Product Description
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The Shure SM81 is a high-quality, unidirectional condenser
microphone designed for studio , broadcasting, and sound
reinforcement. Its wide frequency response, low noise
characteristics, and low RF susceptibility have made it a
standard for applications involving acoustic instruments,
especially guitar, piano, and cymbals. POWER REQUIREMENTS NOTE:
This microphone requires phantom power and performs best with a
48 Vdc supply (IEC-61938). However, it will operate with slightly
decreased headroom and sensitivity with supplies as low as 11
Vdc. Most modern mixers provide phantom power. You must use a
balanced microphone cable: XLR-to-XLR or XLR-to-TRS.
.com
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Built to withstand the rigors of regular stage and studio use,
the Shure SM81 unidirectional condenser microphone is a great
choice for studio , broadcasting, and sound
reinforcement. Its wide frequency response, low noise
characteristics, and low RF susceptibility make it a perfect
match for applications involving acoustic instruments, especially
guitar, piano, and cymbals.
Ruggedly constructed, the SM81 operates on phantom power and
performs over a wide range of temperatures and humidity
conditions. It comes with a swivel adapter, attenuator-switch
lock, foam windscreen, and case for carrying and storage.
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Key Features
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Frequency response.
Polar pattern.* Flat response curve for accurate reproduction of
sound sources
* Low noise and high output clipping level
* Low distortion over a wide range of load impedances
* Cardioid polar pattern, uniform with frequency and symmetric
about axis, providing maximum rejection and minimum coloration of
off-axis sounds
* Low RF susceptibility
* Selectable low-frequency response: flat, 6 or 18 dB/octave
rolloff
* 0 dB/10 dB lockable attenuator switch
* Phantom powering (DIN 45 596 voltages of 12 to 48 Vdc)
* Rugged steel construction for durability
* Field-usable over wide range of temperature and humidity
conditions
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Specifications
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* Type: Condenser (electret bias)
* Frequency Response: 20 to 20,000 Hz
* Polar Pattern: Cardioid (unidirectional) response-uniform with
frequency, symmetrical about axis
* Output Impedance: Rated at 150 ohms (85 ohms actual)
Recommended minimum load impedance: 800 ohms (May be used with
loads as low as 150 ohms with reduced clipping level)
* Output Configuration and Connector: Balanced,
transformer-coupled output; male XLR connector
* Sensitivity (at 1,000 Hz): Open Circuit Voltage: -45 dBV/Pascal
(5.6 mV); (1 Pascal = 94 dB SPL)
* Clipping Level (at 1,000 Hz): 800 ohm Load: -4 dBV (0.63 V);
150 ohm Load: -15 dBV (0.18 V)
* Total Harmonic Distortion Less than 0.5% (131 dB SPL at 250 H:
z into 800 ohm load)
* Maximum SPL (at 1,000 Hz): * 800 ohm load: 136 dB (attenuator
at 0) 146 dB (attenuator at -10)
* 150 ohm load: 128 dB (attenuator at 0) 138 dB (attenuator at
-10)
* Hum Pickup: -3 dB equivalent SPL in a 1 mOe field (60 Hz)
* Self-Noise (equivalent sound pressure levels; measured with
true rms voltmeter): 16 dB typical, A-weighted; 19 dB typical,
weighted per DIN 45 405
* Signal-to-Noise Ratio: 78 dB (IEC 651)* at 94 dB SPL *S/N ratio
is difference between 94 dB SPL and product's equivalent self
noise (SPL A-weighted).
* Overvoltage and Reverse Polarity Protection: * Max. external
voltage applied to pins 2 and 3 with respect to pin 1: +52 Vdc
* Reverse polarity protection: 200 mA max. (diode-clamped)
* Polarity: Positive pressure on diaphragm produces positive
voltage on pin 2 relative to pin 3
* Cartridge Capacitance: 54 pF
* Low Frequency Response Switch Positions: Flat; -6 dB/octave
below 100 Hz; -18 dB/octave below 80 Hz
* Attenuator Switch Positions (Lockable): 0 or -10 dB
* Power: * Supply Voltage: 11 to 52 Vdc, positive, pins 2 and 3
* Current Drain: 1.2 mA max.
* Case: Steel construction with vinyl metallic paint finish and
stainless steel screens
* Weight: 8 ounces
- This microphone requires phantom power and performs best with a 48 Vdc supply (IEC-61938). However, it will operate with slightly decreased headroom and sensitivity with supplies as low as 11 Vdc. Most modern mixers provide phantom power. You must use a balanced microphone cable: XLR-to-XLR or XLR-to-TRS..
- The SM81 is ruggedly constructed. It operates on phantom power and performs over a wide range of temperatures and humidity conditions. It is furnished with a swivel adapter, attenuator-switch lock, foam windscreen, and case for carrying and storage. Other accessories are available..
- 20 Hz to 20 kHz frequency response. Flat response curve for accurate reproduction of sound sources..
- Low noise and high output clipping level. Low distortion over a wide range of load impedances..
- Cardioid polar pattern, uniform with frequency and symmetric about axis, providing maximum rejection and minimum coloration of off-axis sounds.
- Low RF susceptibility.
- Selectable low-frequency response: flat, 6 or 18 dB/octave rolloff.
- 0 dB/10 dB lockable attenuator switch.
- Rugged steel construction for durability. Field-usable over wide range of temperature and humidity conditions..
- Cardioid condenser instrument microphone offers a wide frequency response and low self-noise. Features include flat response curve, low noise and high output clipping level, low distortion over a range of load impedances, and low RF susceptibility..