Preamp Gain; Specifications - Shure MX391 Manual

5. Replace grille with screw. Do not overtighten.
Do not attempt to detach the cable from the microphone, as damage may result.

Preamp Gain

If necessary, the preamplifier gain can be reduced by 12 dB. Contact an authorized Shure service center for information.

Specifications

All measurements taken with microphone mounted on a wooden surface (76 x 76 cm)
Type
Electret Condenser
Frequency Response
50–17000 Hz
Polar Pattern
MX391/C
MX391/S
MX391/O
Output Impedance
180 Ω
Output Configuration
Active Balanced
Sensitivity
@ 1 kHz, open circuit voltage
Cardioid
Supercardioid
Omnidirectional
1 Pa=94 dB SPL
Maximum SPL
1 kHz at 1% THD, 1 kΩ load
Cardioid
Supercardioid
Omnidirectional
Cardioid
Supercardioid
Omnidirectional
–30 dBV/Pa(33.5 mV)
–28 dBV/Pa(38.5 mV)
–22 dBV/Pa(81.4 mV)
Shure Incorporated
119 dB
118 dB
111 dB
5/7