Accuphase A-300 Class A Mono Power Amplifier

Accuphase A-300 Class A Mono Power Amplifier with 125 Watts into 8 Ohms

Created to mark Accuphase’s 50th anniversary, the A-300 redefines the ideal for Class A power amplifiers. 20-parallel push-pull power MOS-FETs in the output stage improves performance by 25% over conventional models with outputs of 125 W into 8 Ohms, 250 W into 4 Ohms, 500 W into 2 Ohms, and 1,000 W into 1 Ohm that set the stage for enviable constant-voltage drive. The fully discrete balanced input amplifier achieves a level of quietness that will make you forget you are using audio equipment for reproduction. The A-300’s unmatched expressiveness lets you enjoy the most exquisite pieces from the world’s greatest composers.

Ample Output Power

The Class A driven 20-parallel push-pull power MOS-FETs in the output stage produce linear output power of 125 W into 8 Ohms, 250 W into 4 Ohms, 500 W into 2 Ohms, and a tremendous 1,000 W into 1 Ohm of maximum output power.

Ultra-Low Noise Performance

Ideal gain distribution and other sophisticated techniques improve noise level suppression by 20% 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

Noise level suppression has been dramatically improved by assigning a high gain (12.6×) in the signal input section with excellent noise figure results.

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, and providing optimal circuitry for this high-end audio amplifier.

Double 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%. The A-300 comes with 2 MCS+ circuits in a Double MCS+ circuit configuration.

Current Feedback Amplification Topology

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

Our Review

Marking Accuphase’s 50th anniversary in serious style, the A-300 Class A mono power amplifier feels like settling into a beautifully over-engineered listening experience where everything just flows. Its 20-parallel push-pull MOS-FET output stage delivers a frankly outrageous sweep of linear power - up to 1,000 watts into 1 ohm - yet it does so with the kind of composure that makes the music feel effortless. The fully discrete balanced input stage and clever gain distribution work together to drop the noise floor to a point where you almost forget there’s any hardware in the chain at all, while the Double MCS+ and current-feedback topology keep everything sounding vivid, stable and wonderfully natural. With a damping factor of 1,000 and balanced remote sensing, it grips your speakers like few amps can, letting their true character shine. All up, the A-300 brings a mix of technical mastery and musical finesse that turns every listening session into a bit of a moment.