SHURE BETA-91A ไมค์กระเดื่อง

The Shure Beta 91A is designed for use with kick drums, as well as other traditional low-frequency applicastion including piano. Featuring an updated microphone capsule, integrated preamplifier, and XLR connection, Beta 91A offers a strong low-frequency response and is specifically tailored for bass frequency applications. The Beta 91A combines superior attack and punch for studio-quality sound, even at extremely high sound pressure levels (SPL)

-Uniform half-cardioid polar pattern for maximum gain-before-feedback and rejection of off-axis sound

-Precision-engineered low-profile design features integrated preamplifier and XLR connector to maximize setup
efficiency while minimizing stage clutter

-Frequency response tailored for kick drum/low frequency applications with a wide dynamic range for use in high SPL
environments

-Two-position contour switch to maximize attack and clarity depending on application: select the flat response setting
for natural sound in most applications or the “low-mid scoop” setting for a strong low frequency “punch” with plenty of
higher frequency attack

-Requires no external mounting or accessories for ease of use and storage

-Furnished with zipper pouch

Type
- Electret Condenser
Frequency Response
- 20 to 20,000 Hz
Polar Pattern
- Half-cardioid (cardioid in hemisphere above mounting surface)
Impedance
- 146 Ohms
Sensitivity (at 1 kHz, open circuit voltage)
- -48.5 dBV/Pa (3.8mV)
- 1 Pascal=94 dB SPL
Maximum SPL (1 kHz at 1% THD)
- 1000 Ohm load: 151 dB, 2500 Ohm load: 155 dB
Signal-to-Noise Ratio (referenced at 94 dB SPL at 1 kHz)
- 64 dB
- S/N ratio is difference between 94 dB SPL and equivalent SPL of self noise, A-weighted
Dynamic Range (at 1 kHz)
- 1000 Ohm load: 121.5 dB2500 Ohm load: 125.5 dB
Common Mode Rejection (20 Hz to 20 kHz)
- > 55 dB
Clipping Level (20Hz-20 kHz at 1% THD)
- 1000 Ohm load: 7.50 dBV, 2500 Ohm load: 12.5 dBV
- THD of microphone preamplifier when applied input signal is equivalent to cartridge output at specified SPL
Self Noise (typical, equivalent SPL, A-weighted)
- 29.5 dB SPL-A
Polarity
- Positive pressure on diaphragm produces positive voltage on pin 2 with respect to pin 3
Weight
- Net: 470 g (16.6 oz.)
Frequency Contour Switch
- 7 dB of attenuation centered at 400 kHz
Connector
- Three-pin professional audio (XLR), male, balanced
Power Requirements
- 11-52 Vdc phantom power, 5.6 mA

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