Accuphase A-300 Mono Power Amplifier

Accuphase A-300 Mono Power Amplifier

Yokohama, Japan | 2022 – Accuphase’s 50th Anniversary model embodies power amplifier perfection.

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Created to mark our 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.

The A-300 employs sophisticated circuitry and hand-selected materials to create a power amplifier with well-honed expressiveness and cutting-edge technologies.

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 Winto 4 ohms, 500 Winto 2 ohms, and a tremendous 1,000 W into 1 ohm of maximum output power.

Ultra low noise performance

Accuphase A-300 Mono Power Amplifier

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

Accuphase A-300 Mono Power Amplifier

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

Accuphase A-300 Mono Power Amplifier

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

Instrumentation amplifier

Accuphase A-300 Mono Power 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.

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Double MCS+ circuit

Accuphase A-300 Mono Power Amplifier

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.

Accuphase A-300 Mono Power Amplifier

Current feedback amplification topology

Accuphase A-300 Mono Power Amplifier

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.

Accuphase A-300 Mono Power Amplifier

Accuphase A-300 Mono Power Amplifier

Accuphase A-300 Mono Power Amplifier

Accuphase A-300 Mono Power Amplifier

Accuphase A-300 Mono Power Amplifier

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