Accuphase Laboratory, Inc.

Accuphase E-4000 Integrated Amplifier

The NEW E 4000 integrated amplifier is a succession model of E-480, the 12th generation Accuphase Class-AB high-power integrated stereo amplifier. The Preamplifier section provides a low-noise AAVA volume control with a fully refined circuit configuration and layout. The Power amplifier section adopted the bipolar transistors in a four-fold parallel push-pull arrangement and made a significant achievement for the driving ability of loudspeakers. The E-4000 extracts the full potential of any loudspeaker to reproduce sound overflowing with energy and vividness.

  • Revolutionary AAVA volume control
  • Four-fold parallel push-pull configuration of power transistors driven in Class AB
  • High power output of 180 watts into 8 ohms / 260 watts into 4 ohms
  • Power amplification stage configured as instrumentation amplifier
  • High damping factor of 800
  • Strong power supply with massive high-efficiency toroidal transformer
  • High-voltage, large filtering capacitors
  • Protection circuitry using MOS-FET switches
Robust power amplification stage

The power amplification stage on both the left and right sides is equipped with a large heat sink and employs four-fold parallel push-pull power transistors driven in Class AB to provide rated, high-power output of 180 watts into 8 ohms and 260 watts into 4 ohms.

High damping factor brings out the full potential of the loudspeakers

The damping factor represents the amplifier’s ability to drive the speakers. A damping factor of 800 (guaranteed) extracts the maximum potential from the loudspeakers.

Power supply circuitry designed for optimum stability

A strong power supply featuring a massive toroidal transformer and two high-voltage, large filtering capacitors (40,000 μF/80 V) offers a stable power supply at all times.

 

The Preamplifier section provides a low-noise AAVA volume control with a fully refined circuit configuration and layout. The Power amplifier section adopted the bipolar transistors in a four-fold parallel push-pull arrangement and made a significant achievement for the driving ability of loudspeakers. The E-4000 extracts the full potential of any loudspeaker to reproduce sound overflowing with energy and vividness.

A strong power supply with a massive, specially-made, high-efficiency toroidal transformer and 40000μF filtering capacitors are installed in the unit's center. In addition, the two power amplifier modules are kept separate for the left and right channels. The AAVA module is set at the front of the unit to avoid noise interference.

The AAVA (Accuphase Analog Vari-gain Amplifier) is a volume control principle that eliminates all variable resistors from the signal path. This AAVA volume control is Accuphase's unique technology.

The E4000's AAVA module contains six paralleled buffer amplifiers and the lower-impedance V to I converter and utilizes the ANCC, so the E-4000 achieved 20% lower noise than the E-480.

The E-4000 achieves a guaranteed damping factor of 800. It is 33% higher than the former model E-480 and has the same value as Class-A stereo power amplifier A-48.

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