TM1 PLUS

Omni-directional Test & Measurement Microphone Kit

The TM1 Plus is a 6 mm pre-polarized condenser microphone used for test and measurement applications. The TM1 is known for its linearity, accurate response, consistency, ease of use, and affordability.

Equipped with a uniformly controlled omnidirectional polar pattern, the TM1 condenser microphone is designed to capture acoustic measurements for room analysis software programs, real-time analyzers, and other sound control devices. With a flat frequency range of 20 Hz – 20 kHz, the TM1 is an excellent tool for sound engineers, sound companies, and recording enthusiasts.

The TM1 omnidirectional test and measurement microphone is designed, machined, assembled, and tested by Audix in the USA.

The TM1 Plus includes calibration data file* and sensitivity, threaded acoustic windscreen, and CA4231 machined calibration adapter.

Model Variations

TM1 – All brass 4-stage construction. Wide and linear response. Requires 18 – 52 V phantom power.

*Bruel & Kjaer® 4231 sound level calibrator or equivalent


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Transducer Type Pre-polarized Condenser
Frequency Response 20 Hz – 20 kHz +/-2 dB
Polar Pattern Omni
Output Impedance 200 ohms
Sensitivity 6 mV / Pa @ 1k
Equivalent Noise Level 28 dB (A weighted)
Signal to Noise Ratio 66 dB
Maximum SPL 130 dB with distortion <1% 140 dB Max
Power Requirements 24 – 48 V Phantom
Power Consumption 8.9 mA @ 48 Volts
Connector Switchcraft® or Audix mail XLR
Polarity Positive pressure on diaphragm produces positive voltage on pin 2 relative to pin 3 of output XLR connector
Materials / Finish 4 piece precision machined brass / Nickel Finish
Weight 132 g / 4.7 oz
Length 150 mm / 5.9 in
Download Spec Sheet

1x TM1 Test & Measurement Mic
1x WSTM1 Windscreen
1x SMT19 Shock Mount Clip
1x TM1CA4231 Calibration Adaptor for Use With 1-inch Calibrators
1x Sensitivity & Calibration Data CD