Produced from 1932 - 1955, the RCA 44-BX is perhaps the single most recognizable ribbon microphone and something of an icon in the world of broadcast and recording history.

The 44-BX is a high-fidelity bi-directional ribbon microphone designed for music recording and broadcast. It uses a 2" long corrugated aluminum ribbon which is just 1.8 microns thick, roughly 1/20th the thickness of a human hair.

The frequency response from a 3 foot distance is quite flat from 50Hz - 15kHz, followed by a steep high frequency rolloff. The bass boost from proximity effect becomes quite apparent at closer distances, and so jumpers are provided inside the microphone to allow for two high-pass filter positions (V1, V2 -- "V" for "Voice" which is typically picked up from closer distances).

The only major difference between models 44-BX and 44-B is how the output cable comes out of the microphone's housing. Some examples of 44-BX have the ribbon assembly placed further back in the head basket, but this is thought to be due to inconsistencies in manufacturing and not necessarily a change in design.

Product Specs

  • 44-BX Ribbon Microphone
  • Umber Gray
  • 1940s
Made In
  • United States

From the Price Guide

Reviews for the RCA 44-BX Ribbon Microphone
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  • King of All Ribbon Mics

    This was Les Paul's favorite multi purpose mic for a reason. Sounds great on any source. You will need a preamp with lots of clean gain to experience this mic at it's full potential. Still a very relevant mic 80+ years after it's introduction.

  • Verified Purchase

    Hi-fi RCA ribbon greatness. Perfect vocal mic... instant record. A new ribbon will make it really sing.

  • RCA 44BX for ever

    Verified Purchase

    Great sounding mic on vocals, drums. It's a bit darker than Coles but it has a great bottom end. Obligatory position in the locker mic in every studio with ambitions ;)