Microphone Shure SM87A

Microphone Type

Condenser

Frequency response

50Hz to 20000Hz

Micro pole model

Supercardioid

Microphone Sensitivity (at 1,000 Hz)

Open circuit voltage: –52.5 dBV / Pa (2.4 mV) (1 Pa = 94 dB SPL)

Total Impedance Micro

Rated at 150 ohms (100 ohms actual ± 20%)

Recommended minimum load impedance: 800 ohms

Total output impedance

1000 Ohm load at 1,000 Hz: –6 dBV (0.5 V)

Sound Pressure Threshold (at 1,000 Hz)

140.5 dB (0.25% THD, 1000 ohm load)

Self-noise

24 dB typical, A-weighted

26 dB typical, weighted per DIN 45 405

Negative Threshold (1000 ohms)

116.5 dB (maximum SPL level to volume A)

Signal-to-noise ratio

70 dB at 94 dB SPL (IEC 651)

The S/N ratio is the difference between 94 dB of Sound Pressure (SPL) and the equivalent Sound Pressure (SPL) of A-weighted self-noise.

Electrode

Positive pressure on the diaphragm produces a positive voltage on pin 2 compared to pin 3

Requires power supply

11 to 52 vdc, 1.2 mA

Bark

Aluminum with black satin and steel grille

Connection

Three-pin professional audio connector (male XLR type)

Weight

200 grams (7 oz)

Size

192 mm (7-9/16 in.) L x 50 mm (2 in.)