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Accuphase E-650 Class A Integrated Amplifier


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for orders over $100 or $5 under $100.

Product Description

Innovative engineering and top-grade parts and materials come together in this product featuring the superb Balanced AAVA type volume control and a triple parallel arrangement of power MOS-FETs in the output stage. The power amplifier section employs the latest instrumentation amplifier configuration for balanced signal transmission, resulting in an integrated amplifier with fully balanced configuration from the inputs right through to the output. The massive power supply and low-impedance output circuitry deliver 150 watts per channel (into 1 ohm, with music signal) and a damping factor of 800.


  • First integrated amplifier featuring Balanced AAVA volume control
  • Pure Class A operation(30 watts into 8 ohms)
  • Guaranteed linear power: 120 watts into 2 ohms, 60 watts into 4 ohms,30 watts into 8 ohms
  • Output stage with power MOS-FETs in triple parallel push-pull configuration
  • Instrumentation amplifier principle in power amplifier for fully balanced signal transmission, complemented by MCS+ topology and current feedback amplification circuitry
  • Strong power supply with massive high-efficiency transformer and large filtering capacitors
  • Preamplifier and power amplifier sections can be used separately
  • Numeric indication of volume level


  • Rated Continuous Average Output Power (both channels operating simultaneously, 20 - 20,000 Hz) : 150 W/ch  1-ohm load (music signal only), 120 W/ch  2-ohm load, 60 W/ch  4-ohm load, 30 W/ch  8-ohm load
  • Total Harmonic Distortion (both channels operating simultaneously, 20 - 20,000 Hz): 0.05% 2-ohm load, 0.03% 4 to 16 ohm load
  • Intermodulation Distortion: 0.01%
  • Frequency Response
    HIGH LEVEL INPUT, At rated continuous average output: 20  -   20,000 Hz +0, –0.5 dB
    MAIN IN, At rated continuous average output:  20  -   20,000 Hz +0, –0.2 dB, At 1 watt output:3  - 150,000 Hz +0, –3.0 dB
  • Damping Factor: 800 (with 8-ohm load, 50 Hz)
  • Input sensitivity and impedance (rated output/1W output/Impedance): High Level input -77.7mV/14.2mV/20kΩ, Balanced Input -77.7mV/14.2mV/40kΩ, Main In Line-0.617V/113mV/20Ω, Main In Balanced -0.617V/113mV/40kΩ
  • Output Voltage and Impedance: PRE OUTPUT 0.617 V, 50 ohms (at rated continuous average output)
  • Tone Controls - Turnover frequency and adjustment range: BASS; 300 Hz   ±10 dB (50 Hz),TREBLE; 3 kHz   ±10 dB (20 kHz)
  • Loudness compensator: +6dB(100 Hz)
  • Attenuator: ─20 dB
  • S/N Ratio, Input-converted Noise (SN ratio at rated output/SN ratio EIA): High level Input - 102dB/97dB, Balanced input - 102dB/97dB, Main In - 117dB/101dB
  • Bar Meter: Represents output voltage value (dB) using 26 points With meter on/off switching function
  • Output Load Impedance: 2 to 16 ohms
  • Stereo Headphones Suitable impedance: 8 ohms or higher
  • Power Requirements: 230v AC, 50Hz
  • Dimensions (WxHxD, mm): 465 x 191 x 428
  • Weight: 25.3kg net, 32kg shipped