Ultra-Compact Side-Address Instrument Microphone

The Shure Beta Microphone Series BETA 181 is an ultra-compact, small-diaphragm side-address condenser microphone, designed for discreet placement and control in live and studio environments. The BETA181 features interchangeable cardioid, supercardioid, omnidirectional and bidirectional capsule options for superior versatility, the small diaphragm design provides superior audio with consistent, textbook polar responses in a form factor small enough to get close to the source in the tightest conditions.

→ Premier live performance microphone with Shure quality, ruggedness, and reliability
→ Compact preamp attaches to four interchangeable capsules
→ Wide dynamic range for use in high SPL environments
→ Side-address form allows for discreet positioning in tight performance and recording settings
→ Innnovative locking ring provides a secure connection between capsule and preamp
→ Hardened steel mesh grille resists denting, wear, and abuse
→ Compact design, under 12 cm (5 in.), reduces stage clutter
→ Furnished with stand adapter and carrying case

Cartridge Type	Electret Condenser
Polar Pattern	181/C= Cardioid; 181/S= Supercardioid; 181/O= Omnidirectional; 181/BI= Bidirectional
Frequency Response	20 to 20,000 Hz
Output Impedance	110 O
Sensitivity open circuit voltage, @ 1 kHz, typical	Cardioid= –46.5 dBV/Pa[1] (2.4 mV); Supercardioid= –49.5 dBV/Pa[1] (2.5 mV); Omnidirectional= –52.0 dBV/Pa[1] (2.6 mV); Bidirectional= –51.0 dBV/Pa[1] (2.6 mV)
Maximum SPL 1 kHz at 1% THD[2]	2500 O load= Cardioid: 151.5 dB SPL; Supercardioid= 154.5 dB SPL; Omnidirectional= 157.0 dB SPL; Bidirectional= 156.0 dB SPL
Maximum SPL 1 kHz at 1% THD[2]	1000 O load= Cardioid: 149.0 dB SPL; Supercardioid= 152.0 dB SPL; Omnidirectional= 154.0 dB SPL; Bidirectional= 153.5 dB SPL
Signal-to-Noise Ratio[3]	Cardioid= 73.5 dB; Supercardioid= 71.5 dB; Omnidirectional= 70.5 dB; Bidirectional= 71.0 dB
Dynamic Range 2500 O load	Cardioid: 131.0 dB; Supercardioid= 132.0 dB; Omnidirectional= 133.5 dB; Bidirectional= 133.0 dB
Dynamic Range 1000 O load	Cardioid: 128.5 dB; Supercardioid= 129.5 dB; Omnidirectional= 130.5 dB; Bidirectional= 130.5 dB
Clipping Level @ 1 kHz, 1% THD	2500 O load= 10.5 dBV
Clipping Level @ 1 kHz, 1% THD	1000 O load= 7.5 dBV
Self Noise equivalent SPL, A-weighted, typical	Cardioid= 20.5 dB SPL-A; Supercardioid= 22.5 dB SPL-A; Omnidirectional= 23.5 dB SPL-A; Bidirectional= 23.0 dB SPL-A
Common Mode Rejection 20 to 20,000 kHz	>_55 dB
Polarity	Positive pressure on diaphragm produces positive voltage on pin 2 with respect to pin 3
Power Requirements	11–52 V DC[4] phantom power (IEC-61938) 2.4 mA, maximum
Net Weight	145 g (5.1 oz.)