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Advanced Audio Microphones CM-28

Pricing & Availability

  • MSRP: $535

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Reviews & News

CM-28 Documentation

OmnidirectionalCardioidHypercardioidWide CardioidAdvanced Audio Microphones CM-28

Detachable-Capsule Pencil Tube Condenser Microphone

The Advanced Audio CM28 is a small-diaphragm tube condenser with detachable capsules.

The CM28 ships with three capsules: Omni; Cardioid; Hypercardioid. A wide cardioid capsule is available separately.

The mic actually uses both vacuum tube and FET circuitry to optimize headroom and gain, see quote below.

Dave Thomas

Our circuit provides at least 6db more headroom than traditional fet/transformer circuits. We do this with a fet front end designed to capture all the detail of the capsule, which is then coupled into a 6J1b tube driving our BV11 transformer. This approach takes full advantage of a low noise fet circuit. The tube stage then needs to provide very little gain so it is configured as a Low Z driver. The tube provides the fet with a very high impedance load so the fet’s headroom can be maximized.

Switches on the mic body provide -15dB attenuation and LF rolloff (not specified). The mic attaches to the external power supply by 7-pin XLR.

Tape Op - 2011

The thing I keep realizing when using Advanced Audio’s mics, is that they are really well balanced. I never find any sonic anomalies in the response. This is again true with the CM-28.

Furthermore, the CM-28 does not display any of the “cheaper condenser zing” that can get so quickly tiring. It also doesn’t have quite as much top end as some SDCs that I’ve tried, but that is not to say that it is at all dull or lifeless.

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Specifications

Compatible Capsules
Advanced Audio Microphones CM-28 CardioidCardioid Advanced Audio Microphones CM-28 Cardioid
Cardioid capsule
Sensitivity: 14 mV/Pa
Freq. Resp.: 20 - 20,000 Hz
MSRP: $59 | Still In Production
Advanced Audio Microphones CM-28 HypercardioidHypercardioid Advanced Audio Microphones CM-28 Hypercardioid
Hypercardioid capsule
Sensitivity: 14 mV/Pa
Freq. Resp.: 20 - 20,000 Hz
MSRP: $59 | Still In Production
Advanced Audio Microphones CM-28 OmniOmnidirectional Advanced Audio Microphones CM-28 Omni
Omnidirectional capsule
Sensitivity: 14 mV/Pa
Freq. Resp.: 20 - 20,000 Hz
MSRP: $59 | Still In Production
Advanced Audio Microphones CM-28 Wide CardioidWide Cardioid Advanced Audio Microphones CM-28 Wide Cardioid
Wide Cardioid capsule
Sensitivity: 14 mV/Pa
Freq. Resp.: 20 - 20,000 Hz
MSRP: $59 | Still In Production
Pads & Filters Impedance SPL/Noise
  • Pad: -15dB (Via Switch)
  • Filter: LF Rolloff (Via Switch)
200 Ohms (Low) Max SPL: 135 dB
Self-noise: 18.0 dB(A)
Weight Length Max Diameter Interface(s)
119g (4.20oz) 140mm (5.51'') 21mm (0.83'')
  • 3-pin XLR male (1)
Power Specifications
  • Includes tube power supply

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