General Description

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).



Electret Condenser

Frequency Response

40 to 16,000  Hz

Polar Pattern


Output Impedance

EIA rated at 150  Ω (200  Ωactual


at 1kHz,open circuit voltage

phantom power -49  dBV/Pa(3.5  mV)
battery -50  dBV/Pa(3.2  mV)[1]

Maximum SPL

1 kHz at 1% THD[2]

phantom power 141 dB
battery 123 dB

Signal-To-Noise Ratio[3]

Ref. 94 dB SPL at 1 kHz

72  dB

Dynamic Range

at 1kHz

phantom power 119  dB
battery 101  dB

Clipping Level

1 kHz at 0.25% THD,1 kΩ load

phantom power 14  dB (0.63  mV)
battery 23  dB (0.71  mV)

Hum Pickup

typical, at 60 Hz, equivalent SPL/mOe

-3  dB


Positive pressure on diaphragm produces positive voltage on pin 2 with respect to pin 3


Net 0.250  kg (0.55  lbs)
Packaged 0.949  kg (2.5  lbs)


Three-pin professional audio (XLR), male, balanced


Steel and brass construction with gray finish and stainless steel mesh grille

Environmental Conditions

Operating Temperature -6.7° to 49° C (20° to 120° F)
Storage Temperature -29° to 74° C (-20° to 165° F)
Relative Humidity 0 to 95%

Power Requirements

phantom power 11 to 52  V DC (1.2  mA)
battery 1.5  VAA batteries

Battery Life

Up to 5000  hours (alkaline)

Typical Frequency Response

Typical Polar Pattern

Block Diagram

① Capacitor Cartridge

② FET Impedance Converter With Active Load

③ LF Response Filter

④ Class A Compound Amplifier

⑤ RFI Filter

⑥ Balanced Transformer

⑦ Battery

⑧ Regulator/Reverse Voltage Protector

Overall Dimensions


Furnished Accessories

Microphone Clip for SM58, SM57, SM87A, Beta 87A, Beta 87C, PGA57, PGA58, PGA48, PGA81


Carrying/Storage Bag


Optional Accessories

In-line Switchable Attenuator


Isolation Mount/Swivel Adapter for KSM109, KSM137, KSM141, SM63, SM81, SM94 and VP64


Black Foam Windscreen for PGA81, SM94 and SM137


7.6 m (25 ft.) Cable (XLR-XLR)



This product meets the Essential Requirements of all relevant European directives and is eligible for CE marking.

The CE Declaration of Conformity can be obtained from:

Authorized European representative:

Shure Europe GmbH

Headquarters Europe, Middle East & Africa

Department: EMEA Approval

Jakob-Dieffenbacher-Str. 12

75031 Eppingen, Germany

Phone: 49-7262-92 49 0

Fax: 49-7262-92 49 11 4