ADCOM GFA-5705 Amplifier
Best multi-channel amplifier for demanding home theater speaker setups.
Experience powerful and immersive audio with the ADCOM GFA-5705 Five Channel Home Theater Amplifier. Engineered to drive a wide range of loudspeakers, even at low impedances, this amplifier delivers sustained high-power output with exceptionally low distortion. Its robust power supply features a large toroidal transformer and substantial filter capacitance for stable voltage delivery under demanding conditions. Enjoy seamless integration with balanced XLR and unbalanced RCA inputs, and convenient features like auto on/off with a 12V trigger. The GFA-5705 is built for performance and reliability, ensuring an exceptional listening experience.
$3799.00
Owner Satisfaction
4.7
/ 5
Category Rank
325
/ 1719
#325 in Power Amplifiers
Price vs Category Average
-54%
Below average
Output Power
20085
/ watts per channel into ohms (all channels driven)
Who it's for
- Audiophiles driving power-hungry, low-impedance speaker systems
- Home theater enthusiasts prioritizing high-fidelity, multi-channel sound
- Listeners seeking long-term reliability and heavy-duty construction
Who should skip it
- Users with limited ventilation or small, enclosed spaces
- Owners of standard AV racks with limited weight capacity
- Buyers wanting modern convenience features and zero maintenance
Performance breakdown
Power Delivery
Massive current reserves effortlessly drive even the most demanding loudspeaker loads.
Signal Clarity
Ultra-low distortion levels ensure your audio remains pristine and transparent.
Build Integrity
Heavy-duty construction provides a stable, vibration-resistant foundation for high-fidelity sound.
Connectivity Versatility
Balanced XLR and RCA inputs offer flexible integration with professional-grade components.
Operational Convenience
The 12V trigger simplifies system startup but lacks modern remote control features.
Thermal Stability
Robust toroidal transformer design maintains consistent voltage under heavy sustained output.
Key Specs
Output Power
200 watts per channel into 8 ohms (all 5 channels driven)
Output Power
300 watts per channel into 4 ohms (all 5 channels driven)
THD+Noise @ 200 Watts into 8 ohms
0.008%
THD+Noise @ 300 Watts into 4 ohms
0.01%
Frequency Response
10Hz to 20kHz, +0 - 0.25dB
Signal-to-Noise Ratio
>106dB (A-Weighted, 200 Watts into 8 Ohms)
Input Impedance
22k ohms
Power Supply
120V AC 50/60 Hz, Max power consumption 2000VA
Features
- Drives demanding loudspeakers with low impedance
- Sustained high-power output
- Extremely low distortion for clarity
- Robust power supply for stable voltage
- Auto ON/OFF with 12V Trigger
- High-quality speaker terminals
- Durable aluminum and steel construction
- Balanced XLR & unbalanced RCA inputs
What customers say
The ADCOM GFA-5705 is celebrated as a powerhouse amplifier offering immense, effortless power reserves ideal for demanding speakers and home theater systems. Owners consistently praise its clean, neutral, and highly detailed sound signature, prioritizing accuracy. A key theme is its legendary build quality and impressive longevity, suggesting exceptional reliability over time. While it delivers high fidelity, users note it runs hot, requiring good ventilation. For many, its value proposition is outstanding, providing performance that rivals much pricier modern equipment. This amplifier maintains a strong following for its high current delivery.
Know before you buy
Yes, the GFA-5705 is specifically engineered to drive demanding loudspeakers. It is rated to deliver 300 watts per channel into 4-ohm loads, ensuring stable performance even with difficult speaker configurations.
No, the GFA-5705 is a dedicated power amplifier and does not include a digital-to-analog converter, streaming features, or wireless connectivity. It is designed solely to amplify analog signals from your pre-amplifier or processor.
You can connect your processor or pre-amplifier using either balanced XLR or unbalanced RCA inputs. Additionally, the unit includes a 12V trigger input, allowing your system to automatically power the amplifier on or off alongside your other components.
No, the GFA-5705 is not bridgeable. It is designed as a high-performance five-channel amplifier, and its internal architecture does not support combining channels for increased power output.
The GFA-5705 is a substantial piece of equipment weighing 96 lbs and measuring 8 3/4" x 17" x 17 3/4". Due to its weight and heat dissipation needs, ensure you place it on a sturdy, well-ventilated surface, as it is not designed for rack mounting.
Absolutely. The amplifier is optimized for 8-ohm loads, delivering a robust 200 watts per channel across all five channels simultaneously with exceptionally low distortion.
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