The Sennheiser MD 409 U 3
dynamic pressure gradient microphone
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.
Features
- 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
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
Frequency response
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