Accuphase A-80 Class A Stereo Power Amplifier

Accuphase A-80 Class A Stereo Power Amplifier with 65 Watts into 8 Ohms

The A-80 is a Class A power amplifier developed as a stereo amplifier version of Accuphase’s 50th anniversary A-300 model. Optimizing the 10-parallel push-pull power MOS-FETs in the output stage produces an output power of 65 W into 8 Ohms, 130 W into 4 Ohms, 260 W into 2 Ohms, and 520 W into 1 Ohm. Rigorous investment into new, cutting-edge noise reduction technologies has achieved a sense of presence and minute expression that rival live performances. The A-80 power amplifier perfectly fuses modern technology with the wealth of knowledge Accuphase has amassed in its pursuit of perfect sonic expression.

Ample Output Power

The Class A driven 10-parallel push-pull power MOS-FETs in the output stage produce linear output power of 65 W into 8 Ohms, 130 W into 4 Ohms, 260 W into 2 Ohms, and 520 W into 1 Ohm.

High Noise Performance

Ideal gain distribution and other sophisticated techniques improve noise level suppression by 7% over conventional models.

High Damping Factor

With a damping factor of 1,000, the speakers can be driven with full control over the counter-electromotive forces to get the most out of your speakers.

Ideal Gain Distribution

Allocating a high gain (12.6×) in the signal input section with its superb noise suppression rating drastically reduces output noise.

Balanced Remote Sensing

Balanced remote sensing improves damping factor by feeding back the GND at the same time as the signal output from speaker terminals.

Instrumentation Amplifier

With balanced circuits in the signal input section, the amplification stage is comprised entirely of an instrumentation amplifier principle that equalizes input impedance on the + and – sides for excellent external noise suppression, while providing optimal circuitry for a high-end audio amplifier.

MCS+ Circuit

By placing the voltage amplification stage in a two-parallel circuit layout, the MCS+ (Multiple Circuit Summing-up) circuit theoretically reduces the noise floor by about 30%.

Current Feedback Amplification Topology

The current feedback amplification circuit offers exceptional performance in the high range with almost no impact on the frequency characteristics even when gain is switched, resulting in natural and dynamic driving of the speakers.

Our Review

The Accuphase A-80 takes the spirit of the anniversary A-300 and brings it into a beautifully balanced stereo package, delivering that unmistakable Class A warmth with plenty of muscle behind it. Its 10-parallel push-pull MOS-FET output stage feels effortlessly confident, serving up a remarkably linear 65 watts into 8 Ohms and scaling all the way to a staggering 520 watts into 1 Ohm, so your speakers always feel fully in command. What really stands out, though, is the sense of calm clarity the A-80 brings to the room - thanks to clever noise-reduction tech like ideal gain distribution, MCS+ circuitry, and a fully balanced instrumentation amplifier topology, it reveals tiny musical details with an almost live presence. Add in a massive damping factor of 1,000, balanced remote sensing, and those wonderfully responsive bar-graph meters, and the whole experience feels like Accuphase at its best - cool, composed, and utterly devoted to perfect sonic expression.