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The Sennheiser MD 409 U 3
dynamic pressure gradient microphone

The Sennheiser MD 409 U 3
Photos courtesy of Mike Caldwell

The MD 409 U 3 is a dynamic microphone, especially suited for use with percussion and brass instruments. The following text is from Sennheiser publication 18588/A 02, which is dated May, 1986.


  • Undistorted transmission of powerful instruments and instrument amplifiers due to large surface membrane

  • Extremely good feedback protection due to pronounced directional characteristics

  • Good acoustical separation of the individual instruments, e. g. when recording percussion

  • Insensitive to handling noise due to shock-mounted system

  • Sound inlet basket made from stainless steel, therefore very robust

  • Needs only a little space due to flat, rectangular design

  • Genuine gold-plated sound inlet

  • Unbreakable quick release clamp

The Sennheiser MD 409 U 3

Technical data

  • Acoustical mode of operation: pressure gradient

  • Frequency response: 50-15,000 Hz

  • Directional characteristic: cardioid

  • Open circuit output voltage at 1,000 Hz: 1.18 mV/Pa ±2.5 dB

  • Electrical impedance at 1,000 Hz: 200Ω

  • Minimum load impedance: ≥200Ω

  • Connector: Three-pin XLR plug

  • Wiring: 2 and 3 = moving coil, 1 and housing = ground

  • Dimensions in mm: 55 × 34 × 134

  • Weight: approximately 180 grams

The Sennheiser MD 409 U 3

Frequency response
Frequency response

The Sennheiser MD 409 U 3

Spec sheet
Download the specification sheets for this mic.


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