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.
The E-650 has a Pure Class A operation (30 watts into 8 ohms). It's guaranteed linear power: 120 watts into 2 ohms, 60 watts into 4 ohms,30 watts into 8 ohms; and the preamplifier and power amplifier sections can be used separately.
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 unsurpassed S/N ratio.
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.
Instrumentation amplifier principle in power amplifier for fully balanced signal transmission, complemented by MCS+ topology and current feedback amplification circuitry
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.
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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)
Gain: HIGH LEVEL INPUT → PRE OUTPUT :18 dB, MAIN IN → OUTPUT: 28 dB
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