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Audio-Technica ATM31a
discontinued Cardioid Condenser Microphone
Description
The ATM31a is a cardioid condenser mic with a “fixed-charge back plate, permanently polarized condenser.”
- Ideal for close-up vocals, overheads, piano and strings
- Sound is similar to far more expensive studio microphones
- Low-mass diaphragm ensures minimum distortion
- Cardioid pattern provides added warmth when used close up
- Operates on battery or phantom power
Note that the specs change if you run the mic off an AA batter rather than phantom power. Using a battery:
- Impedance changes from 200 ohms to 270 ohms
- Dynamic range drops from 113 dB to 99 dB
- Sensitivity changes from -44dB (6.3 mV) to -45dB (5.6 mV)
The ATM31a is an improvement over the original ATM31 (circa 1981); the original specs follow:
- Freq. Resp.: 60 to 20,000 Hz
- Impedance: 600 ohms
- Sensitivity: -55 dBm
The Audio-Technica ATM31a is also known as: ATM31, ATM-31, ATM-31a.
The mic was released in 1981.
| Pickup Patterns | Pads & Filters |
|---|---|
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| Diaphragm size | Impedance | Max SPL |
|---|---|---|
| n/a | 200 Ohms (Low (50-1000 Ohms)) | 137 dB |
| Weight | Length | Max Diameter | Interface(s) |
|---|---|---|---|
| 200g (7.05oz) | 193mm (7.60'') | 50mm (1.97'') |
| Power Specifications |
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