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BidirectionalMXL R77

Bidirectional Ribbon Microphone

The R77 is a ribbon microphone with a traditional yoke-mount form factor.

We believe it to be a “medium length” ribbon design, much like the Fathead style ribbons. (See the sidebar link to Michael Joly’s analysis of common ribbon-mic motor designs.) The ribbon material in the MXL R77 is 1.8-micron aluminum.

The R77 comes with a Chinese transformer and therefore with many 3rd-party mod options — swapping the stock transformer in imported ribbon mics is usually an inexpensive but effective upgrade. Due to the popularity of aftermarket mods, MXL is now offering the R77L, in which the R77’s stock transformer is replaced with a Lundahl unit. This is described as a limited-edition option.

The mic ships with a padded wooden storage case, a weighted desktop mic stand, a micro-fiber polishing cloth, and a 25' Mogami XLR cable.

The MXL R77 is also known as: R-77, R77L.

The mic was released in 2009.


Frequency Response - BidirectionalClick Graph to Compare!
R77 Bidirectional Frequency Response Chart
Pickup Patterns Pads & Filters
Bidirectional (1.7 mV/Pa; 20 - 18,000 Hz)
Ribbon Construction Impedance SPL/Noise
1.8 micron aluminum ribbon 270 Ohms (Low) Max SPL: 135 dB
Weight Length Max Diameter Interface(s)
860g (30.34oz) 180mm (7.09'') 65mm (2.56'')
  • 3-pin XLR male (1)
Power Specifications

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