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MODEL SM94
UNIDIRECTIONAL CONDENSER MICROPHONE
The Model SM94 is a unidirectional electret condenser
microphone tailored to the instrument miking needs of professional
musicians and sound engineers in both live performance and
sound recording. Its smooth, flat frequency response is free of
either a "presence peak" or a low-frequency rolloff, making it a
perfect choice for all types of musical instruments. The SM94 is
equally at home in sound reinforcement systems or in sound
studios and motion picture/TV scoring stages. When used with the
optional windscreen, the SM94 can be used by vocalists and
speechmakers who desire a wide, flat response with minimum
coloration.
The SM94 can be powered by any phantom power source, or by
an internal 1.5-volt AA battery. The battery, which serves as a
backup power source in the event of phantom power failure, can
provide up to 5,000 hours of continuous operation.
The SM94 is supplied with a swivel adapter for use on a
microphone stand, boom or gooseneck, and a zippered vinyl
storage bag. Model SM94-LC is supplied without a cable.
Accessories include a foam windscreen (A3WS), two-channel
phantom power supply (PS1A), and 7.6 m (25 ft.) microphone
cable (C25J).
Features
Wide, flat response for optimum musical instrument sound re-
production
Full spectrum sound–no presence peak or low-end rolloff
Cardioid polar pattern that is uniform with frequency and sym-
metrical about axis for maximum rejection of unwanted sound
and minimum of-axis coloration
Very low susceptibility to RF and electromagnetic hum
Low distortion output and wide dynamic range for variety of load
impedances
Shock–mounted cartridge for reduced handling noise
2005, Shure Incorporated
©
27C2689 (Rev. 5)
Model SM94 User Guide
Accepts 12 to 48 Vdc phantom power
Rugged all–metal construction
Usable over wide range of environmental conditions
Built–in battery power backup
Optional foam windscreen
SPECIFICATIONS
Type
Cardioid condenser (electret bias)
Frequency Response
40 to 16,000 Hz (see Figure 1)
TYPICAL FREQUENCY RESPONSE
Polar Pattern
Cardioid (unidirectional)–uniform with frequency,
symmetrical about axis (see Figure 2)
TYPICAL POLAR PATTERNS
FIGURE 1
FIGURE 2
Printed in U.S.A.

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  • Página 1 TYPICAL FREQUENCY RESPONSE The SM94 can be powered by any phantom power source, or by FIGURE 1 an internal 1.5-volt AA battery. The battery, which serves as a backup power source in the event of phantom power failure, can Polar Pattern provide up to 5,000 hours of continuous operation.
  • Página 2: Battery Operation

    CIRCUIT DESCRIPTION Operating: –6.7° to 49° C (20° to 120° F) A block diagram of the SM94 is shown in Figure 4. The capacitor cartridge is followed by an impedance converter stage. This stage Humidity: has an active load to obtain good load-driving capability with the Storage .
  • Página 3: Furnished Accessories

    TROUBLESHOOTING microphone shall have a rated output impedance of 150 Ω for Due to the circuit complexity of the SM94, only basic servicing is connection to microphone inputs of 150 Ω or higher. The open recommended. The following steps should be taken if problems circuit voltage shall be –49 dBV/Pa (3.5 mV) dB equals 1 volt per...
  • Página 4: Dimensions Figure

    Net: 250 grammes Sous charge de 800 Ω: –18 dBV (0,13 V) (fantôme, 3% de distorsion harmonique); –21 dBV (89 mV) (pile, 3% de Emballé: SM94-LC: 957 grammes distorsion harmonique) Homologation Niveau de pression acoustique maximum (à 1 000 Hz) Autorisé...
  • Página 5 12 à 48 Volts continus. Type De plus, le SM94 peut être alimenté par une pile alcaline de 1,5 Kondensator-Mikrofon auf Electret-Basis volt (IEC type LR6). La pile sert aussi d'alimentation de secours en Frequenzbereich cas de panne de I'alimentation fantôme.
  • Página 6 Spannungsquelle zwischer 12 und 48 Volt (z.B. dem Shure Modell Überspannung und Umkehrpolaritätsschutz PS1A). Außerdem kann das SM94 durch eine einzige 1,5 V Max. Externe Spannung an Stift 2 & 3 gegen Stift 1: + 52 Alkalibatterie gespeist werden (Typ IEC, LR6). Die Batterie dient Umkehrpolaritätsschutz bis zu 100 V DC...
  • Página 7 Tensión abierta del circuito: –49 dBV/Pa (3,5 mV) Neto: 250 gramos Nivel de corte (a 1,000 Hz) Embalado: SM94-LC: 949.7 gramos Carga de 800 Ω: –18 dBV (0,13V) (fantasma, 3% de Certificaiones distorsión armónica); –21 dBV (89 mV) (pila, 3% de Califica para llevar las marcas CE.
  • Página 8: Operacion

    FUENTE DE ALIMENTACION PS1A Conecte el cable del micrófono al SM94 y a la fuente de alimentación en el conector del micrófono. La fuente usa el cable balanceado para transportar la corriente de alimentación al micrófono y la pantalla del cable como retorno de masa.

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