Great care has been taken by ADCOM to assure that your 5-channel power amplifier is as flawless in appearance as it is electronically. The front panel is a heavy- gauge, high-grade aluminum extrusion carefully finished and anodized for durability. The chassis, top cover and rear panel are of heavy-gauge steel, both painted and baked. If the front panel, top or sides should become dusty or fingerprinted, they can be cleaned with a Swifter and/or a clean, soft, Lintless, microfiber cloth,slightly dampened with a very mild detergent solution or nonammonia glass cleaner.

Home theater authority — all five channels, no compromise.

The Adcom GFA-5705 is a high-performance 5-channel power amplifier engineered specifically for home theater systems that demand real power across every channel. Delivering 200 watts per channel into 8 ohms — with all five channels driven simultaneously — the GFA-5705 brings the same high-current authority and low-distortion performance Adcom is known for to the full surround experience.

The GFA-5705 is built to drive a very broad range of loudspeakers, including those with very low impedances, at sustained high-power levels — even when impedances are highly reactive. Great care was taken to ensure distortion remains extremely low under these demanding conditions, making it one of the most capable 5-channel amplifiers available at its price point.

Massive Power Supply

At the core of the GFA-5705 is a substantial power supply built around a high-efficiency toroidal transformer — chosen for superior regulation and minimal radiated noise. It feeds an enormous storage bank of 30,000µF of filter capacitance per channel, totaling 150,000µF across all five channels. This reserve ensures stable, unwavering voltage under any power demand — from quiet dialogue to full-range, multi-channel peaks — keeping every channel composed and in control.

Built to Last

The GFA-5705 is as flawless in appearance as it is electronically. Its front panel is crafted from heavy-gauge anodized aluminum extrusion, while the chassis, top cover, and rear panel are heavy-gauge painted and baked steel. The result is a substantial, rack-ready amplifier that looks and feels like the serious piece of engineering it is.

Key Features

• 200W × 5 channels (8 ohms) / 300W × 5 channels (4 ohms) — all channels driven simultaneously
• 150,000µF total filter capacitance (30,000µF per channel) — massive power reserve for sustained, high-current delivery
• High-efficiency toroidal transformer — exceptional regulation, minimal noise and leakage inductance
• Drives low-impedance and reactive speaker loads with stability and control
• Damping factor >300 (20Hz–20kHz) — tight, authoritative bass across all channels
• Ultra-wide power bandwidth — 5Hz to 100kHz (−3dB)
• Ideal for home theater — purpose-built 5-channel design for surround sound systems
• Dual voltage compatible — 120VAC & 230VAC / 50–60Hz
• Heavy-gauge anodized aluminum & baked steel chassis — rack-compatible, built for long-term reliability

Technical Specifications