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ACCUPHASE A-48s

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CLASS-A 50W/ch STEREO POWER AMPLIFIER

The A-48S incorporates state-of-the-art technologies to create a Class A power amplifier that delivers superb performance. Benefitting from years of ideal designs of high-performance units, the A-48S utilizes 6-parallel pull-push power MOS-FETs and boasts an output of 50 W into 8 ohms, 100 W into 4 ohms, 200 W into 2 ohms, and 400 W into 1 ohm at the same size as conventional models. The noise level has also been further reduced by 6%, while providing a damping factor of 1,000. The A-48S will bring the best out of any speaker, enabling you to enjoy unparalleled sound quality and expansiveness.

GROUND BREAKING TECHNOLOGY

The A-48S employs sophisticated circuitry and carefully selected materials to create a power amplifier with perfectly honed expressiveness.

Ample output power

The Class A driven 6-parallel push-pull power MOS-FETs in the output stage produce a linear output power of 50 W into 8 ohms, 100 W into 4 ohms, 200 W into 2 ohms, and 400 W into 1 ohm.

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.

MCS+ circuit

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%.

Excellent noise suppression performance

Ideal gain distribution and other sophisticated techniques improve noise level suppression
by 6% 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.

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.

Ideal gain distribution

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

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.

ADVANCED FEATURES

• Class A driven 6-parallel push-pull MOS-FET output stage


• Large linear output of 50 W / 8 ohms, 100 W / 4 ohms, 200 W / 2 ohms, 400 W / 1 ohm


• Instrumentation amplifier


• Current feedback amplification topology


• Balanced remote sensing


• MCS+ circuitry


• Large, high-efficiency toroidal transformer


• High capacity 68,000 μF filtering capacitors


• Large speaker terminals connected directly to protection circuitry


• Protection circuitry using MOS-FET switches


• High damping factor of 1,000


• Large, high-sensitivity power meters ranging from –50 dB


• Bi-amping connection and bridged connection switching


• Speaker output protection circuit guards against short-circuiting


• Aluminum hairline finish top plate


• High-carbon cast iron insulator feet with superior damping characteristics