greater output from a single channel.
ADCOM also builds the GFA-585se with practical system-control features, including manual power, auto signal sensing, 5V-12V trigger input, and 12V trigger output for connected components. DC voltage protection, speaker relay protection, thermal indicators, overload alerts, and large external heatsinks help support safe operation under demanding playback conditions. For listeners who want ADCOM’s strongest stereo amplifier platform, the GFA-585se offers serious power, broad compatibility, and the physical build expected from a flagship high-current design.
FEATURES:
- High-current Class A/B power amplifier for demanding speaker systems
- 450 watts per channel into 8 ohms
- 600 watts per channel into 4 ohms
- 1000 watts bridged mono into 8 ohms
- Balanced XLR and unbalanced RCA inputs
- Drives low-impedance and reactive loudspeaker loads
- 132,800µF filter capacitance supports strong reserve power
- 1.7kVA toroidal transformer provides stable current delivery
- High damping factor supports tight speaker control
- Auto signal sensing and 5V-12V trigger support system automation
SPECIFICATIONS:
| Product Type | High-Current Power Amplifier |
| Model | GFA-585se |
| Amplifier Class | Class A/B |
| Channels | 2-Channel Stereo / Bridged Mono |
| Power Output - 8 ohms | 450Wpc Continuous, 20Hz-20kHz, Both Channels Driven, <0.05% THD |
| Power Output - 4 ohms | 600Wpc Continuous, 20Hz-20kHz, Both Channels Driven, <0.07% THD |
| Power Output - Bridged Mono | 1000W into 8 ohms, 20Hz-20kHz, <0.10% THD |
| Frequency Response | 10Hz-140kHz, -3dB, 1W into 8 ohms |
| Power Bandwidth | 20Hz-20kHz, 0.25dB |
| Dynamic Headroom | 1.10dB into 4 ohms |
| Signal-to-Noise Ratio | ≥115dB, A-Weighted, 450W into 8 ohms |
| Gain | 27.0dB |
| Input Impedance | 22,000 ohms |
| Input Sensitivity | 2.681V RMS for 450W into 8 ohms; 126mV RMS for 1W into 8 ohms |
| Damping Factor | >800, 20Hz-20kHz |
| THD + Noise - 450W into 8 ohms | 0.020% at 20Hz; 0.008% at 1kHz; 0.030% at 10kHz; 0.050% at 20kHz |
| THD + Noise - 600W into 4 ohms | 0.04% at 20Hz; 0.01% at 1kHz; 0.05% at 10kHz; 0.07% at 20kHz |
| IM Distortion - 8 ohms | ≤0.03%, 1W to 450W |
| IM Distortion - 4 ohms | ≤0.05%, 1W to 600W |
| Power Supply Capacitance | 132,800µF Output Stage Filter Capacitance |
| Transformer | 1.7kVA Shielded Toroidal Power Transformer |
| Output Devices | 28 Beta-Matched TO-3 Output Transistors |
| Inputs | Balanced XLR, Unbalanced RCA |
| Speaker Terminals | 24K Gold-Plated Heavy Speaker Terminals |
| Power Modes | Manual, Auto Signal Sensing, 5V-12V DC Trigger |
| Trigger Output | 12V DC, 100mA, 3.5mm Jack |
| Protection | DC Voltage Protection, Speaker Relay Protection, Thermal and Overload Indicators |
| Power Consumption | 3.5VA Standby, 130VA Manual, 2000VA Maximum |
| Power Requirements | 120VAC and 230VAC, 50/60Hz |
| Maximum Dimensions (H x W x D) | 10.7" x 19.0" x 19.7" (275mm x 482mm x 502mm) |
| Weight | 70.4 lbs (32kg) |
| Shipping Weight | 79.2 lbs (36kg) |
