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OmnidirectionalCardioidBidirectionalAdvanced Audio Microphones CM-414

Multi-Pattern Condenser Microphone

The CM-414 is a 3-pattern FET condenser with a transformer-coupled output circuit.

Dave Thomas describes the circuit as a reproduction of the circuit in the AKG C 414 EB. It is a two-stage design, using two transistors. The second stage transistor lowers the impedance enough that the output transformer has a ratio of just 2:1, which causes less gain loss than would a higher-ratio transformer. According to Thomas, the result is that the 414EB circuit has twice the headroom of the U87 circuit.

Advanced Audio AK-12The capsule is Advanced Audio’s version of the AKG CK-12 capsule, called the AK12. It is a 34mm, edge-terminated design with diaphragms made of 6-micron Mylar.

The CM-414 is housed in a tapered cylindrical body. Three switches beneath the headbasket allow selection of three polar patterns (Cardioid, Omni, Figure-8), a -10dB pad, and a high-pass filter.

The mic ships with shockmount and aluminum road case.

The Advanced Audio Microphones CM-414 is also known as: CM414.


Pickup Patterns Pads & Filters
Omnidirectional (25 - 20,000 Hz)
Cardioid (25 - 20,000 Hz)
Bidirectional (25 - 20,000 Hz)
  • Pad: -10 dB (Via Switch)
  • Filter: LF Rolloff (Via Switch)
Capsule Dimensions Impedance SPL/Noise
Diaphragm diameter: 27.8mm
Capsule diameter: 34.4mm
Diaphragm gauge: 6 microns
200 Ohms (Low) Max SPL: 135 dB
Weight Length Max Diameter Interface(s)
n/a n/a n/a
  • 3-pin XLR male (1)
Power Specifications
  • Requires phantom power
  • Phantom voltage: 48v

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