Product Description
— Product Description
Introduction
The E-4000 builds on Accuphase’s legacy of separate-amp excellence by combining a no-compromise preamplifier section with a powerful Class-AB output stage. Featuring AAVA™ volume control enhanced with ANCC noise-cancellation, it delivers 180 W into 8 Ω and 260 W into 4 Ω with ultra-low distortion and a guaranteed damping factor of 800—bringing exceptional clarity, dynamics, and control to any speaker.
Design
Housed in a rigid, low-resonance aluminum chassis, the E-4000 separates its input, preamp, and power-amp circuits for maximum noise immunity. The preamplifier uses Accuphase’s patented AAVA vari-gain architecture with an ANCC sub-amplifier to cancel noise at all volume levels, while the power amp employs a four-fold parallel push-pull transistor array driven as an instrumentation amplifier for exemplary linearity and transient response. A massive toroidal transformer and 40,000 µF of filter capacitance ensure rock-steady power delivery.
Application
As a high-end integrated solution, the E-4000 accepts up to five line-level sources (including two balanced XLR), plus optional DAC or phono boards. Use it to drive speakers directly or feed a separate power amp via its balanced and single-ended pre-out jacks. Its remote-controlled input selection, tone controls, loudness compensation, and bi-amp switching make it equally at home in two-channel and surround environments.
Technology Overview
- AAVA™ with ANCC
Variable-gain volume control creates multiple signal paths and uses a secondary amplifier to cancel noise, achieving virtually grit-free operation at any level. - Instrumentation-Amplifier Power Stage
Balanced transmission and feedback in both +/– halves suppress external interference, while four transistors per channel in push-pull Class AB extract maximum power with minimal distortion. - Balanced Remote Sensing
Monitors both signal and ground at the speaker terminals, further enhancing damping and speaker control. - Modular Expansion
Three option-board slots accept DAC or phono equalizer cards (DAC-60/50/40, AD-50/30/20, LINE-10), enabling full customization of your digital and analog inputs.
Key Features
- AAVA™ analog vari-gain volume control with ANCC noise cancellation
- Class-AB four-fold parallel push-pull power transistors (180 W/8 Ω; 260 W/4 Ω)
- Guaranteed damping factor of 800
- Dual toroidal transformers and 40,000 µF filtering capacitors
- Five line inputs (2× XLR balanced, 3× RCA unbalanced)
- Balanced and single-ended preamp outputs
- Headphone jack with dedicated high-quality amplifier
- Remote control, tone controls, loudness, phase, and mono functions
- Bi-amp switch and speaker-output protection circuitry
- Optional DAC and phono equalizer board compatibility
Specifications
Specifications
Unit Dimensions (W × H × D): 465 mm × 181 mm × 428 mm (18.3″ × 7.1″ × 16.9″)
Net Weight: 24.9 kg (54.9 lbs)
Shipping Weight: 31 kg (69 lbs)
Power & Electrical
Rated Voltage: Factory-set for 120 V, 220 V, or 230 V AC, 50/60 Hz
Power Consumption (Idle): 54 W
Maximum Power Consumption (IEC 62368-1): 248 W
Stand-by Power: 0.3 W
Output Power
Both Channels Driven (1 kHz, 1 % THD)
• 8 Ω: 180 W per channel
• 4 Ω: 260 W per channel
Distortion & Noise
Total Harmonic Distortion (20 Hz–20 kHz, rated output): 0.05 %
Intermodulation Distortion (CCIF): 0.01 %
Signal-to-Noise Ratio (A-weighted, input shorted):
• Balanced Input: 102 dB
• Line Input: 109 dB
• Main In: 125 dB
Frequency Response
• At rated output (Balanced/Line In): 20 Hz–20 kHz (0 / –0.5 dB)
• At rated output (Main In): 20 Hz–20 kHz (0 / –0.2 dB)
• At 1 W output (Main In): 3 Hz–150 kHz (–3 dB)
Damping Factor
800
Inputs
• Five sets of unbalanced Line inputs (RCA)
• Two sets of balanced Line inputs (XLR)
• Main In (Balanced/Line) for bi-amping or external preamp use
Input Sensitivity & Impedance
• For rated output:
– Line/Balanced In: 190 mV
– Main In: 1.51 V
• For 1 W output:
– Line/Balanced In: 14.2 mV
– Main In: 113 mV
• Input Impedance: 20 kΩ (Line), 40 kΩ (Balanced)
• Maximum Input Voltage: 5.0 V
Outputs
• Speaker terminals A/B (two pairs)
• Preamp Outputs (Balanced RCA and XLR): 1.51 V at rated output; 50 Ω
• Headphone Jack (≥ 8 Ω headphones)
Gain & Tone Controls
• Main Gain (Main In → Speaker): 28 dB
• Preamp Gain (Line/Balanced In → Pre Out): 18 dB
• Bass Control: 300 Hz ±10 dB
• Treble Control: 3 kHz ±10 dB
• Loudness Compensator: +6 dB at 100 Hz
• Attenuator: –20 dB
Meters & Displays
• Large analog power meters (logarithmic peak display to –50 dB)
• Input and level indicators
Key Features
• AAVA volume control with ANCC noise-canceling topology
• Class AB power stage with four-fold parallel push-pull output transistors
• Instrumentation-amplifier-principle balanced transmission
• Massive toroidal transformer and 40,000 µF ×2 filter capacitors per channel
• MOS-FET protection switches and high-carbon cast-iron insulator feet
• Expandable via option slots for DAC or phono boards
• Remote control and front-panel controls for all functions
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