Accuphase A-48 Class A Stereo Power Amplifier

Accuphase A-48

Overview

Featuring a six-fold parallel push-pull architecture with power mosfets, as well as ideal gain allocation realised with discrete semiconductors in an instrumentation amplifier configuration. The A-48 harnesses a wealth of advanced technology. Its outstanding performance is exemplified by a signal/noise ratio of 117 dB, output of 360 watts into 1 ohm (music signals), and a damping factor of 800. The newly designed output protection circuit can detect any short-circuiting of the speaker terminals, for complete peace of mind. This power amplifier is the ultimate instrument for immersive music appreciation on the highest level.

A-48 Features

• Pure Class A stereo power amplifier with outstanding S/N ratio and very high damping factor
• Rated for 45 watts into 8 ohms and 360 watts into 1 ohm
• Power MOS-FETs in 6-parallel push-pull configuration
• Linear output characteristics over entire load impedance range
• Strong power supply with massive toroidal transformer and large 60,000 μF filtering capacitors
• High-gain signal input section in discrete configuration
• Instrumentation amplifier principle
• Dedicated power supply for signal input section
• All signal paths realised with discrete semiconductor components
• Balanced Remote Sensing
• MCS+ circuit topology
• Current feedback amplification principle
• Speaker output protection circuit guards against short-circuiting
• Line and balanced input connectors
• Highly responsive large peak power meters
• Two sets of large speaker terminals
• 4-step gain control
• Support for bi amplification and bridged mode
• Aluminium top plate with hairline finish

Specifications

• Power output: 45 watts per channel into 8Ω (stereo), 180W into 8Ω (mono)
• Frequency response: 20Hz to 20kHz
• Total harmonic distortion: 0.03%
• Damping factor: 800
• Gain: 28 dB
• Input sensitivity: 0.87V
• Signal to noise ratio: 117dB
• Speaker load impedance: 2Ω to 16Ω
• Dimensions: 465 x 211 x 464mm
• Weight: 33kg Net
  
• Year: 2019