Accuphase E-4000 Integrated Stereo Amplifier

Description 

The E-4000 integrated amplifier has emerged from separate amplifier technologies. The preamplifier section features AAVA using ANCC to allow for volume adjustments that maintain high levels of vibrancy. The power amp section employs balanced transmission utilizing the instrumentation amplifier principle to drive noise suppression to its limit. The E-4000 is equipped with a four-fold parallel push-pull configuration of power transistors driven in Class AB in the output stage to extract every last ounce of potential from the speakers and create soundscapes filled with subtlety.

Features

The Accuphase E-4000 features a revolutionary AAVA volume control and a four-fold parallel push-pull configuration of power transistors driven in Class AB. It delivers high power output of 180 watts into 8 ohms and 260 watts into 4 ohms, with the power amplification stage configured as an instrumentation amplifier. A high damping factor of 800 contributes to precise amplifier control, while the strong power supply incorporates a massive high-efficiency toroidal transformer and high-voltage, large filtering capacitors. Protection circuitry using MOS-FET switches provides reliable protection during operation.

Revolutionary AAVA Volume Control

The E-4000 features Accuphase’s unique AAVA (Accuphase Analog Vari-gain Amplifier) volume control, which eliminates variable resistors from the signal path. The refined low-noise AAVA circuit uses six parallel buffer amplifiers and a lower-impedance V-to-I converter with ANCC, achieving 20% lower noise than the E-480.

Robust Power Amplification Stage

The power amplification stage on both the left and right sides features large heat sinks and employs a four-fold parallel push-pull configuration of bipolar power transistors driven in Class AB. This configuration delivers a high-power output of 180 watts into 8 ohms and 260 watts into 4 ohms, providing strong loudspeaker-driving capability.

High Damping Factor

The E-4000 achieves a guaranteed damping factor of 800, representing a 33% increase over the former E-480. This high damping factor helps the amplifier drive the loudspeakers effectively and extract their full potential.

Power Supply Circuitry Designed for Optimum Stability

The E-4000 incorporates a strong power supply featuring a massive, specially made, high-efficiency toroidal transformer and two high-voltage, large filtering capacitors rated at 40,000 μF/80 V. The power amplifier modules are separated for the left and right channels, while the AAVA module is positioned at the front to minimise noise interference.

Powerful and Vivid Sound Reproduction

The E-4000 combines its refined AAVA volume control, robust four-fold parallel push-pull power amplification, high damping factor, and powerful power supply to extract the full potential of any loudspeaker. The result is sound overflowing with energy and vividness.

Protection Circuitry

MOS-FET switch-based protection circuitry provides reliable protection for the amplifier during operation.

Technical Specifications