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The RCA Types KB-2A, B, and C
“Bantam” velocity microphones


Hear the sound of the Type KB-2B voiced by Dennis Schrank.

The “Bantam” Velocity mics, Types KB-2A, KB-2B, and KB-2C are miniature Velocity Microphones whose prin­ciple of operation is no different from that of the 44-BX. The small size (without sacrifice in output level) is obtained through the use of highly efficient magnetic materials which are placed in the most advantageous places. The ribbon and pole piece assembly is contained in the upper screened portion, and the transformer and compensating reactor in the housing immediately below. Output impedances of 30/150/250 ohms are provided. The screened portion is pivoted and may be tilted forward or backward through an angle of approximately 30 degrees. On one side below the pivot is a screwdriver-type switch for selecting the bass response for voice or music. The cable can be disconnected by opening the back portion of the shank and disengaging the concealed plug. An “XL” type male insert is supplied as a part of the microphone. For desk positions, the KS-5A low-height stand is recommended for use with the KB-2. Any standard floor stand or collapsible stand may be used for other applications.



  • Miniature size—ideal for concealment.

  • Cable disconnect at microphone makes handling easy.

  • Excellent response over the essential audio range.

  • Directional pattern allows orientation to reduce pickup of unwanted reflections.

  • Shock mounted.

  • Insensitive to stray magnetic fields.

  • Low cost.

  • Adjustable low frequency response.

  • Voice or music pickup.


An RCA Type KB-2A above, and a Type KB-2B below.


The KB-2 series is used in AM and FM broadcast stu­dios, remotes, and in television programs where it is es­sential that the artist’s face must be in full view. The mic is small enough to permit complete conc­ealment if de­sired. In addition, the KB-2 will give excellent service in any of the applications suggested for the 44-BX Velocity Microphone with no sacrifice in output level and an im­perceptible change in quality. Cognizance must, how­ever, be taken of the fact that the windscreening in the KB-2 is not as effective as on the 44-BX. It is, therefore, best not to attempt to work as close to the KB-2 if excitation due to breath puffs are to be avoided.


Photographs courtesy of Dennis Schrank
Text and illustration courtesy of RCA

Specifications Polar Tech notes

Download the technical data for the KB-2A -2B.

Tech notes

Download the technical data for the KB-2C.

This mic’s unofficial nickname is “the paint brush.”

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