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9 polar patternsART Pro Audio M-Four

Multi-Pattern Tube Condenser Microphone

The M-Four is ART’s flagship microphone. It is a multipattern bottle-style mic with a large-diameter capsule and a tube preamplifier.

The condenser capsule is a 34mm, dual-diaphragm design. The diaphragm diameter is likely 27-28mm.

Two switches on the microphone body provide access to a -10dB pad and a high-pass filter (the slope and crossover points of which have not been published).

The microphone’s amplifier circuit is built around a 12AX7 tube. It is powered by an external power supply, which is a dual-voltage design. A switch on the power supply enables selection of 9 pickup patterns.

The mic’s shockmount appears to have been modeled after the Brauner shockmount. A metal C-clamp mounts to the mic body from behind, and is suspended within a larger C-clamp by elastic bands. This deign grips the mic from the sides and rear, allowing closer positioning of the mic’s face to the sound source.

ART M-Four kitThe M-Four ships in a padded wooden storage box, a dual-voltage power supply, shockmount, and an aluminum flight case.

The mic was introduced at the Summer NAMM show, 2009, and is scheduled for release in August.

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The mic was released in 2009.


Pickup Patterns Pads & Filters
Omnidirectional (12 mV/Pa; 20 - 20,000 Hz)
Cardioid (12 mV/Pa; 20 - 20,000 Hz)
Bidirectional (12 mV/Pa; 20 - 20,000 Hz)
  • Pad: -10dB (Via Switch)
  • Filter: HPF (Via Switch)
Capsule Dimensions Impedance SPL/Noise
Capsule diameter: 34mm
200 Ohms (Low) Max SPL: 134 dB
Self-noise: 20.0 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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