Shure Beta 91 Manual

GENERAL

The Shure BETA 91 is a high performance condenser microphone with a tailored frequency response designed specifically for kick drums and other instruments. It provides superb attack and "punch," and delivers studio quality sound, with minimal distortion even at extremely high sound pressure levels.
The BETA 91 features a half-cardioid pattern (cardioid in the hemisphere above the mounting surface) throughout its frequency range to insure high gain before feedback and excellent rejection of unwanted sound.

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

GENERAL RULES FOR PRODUCT USE

1. Aim the side of the microphone marked "Shure" toward the desired sound source and away from unwanted sources. This may not be obvious or intuitive, since cardioid microphones such as the BETA 91 have narrow pickup patterns.
2. Place the microphone as close as practical to the desired sound source (refer to the table below) to maximize signal-to-noise ratio.
3. Use only one microphone to pick up a single sound source.
4. Use the fewest number of microphones as practical.
5. Keep multiple microphones separated by a distance equal to at least 3 times the distance to the nearest sound source.

APPLICATIONS AND PLACEMENT

The most common BETA 91 application and placement technique is listed in the following table. Keep in mind that microphone technique is largely a matter of personal taste–there is no one "correct" microphone position.

INTERCONNECTING CABLE

A 4.6 m (15 ft) heavy-duty cable is supplied for connecting the BETA 91 microphone to the preamplifier. It may be desirable for the components to be located a greater distance apart. Up to 23 m (75 ft) of additional cable can be used between the BETA 91 microphone and the preamplifier without signal loss.

SPECIFICATIONS

Type
Cardioid condenser (electret bias)

Frequency Response
20 to 20,000 Hz (see Figure 1)
(measured at 304.8 mm [1 ft] from a spherical sound source, free field conditions)

Polar Pattern (See Figure 2)
Half-cardioid (cardioid in hemisphere above mounting surface), uniform with frequency, symmetrical around axis.

Output Level (at 1,000 Hz)
Open Circuit Voltage: –59 dBV/Pa* (1.1 mV) typical
*1 Pa = 94 dB SPL

Maximum SPL
(20 Hz to 20 kHz, less than 1% THD)
2.5 kΩ load: 160 dB
1 kΩ load: 156 dB

Preamplifier Output Clipping Level
(20 Hz to 20 kHz, less than 1% THD*)
2.5 kΩ load: 6 dBV (2.0 V)
1 kΩ load: 2 dBV (1.26 V)
*THD of the microphone preamplifier when applied input signal is equivalent to the cartridge output at specified SPL.

Dynamic Range
(20 Hz to 20 kHz, less than 1% THD, 2.5 kΩ 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 dB SPL

Output Impedance
150 Ω (actual)

Polarity
Positive pressure on diaphragm produces 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 dB equivalent 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 (3.75 in. x 5.08 in. x 0.75 in.)

Net Weight
382 grams (13.5 oz) less cable

Certification
Eligible to bear CE Marking. Conforms to European EMC Directive 89/336/EEC. Meets applicable tests and performance criteria in European Standard EN55103 (1996) parts 1 and 2, for residential (E1) and light industrial (E2) environments.

FURNISHED ACCESSORIES

REPLACEMENT PARTS

SERVICE STATEMENT

For additional service or parts information, please contact Shure's Service Department at 1–800–516–2525. Outside the United States, please contact your authorized Shure Service Center.

Documents / Resources

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