Shure SM 81 LC

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Descrizione

L’SM81, uno dei migliori microfoni cardioidi a condensatore da studio, fornisce una riproduzione sonora precisa e dettagliata, eccellente per le registrazioni in studio, ma anche robusto per il rinforzo sonoro live. • Uno standard per gli strumenti acustici compreso chitarre e piatti • Risposta a bassa frequenza piatta, con attenuazione 6dB/ottava o 18dB/ottava, selezionabile • Attenuatore di 10dB interno, selezionabile, per l’uso in situazioni di elevati livelli di SPL • Solo alimentazione phantom • Schermo antivento in dotazione • Basso rumore ed elevato livello di clipping • Risposta in frequenza: 20 – 20.000 Hz

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FEATURES

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

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
SPECIFICATIONS
Type
Condenser (electret bias)
Frequency Response
20 to 20,000 Hz
TYPICAL POLAR PATTERNS
Model Model SM81 Microphone
Specification Sheet
MODEL SM81 CONDENSER MICROPHONE Specification Sheet
2
Output Impedance
Rated at 150 ohms (85 Ω actual)
Recommended minimum load impedance: 800 Ω (May be
used with loads as low as 150 Ω 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 Ω Load . . . . . . . . . . . . . . . . . . . . . . . –4 dBV (0.63 V)
150 Ω Load . . . . . . . . . . . . . . . . . . . . . . –15 dBV (0.18 V)
Total Harmonic Distortion
Less than 0.5% (131 dB SPL at 250 Hz into 800 Ω load)
Maximum SPL (at 1,000 Hz)
800 Ω load . . . . . . . . . . . . . . . . 136 dB (attenuator at 0)
146 dB (attenuator at –10)
150 Ω 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 microphone output at 94 dB SPL
and microphone self-noise 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.
Environmental Conditions
Temperature:
Storage . – 29 to 74 C
(–20 to 165 F)
Operating . – 6.7 to 49 C
(20 to 120 F)
Humidity:
Storage . 0–95% relative humidity at room
temperature (72to 80 F, 22 to 27 C)
Case
Steel construction with vinyl metallic paint finish and stainless
steel screens

Weight Net . 230 grams (8 oz)
Packaged . 740 grams (1 lb 10 oz)
FURNISHED ACCESSORIES
Swivel Adapter . A57F
10 dB Attenuator Lock . 34A830
Carrying/Storage Case . 65A1797
Windscreen . 49A111
REPLACEMENT PARTS
Cartridge and Grille Assembly . R104
OPTIONAL ACCESSORIES
Pop-Filter Grille . A81G
Heavy-Duty Windscreen . A81WS
Tripod Microphone Stand (4.3 m [14 ft]) . S15A
Stereo Microphone Adapter . A27M
Cable (7.6m [25ft]) . C25F
Phantom Power Supply . PS1A