Used Shure 91 Half-cardioid Condenser Kick Drum Microphone

Cardioid condenser (electret bias)

Kick Drum

20 to 20,000 Hz

Half-cardioid (cardioid in hemisphere above mounting surface), uniform with frequency, symmetrical around axis.

Output Impedance 150 ohms (actual)
Signal-to-Noise Ratio 59 dB re 94 dB SPL

At 1,000 Hz: Open Circuit Voltage: 59 dBV/Pa* (1.1 mV) typical (1 Pa = 94 dB SPL)
Maximum SPL (20 Hz to 20 kHz, less than 1% THD) 2.5 k ohms load 160 dB 1 k ohms load 156 dB
Preamplifier Output Clipping Level (20 Hz to 20 kHz, less than 1% THD*) 2.5 k ohms load 6 dBV (2.0 V) 1 k ohms load 2 dBV (1.26 V) Dynamic Range (20 Hz to 20 kHz, less than 1% THD, 2.5 k ohms load) 125 dB (max SPL minus A-weighted noise)
Output Noise 35 dB SPL (typical), A-weighted

Cable 4.6 m (15 ft) heavy-duty, two-conductor shielded, TA4F to TA3F connectors

Positive pressure on diaphragm produces positive voltage on pin 2 with respect to pin 3
Case: Matte-black , painted, die-cast, zinc-alloy case with matte-b lack

95 mm x 129 mm x 19 mm (3.75 in. x 5.08 in. x 0.75 in.)

382 grams (13.5 oz) less cable

Power Phantom Power: 48 Vdc +/-4 Vdc (IEC-268-15/DIN 45 596), positive pins 2 and 3.
Electromagnetic Hum Pickup -7.5 dB equivalent SPL in 1 mOe field (60 Hz)