Accuphase P-4600 Stereo Power Amplifier

Accuphase P-4600 Stereo Power Amplifier with 150 Watts into 8 Ohms

Filled with the highest-quality technologies, the P-4600 Class AB stereo power amplifier provides supreme driving performance. The power amp stage features 6-parallel push-pull power transistors, while its rated output of 150 W into 8 Ohms dwarfs conventional models. Combined with an S/N ratio of 125 dB and a damping factor of 800, it drives large speakers with ease and creates a rich, deep soundscape. The P-4600 power amplifier extracts the complete breadth of recordings, vividly recreating the rush of live performances, and lets you enjoy the very essence of musical performances.

Ample Output Power

The 6-parallel push-pull power transistor output stage produces linear output power of 150 W into 8 Ohms, 300 W into 4 Ohms, and a massive 450 W into 2 Ohms of maximum output power.

High Noise Suppression Performance

Ideal gain distribution and other sophisticated techniques improve noise level suppression by 18% over conventional models.

High Damping Factor

With a damping factor of 800, the speakers can be driven with full control over the counter-electromotive forces to get the most out of your speakers.

Ideal Gain Distribution

By achieving a high gain (12.6×) in the signal input section combined with the already superb noise performance creates a dramatic reduction in output noise.

Balanced Remote Sensing

Balanced remote sensing improves the damping factor by feeding back the GND at the same time as the signal output from the 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 impedance on the + and – sides, for excellent external noise suppression, and provides optimal circuitry for a high-end audio amplifier.

MCS+ Circuitry

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

Current Feedback Amplification Topology

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

Three-Stage Darlington Configuration

The three-stage Darlington configuration that drives the final output stage by a two-stage drive circuit minimizes any negative influence on the output stage from the counter-electromotive forces of the speakers.

Our Review

The Accuphase P-4600 is one of those power amps that makes listening feel just that little bit more special, thanks to a mix of effortless muscle and seriously refined engineering. Its 6-parallel push-pull output stage pumps out a confident 150 W into 8 Ohms (and far more as the load drops), giving it the sort of headroom that makes big speakers sit up straight, while the massive 800 damping factor and ultra-quiet 125 dB signal to noise ratio keep everything tight, clean and beautifully controlled. Technologies like its instrumentation-amplifier input stage, MCS+ noise-reduction circuitry and current-feedback topology all work quietly in the background to tease out the full texture of a recording, so what you hear feels rich, open and alive - almost like catching the energy of a live set from your own listening chair.