ไมค์กระเดื่อง SHURE BETA-91A

SHURE BETA-91A คอนเดนเซอร์ไมโครโฟน ไมค์กระเดื่อง

Kick Drum microphone

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The Shure Beta 91A is designed for use with kick drums, as well as other traditional low-frequency applications 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 


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Shure Beta 91A Condenser Boundary Microphone Features :

Type: Electret Condenser

Frequency Response: 20Hz-20kHz

Polar Pattern: Half-cardioid (cardioid in hemisphere above mounting surface)

Impedance: 146 Ohms

Sensitivity (at 1kHz, open circuit voltage): -48.5 dBV/Pa (3.8mV)

Maximum SPL ( kHz at 1% THD): 1,000 ohm load: 151dB; 2500 Ohm load: 155dB

Signal-to-Noise Ratio (referenced at 94 dB SPL at 1kHz): 64 dB

Dynamic Range (at 1kHz): 1,000 Ohm load: 121.5dB; 2500 Ohm load: 125.5dB

Common Mode Rejection (20Hz-20kHz): >55dB

Clipping Level (20Hz-20 kHz at 1% THD) 1,000 ohm load: 7.50dBV, 2,500 ohm load: 12.5dBV

Self Noise (typical, equivalent SPL, A-weighted): 29.5dB SPL-A

Polarity: Positive pressure on diaphragm produces positive voltage on pin 2 with respect to pin 3

Weight: 16.6 oz.

Frequency Contour Switch: 7dB of attenuation centered at 400Hz

Connector: 3-pin XLR, balanced

Power Requirements: 11-52 Vdc phantom power, 5.6 mA

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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 dB

2500 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