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 a 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.

Warranty:

1-year manufacturer’s warranty

Features:

  • 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 a power amplifier for fully balanced signal transmission, complemented by MCS+ topology and current feedback amplification circuitry
  • Strong power supply with a massive high-efficiency transformer and large filtering capacitors
  • Preamplifier and power amplifier sections can be used separately
  • Numeric indication of volume level

INTEGRATED STEREO AMPLIFIER
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 a 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.

Balanced AAVA volume control
As a first in an integrated amplifier, the E-650 features the sophisticated balanced AAVA-type volume control incorporated in Accuphase’s top-of-the-line preamplifier model C-3850. Balanced AAVA uses two AAVA circuits driven in a fully balanced configuration. This completely cancels out any external noise and results in an unsurpassed S/N ratio.

The output stage with power MOS-FETs in a triple parallel push-pull configuration
Triple parallel push-pull output stage with power MOS-FETs and power amplifier stage mounted on a large heat sink. Two identical units are arranged on the left and right sides of the chassis.

Balanced I/O
Instrumentation amplifier principle in the power amplifier for fully balanced signal transmission, complemented by MCS+ topology and current feedback amplification circuitry

Strong power supply with a massive high-efficiency toroidal transformer and large filtering capacitors.
The E-650 uses a massive power transformer with high output capability. Highly effective filtering is realized with two custom-made aluminum electrolytic capacitors, each with a large 50,000 μF rating.

Technical Specifications:

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
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)
Gain HIGH LEVEL INPUT → PRE 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