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