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Advanced Audio Microphones CM-67

Pricing & Availability

  • MSRP: $765

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CM-67 Documentation

9 polar patternsAdvanced Audio Microphones CM-67

Multi-Pattern Tube Condenser Microphone

The CM-67 is a large-diaphragm, multipattern tube microphone intended to recreate the sonics of the Neumann U67.

The large-diaphragm capsule is called the “AK-67;” it is a 35mm OD design, with ~29mm diaphragms made of 6-micron Mylar. Like its namesake, the Neumann K67, it is a center-terminated, dual-backplate capsule. According to Dave Thomas, it incorporates design changes engineered by John Peluso and Werner Ruvalds to give the capsule a less-boosted high-frequency response.

The tube is a 6072a dual triode. This differs from the EF86 pentode used in the U67.

The transformer is described by Dave Thomas as a 6.5:1 BV8 (not a BV11, as is reported elsewhere). This BV8 is a Chinese-made copy of the transformer used in the Neumann U47.

The amplifier design is a CCDA, or “constant current draw amplifier.” This circuit is used in the company’s CM47 and CM12; the primary differences between these three microphones are the capsules, output transformers, and headbasket designs.

The CM-67 includes an elastic shockmount and a flight case. Advanced Audio also sells the “CM-67SE,” which includes a pad and filter, and a tapered body with sloped grille as used in the original U67.

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Specifications

Pickup Patterns Pads & Filters
Omnidirectional (n/a mV/Pa; 25 - 20,000 Hz)
Cardioid (n/a mV/Pa; 25 - 20,000 Hz)
Bidirectional (n/a mV/Pa; 25 - 20,000 Hz)
Capsule Dimensions Impedance SPL/Noise
Diaphragm diameter: 28.7mm
Capsule diameter: 35.1mm
Diaphragm gauge: 6 microns
n/a Max SPL: 125 dB
Self-noise: 17.0 dB(A)
Weight Length Max Diameter Interface(s)
n/a n/a n/a
  • 3-pin XLR male (1)
Power Specifications
  • Includes tube power supply

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