Cambridge Audio AZUR 640C CDP discrete opamp DIY

Cambridge Audio Azur 640C CD player upgrade with Burson Discrete V4 opamp

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I am really impressed with this upgrade, as the Burson Audio parts have really taken this unit to a whole new level.

Bass has become deeper & much controlled. Mids are excellently rich & warm, while highs are crystal clear, crisp, and natural. Sound stage has become more open with realistic depths.

Overall presentation is excellent. Thanks also in part to its very good Wolfson DAC. You must upgrade one to believe it.

Best Regards, Ronald

The System

Listening with

Cambridge Audio Azur 640C

Burson

Burson V4 Opamp · Discrete opamp (single / dual) · discontinued
  • Supply voltage: ±5 V to ±20 V (absolute maximum)
  • Gain-bandwidth product: 50 MHz (at 100 kHz)
  • Dual or single: dual and single
  • Package: dual 40 mm × 16 mm × 20 mm; single 40 mm × 16 mm × 14 mm; 8-pin

[1] [2]

Specs from manufacturer data unless a source below says otherwise. “calc.” values are worked out from those figures (V = √(P × R); 110 dB SPL used as a loud reference level). Gear listed without specs is not in our spec library yet.

  1. Burson V4 Opamp datasheet V1.1
  2. Burson V4 Opamp product page (archived 2015)