Accuphase E-700 Integrated Amplifier

About The Accuphase E-700 Integrated Amplifier

The Class A E-700 is an evolutionary integrated amplifier that incorporates numerous technologies from the 50^th anniversary flagship model, the E-800. The preamplifier section uses a Balanced AAVA type volume control with ANCC to create a balanced configuration from input to output and achieve driving perfection. 

The power amp stage that drives the speakers has been fortified from three elements to four, further increasing reliability. Experience the full breadth of emotion in live performances with the E-700’s superior expression. 

Balanced AAVA Type Volume Control Circuit: Conventional preamplifiers use variable resistors to adjust volume, which causes contacts to deteriorate and create grit as well as increase noise at normal volume levels. AAVA, however, produces multiple, widely varying signals from the input signal and controls volume by changing the combination of those signals. This achieves minimum noise levels at all volume levels without any grit. The E-700 relies on Balanced AAVA comprised of balanced AAVA circuits, reducing the overall noise level by 10% compared to conventional models at typical volume positions.

ANCC (Accuphase Noise and distortion Cancelling Circuit): The E-700’s I-V conversion amplifier uses the ANCC principle. ANCC uses a secondary amplifier to cancel out noise and distortion from the main amplifier. The secondary amplifier utilizes a low-noise amplifier (noise density: 1.5 nV/√Hz) to increase the effect of the ANCC. Incorporating this ANCC in the AAVA I-V conversion amplifier drastically improves noise performance, particularly when transitioning from low volume settings to typical volume positions.

High-Accuracy, High-Rigidity Volume Sensor Construction: The volume sensor mechanism carved from a single aluminium block ensures silky-smooth operation, a weighty operational feel, and accurate position detection. Operations with the remote commander are so quiet that mechanical noise is hardly noticeable.

Power Amplification Stage Configured as an Instrumentation Amplifier: The instrumentation amplifier circuitry’s equal impedance on the + and – sides and exceptional external noise suppression provide optimal performance for an audio amplifier.

Power Amplification Stage that Achieves Linear Output: The power amplification stage on both the left and right sides features a large heat sink and employs four-fold parallel push-pull power transistors driven in Class A to provide linear power output of 35 Watts into 8 Ohms, 70 Watts into 4 Ohms, and 140 Watts into 2 Ohms.

Power Supply Circuitry Delivers Steady Power: A strong power supply featuring a massive toroidal transformer and two high-voltage, large filtering capacitors (56,000 μF/50 V) offer a stable power supply at all times.

High Damping Factor Brings Out the Full Potential of Speakers: The damping factor represents the amplifier’s ability to drive the speakers. A damping factor of 1,000 (guaranteed) extracts the maximum potential from the loudspeakers.

Our Review

The Accuphase E-700 is a beautifully refined Class A integrated amplifier that blends cutting-edge engineering with the kind of effortless musicality you'd expect from a brand like Accuphase. Borrowing heavily from the flagship E-800, it delivers a taste of the top-tier in a more accessible package, while still packing in some seriously impressive tech. The Balanced AAVA volume control, enhanced with ANCC, offers whisper-quiet operation and striking clarity at any level - no grit, no guesswork, just pure signal. Its rock-solid construction, from the intricately machined aluminium volume sensor to the robust power stage with four parallel push-pull transistors, gives it a luxurious feel that’s matched only by its performance. With a guaranteed damping factor of 1,000 and class-leading noise suppression, the E-700 wrings every ounce of emotion and nuance from your music - whether you're spinning jazz at midnight or cranking a symphony on a Sunday.

Main Features & Specifications

• Design: Pure Class A Integrated Amplifier
• Integrated amplifier with fully balanced configuration from input to output
• Balanced AAVA type volume control
• High-accuracy, high-rigidity volume sensor construction
• Power amplification stage configured as an instrumentation amplifier
• Four-fold parallel push-pull configuration using power MOS-FETs driven in Class A
• High damping factor of 1,000
• Strong power supply with high-efficiency toroidal transformer and large filtering capacitors
• Protection circuitry using MOS-FET switches
• Rated Output (20 to 20,000 Hz)
  • 35 Watts into 8 Ohms
  • 70 Watts into 4 Ohms
  • 140 Watts into 2 Ohms
  • 160 Watts into 1 Ohm
• Total Harmonic Distortion (20 to 20,000 Hz, at rated output): 0.03% 8-16 Ohm Load, 0.05 % 2-4 Ohm Load
• Intermodulation Distortion 0.01 %
• Frequency Response: 20 to 20,000 Hz (+0, –0.5 dB)
• Damping Factor 1,000
• Input Sensitivity
  • Input (Balanced/Line): 83.9 mV
  • Main In (Balanced/Line): 666 mV
• Input Impedance
  • Input (Balanced): 40 kilohms
  • Input (Line): 20 kilohms
  • Main In (Balanced) 40 kilohms
  • Main In (Line): 20 kilohms
• Max. Input Voltage Input (Balanced/Line) 5.0 V
• Pre Output Voltage: 666 mV
• Pre Output Impedance: 50 Ohms
• Gain
  • Input (Balanced/Line) to Pre Output: 18 dB
  • Main In to Speaker Output: 28 dB
• Tone Controls Turnover Frequency and Adjustment Range
  • Bass: 300 Hz ±10 dB
  • Treble: 3 kHz ±10 dB
• Loudness Compensator: +6 dB (100 Hz)
• Attenuator: –20 dB
• S/N Ratio
  • Input (Balanced/Line): 103 dB
  • Main In (Balanced/Line): 117 dB
• Power Meters: Bar Graph Meters, Output Voltage (dB) using 26 points, with On/Off switch
• Headphones Jack: Compatible Impedance 8 Ohms or Higher
• Power Consumption
  • Idle: 178 W
  • In accordance with IEC 62368-1: 220 W
  • Stand-by: 0.3 W
• Optional Digital Input Board (DAC-60) Available
• Optional MM/MC Phono Analogue Input Board (AD-60) Available
• Finish: Champagne
• Dimensions (WxHxD): 465 x 191 x 428mm
• Weight: 24.9 kg
• Manufacturer's Warranty: 5 Years

Note: Features & Specifications Subject To Change Without Notice. E&OE.