Accuphase A-48S Class-A Stereo Power Amplifier

Details

Specifications

Stereo Power Amplifier (Class-A, 2x50w)

The Accuphase A-48 is a powerhouse amplifier designed to deliver exceptional performance in high-end audio systems. With its robust construction and advanced circuitry, the A-48 offers a level of control and authority that is second to none.

At the heart of the A-48 lies a fully balanced Class-A amplifier circuit, ensuring exceptional linearity and low distortion. The amplifier's power supply is meticulously designed to provide clean, stable energy, even during demanding listening sessions. The result is a sound that is both powerful and refined, capable of driving even the most demanding speakers with ease.

Featuring a six-fold parallel push-pull architecture, the A-48S harnesses a wealth of advanced technology. Its outstanding performance is exemplified by a signal/noise ratio of 118 dB, output of 400 watts into 1 ohm (music signals), and a damping factor of 1000. 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.

Accuphase make some of the finest equipment in the world and we can't recommend them highly enough. All of their components will deliver a marked improvement to any system and are a fantastic base to a new build or an unparalleled upgrade to an existing one. Accuphase amplifiers will deliver all the power you need with very low noise levels.

Features

- Pure Class A operation delivers quality power: 50 watts x 2 into 8 ohms

- Power MOSFET output stage features 6-parallel push-pull configuration

- Further improved MCS+ circuit topology

- Current feedback principle combines stable operation with outstanding sound quality

- Bridged mode allows upgrading to true monophonic amplifier

- Large high-efficiency toroidal transformer

- 4-stage gain control

- Balanced remote sensing

- Two sets of large speaker terminals

Accuphase A-48 stereo power amplifier

 

 

  • Continuous Average Output Power (20–20,000 Hz): Stereo operation (both channels driven) - 400 watts per channel into 1 ohm, 200 watts per channel into 2 ohms, 100 watts per channel into 4 ohms, 50 watts per channel into 8 ohms. Monophonic operation (bridged connection) - 800 watts into 2 ohms, 400 watts into 4 ohms, 200 watts into 8 ohms. 
  • Total Harmonic Distortion: Stereo operation (both channels driven) - 0.05% with 2 ohm load, 0.03% with 4 to 16 ohm load. Monophonic operation (bridged connection) - 0.05% with 4 to 16 ohm load
  • Intermodulation Distortion: 0.01%
  • Frequency Response: At rated output: 20 – 20,000 Hz +0, -0.2 dB. At 1 watt output: 0.5 – 160,000 Hz +0, -3.0 dB
  • Gain: 28.0 dB (with GAIN selector at MAX) (Stereo and monophonic operation)
  • Gain Selection: MAX, -3 dB, -6 dB, -12 dB
  • Output Load impedance: Stereo operation - 2 to 16 ohms. Monophonic operation: 4 to 16 ohms
  • Damping Factor: 1000
  • Input Impedance: Balanced - 40 kilohms. Line - 20 kilohms
  • Signal-to-Noise Ratio (A-weighted, input shorted): 118 dB (GAIN selector at MAX), 123 dB (GAIN selector at -12 dB) At rated continuous average output
  • Output Level Meters: -60 dB to +3 dB (indication in dB and %) Logarithmic scale. Operation selector: OFF / NORMAL / HOLD (∞). Meter sensitivity selector (-20 dB). *Monophonic operation: same value displayed for left/right.
  • Power Requirements: AC 120 V/230 V, 50/60 Hz (Voltage as indicated on rear panel)
  • Power Consumption: 200 watts idle.
  • Maximum Dimensions: Width 465 mm, Height 211 mm, Depth 464 mm
  • Mass: 34.8kg

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