Thank you for selecting the KSM series from Shure.
Over 90 years of audio experience has contributed to making this one of the finest microphones available.
If you have any questions not answered in this guide, please contact Shure Applications Engineering at 847-600-8440, Monday through Friday, from 8:00 am to 4:30 pm, CST. In Europe, call 49-7262-92490. In Asia, call 852-2893-4290. Our web address is www.shure.com.
The KSM137 is a premium, end-address, condenser microphone with a cardioid polar pattern engineered for highly critical studio recording and live sound productions. Its class A, discrete, transformerless preamplifier provides extremely transparent sound capture, and a three position switchable pad and low-cut filter allows for handling of extremely high sound pressure levels (SPL) and controlled bass response. Versatile, durable, and precise, the KSM137 is an outstanding microphone for both live and studio applications.
This microphone can be purchased as a stereo pair (KSM137/SL STEREO). In addition to the standard accessories, the stereo pair includes a stereo stand adapter (A27M) for mounting two microphones on one stand.
Note: Sound quality is strongly affected by microphone location and room acoustics. To achieve the best overall sound for a particular application, it may be necessary to experiment with microphone placement and room treatments.
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.
Use the supplied microphone mount with floor or boom stands. Visit www.shure.com for more mounting options:
A three-position switch on the back of the microphone lets you adjust the low-frequency response. Use the low-frequency filter to reduce wind noise, room noise, or proximity effect.
The attenuation switch lets you reduce the signal level without altering the frequency response. This can prevent extremely loud sounds from overloading the microphone circuitry.
0 dB For "quiet" to "normal" sound levels.
−15 dB For use with extremely loud sound sources such as drums, horns, or loud guitar cabinets.
−25 dB For use with in close proximity (less than 10 cm) to extremely loud sound sources such as drums, horns, or loud guitar cabinets.
Maximum SPL capability, output clipping level, and dynamic range vary with the input load impedance of the preamplifier to which you connect the microphone. Shure recommends a minimum input load impedance of 1000 Ω. Most modern microphone preamplifiers meet this requirement. Higher impedance results in better performance for these specifications.
Stereo microphone techniques give depth and spatial placement to sound sources for broadcasting, recording, or sound reinforcement applications. The Shure A27M allows you to mount two microphones on a single stand with a wide range of angles and vertical separations for a variety of coincident and closely-spaced stereo configurations.
The following table displays the most common stereo techniques. Keep in mind that microphone technique is largely a matter of personal taste; there is no one “correct” microphone position. For more information, search “Stereo Techniques” at www.shure.com (www.shure.com/stereo-tech).
20 to 20,000 Hz
open circuit voltage, @ 1 kHz, typical
–37 dBV/Pa (14.1 mV)
1 kHz at 1% THD
|PAD ON||5000 Ω load||170 dB|
|2500 Ω load||164 dB|
|1000 Ω load||159 dB|
|PAD OFF||5000 Ω load||145 dB|
|2500 Ω load||139 dB|
|1000 Ω load||134 dB|
@ 1 kHz
|5000 Ω load||131 dB|
|2500 Ω load||125 dB|
|1000 Ω load||120 dB|
20 Hz to 20 kHz, 1% THD
|5000 Ω load||15 dBV|
|2500 Ω load||9 dBV|
|1000 Ω load||3 dBV|
equivalent SPL, A-weighted, typical
14 dB SPL-A
10 to 100,000 kHz
0, -15, -25 dB
Flat, –6 dB/octave below 115 Hz, or –18 dB/octave below 80 Hz
Three-pin professional audio (XLR), male, balanced
Positive pressure on diaphragm produces positive voltage on pin 2 with respect to pin 3
11–52 V DC phantom power (IEC-61938) 4.7 mA, maximum
100 g (3.5 oz.)
 1 Pa=94 dB SPL
THD of microphone preamplifier when applied input signal level is equivalent to cartridge output at specified SPL
S/N ratio is the difference between 94 dB SPL and equivalent SPL of self noise, A-weighted
All specifications measured with a 48 Vdc phantom power supply. The microphone operates at lower voltages, but with slightly decreased headroom and sensitivity.
Note: KSM137/SL stereo only.
Carrying Case for two KSM137 or KSM141 microphones and A27M stereo bar
Foam Windscreen for KSM141 and KSM137
Microphone Clip for AMS26, Beta 181, KSM137, KSM141, MX412, MX418, MX412S, MX418S, MX412SE, MX418SE, SM62, SM63, SM63L, SM63LB, SM81, VP64, VP64A, VP64AL and standard microphone stands
Stereo Microphone Adapter
Isolation Mount/Swivel Adapter for KSM109, KSM137, KSM141, SM63, SM81, SM94 and VP64
|Popper Stopper® Pop Filter with Metal Gooseneck and Microphone Stand Clamp||
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: www.shure.com/europe/compliance
Authorized European representative:
Shure Europe GmbH
Headquarters Europe, Middle East & Africa
Department: EMEA Approval
75031 Eppingen, Germany
Phone: 49-7262-92 49 0
Fax: 49-7262-92 49 11 4
Trademark Notices: The circular S logo, the stylized Shure logo, the word “Shure,” and “ShureLock” are registered trademarks of Shure Incorporated in the United States. “Popper Stopper” is a trademark of Shure Incorporated in the United States. “Mylar” is a registered trademark of E.I. DuPont de Nemours and Company in the United States. These marks may be registered in other jurisdictions.
Patent Notice: Patent Des. 479, 837