Shure Beta 91A Cardioid Electret Condenser Microphone
The Shure Beta 91A is specifically designed for kick drums and other bass instruments.
The Beta 91A combines superior "attack" and "punch" for studio quality sound,even at the extremely high sound pressure levels encountered inside a kick drum.Its boundary effect design produces a strong, solid low-end response that hasbeen specifically tailored for heavy bass applications.
The microphone's cardioid pattern provides outstanding gain-before-feedbackand excellent rejection of unwanted sound, making the Beta 91 ideal for liveconcert applications. The low profile design of the Beta 91 eliminates the needfor external mounting hardware - just throw it in your kick drum and play.
Shure Beta91A Microphone Features:
Frequency response shaped specifically for kick drums and other instruments
Wide dynamic range for use in high SPL environments
Low-profile design requires no external mounting hardware
Detachable cable for easy storage
Legendary Shure quality, ruggedness, and reliability
Shure Beta91A Microphone Specifications:
Type
Cardioid condenser(electret bias)
Frequency Response
20 to 20,000 Hz
Polar Pattern
Half-cardioid (cardioidin hemisphere above mounting surface), uniform with frequency, symmetricalaround axis.
OutputLevel (at 1,000 Hz)
Open CircuitVoltage: -59 dBV/Pa* (1.1 mV) typical
*1 Pa = 94 dB SPL
Maximum SPL
(20 Hz to 20 kHz, less than1% THD)
2.5 kilohm load: 160 dB
1 kilohm load: 156 dB
Preamplifier Output Clipping Level
(20Hz to 20 kHz, less than 1% THD*)
2.5kilohm load: 6 dBV (2.0 V)
1 kilohmload: 2 dBV (1.26 V)
*THD of themicrophone preamplifier when applied input signal is equivalent to the cartridgeoutput at specified SPL.
Dynamic Range
(20 Hz to 20 kHz, lessthan 1% THD, 2.5 kilohm load)
125 dB(max SPL minus A-weighted noise)
Output Noise
35 dB SPL (typical),A-weighted
Signal-to-Noise Ratio
59 dB re 94 dBSPL
Output Impedance
150 ohms (actual)
Polarity
Positive pressure on diaphragmproduces positive voltage on pin 2 with respect to pin 3
Power
Phantom Power: 48 Vdc +/- 4 Vdc(IEC-268-15/DIN 45 596), positive pins 2 and 3
Electromagnetic Hum Pickup
-7.5 dBequivalent SPL in 1 mOe field (60 Hz)
Cable
4.6 m (15 ft) heavy-duty,two-conductor shielded, TA4F to TA3F connectors
Case
Matte-black , painted, die-cast,zinc-alloy case with matte-black steel grille
Dimensions
95 mm x 129 mm x 19 mm (3.75in. x 5.08 in. x 0.75 in.)
Net Weight
382 grams (13.5 oz) lesscable
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