Accuphase A-48 Class-A Stereo Power Amplifier

$15,000.00

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Details

Specifications

Power Amplifier (Class-A, 2x45w).

Featuring a six-fold parallel push-pull architecture with power MOS-FETs, as well as ideal gain allocation realized 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.

Features

  • Pure Class A operation delivers quality power: 45 watts x 2 into 8 ohms
  • Power MOSFET output stage features 6-parallel push-pull configuration
  • Instrumentation amplifier principle
  • 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 Class-A stereo power amplifier A-48

  • Continuous Average Output Power (20–20,000 Hz): Stereo operation (both channels driven) - 360 watts per channel into 1 ohm, 180 watts per channel into 2 ohms, 90 watts per channel into 4 ohms, 45 watts per channel into 8 ohms. Monophonic operation (bridged connection) - 720 watts into 2 ohms, 360 watts into 4 ohms, 180 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: 500
  • Input Sensitivity (with 8-ohm load, GAIN selector in MAX position): Stereo operation - 0.76 V for rated continuous average output (30 W). 0.11 V for 1 watt output. Monophonic operation - 1.51 V for rated continuous average output (120 W). 0.11 V for 1 watt output
  • Input Impedance: Balanced - 40 kilohms. Line - 20 kilohms
  • Signal-to-Noise Ratio (A-weighted, input shorted): 115 dB (GAIN selector at MAX), 120 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. 410 watts in accordance with IEC 60065
  • Maximum Dimensions: Width 465 mm, Height 211 mm, Depth 464 mm
  • Mass: 31.9 kg net, 39.0 kg in shipping carton