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Cliff Mics RM1

Pricing & Availability

  • MSRP: $2,699


Reviews & News

BidirectionalCliff Mics RM1

Bidirectional Active Ribbon Microphone

The RM1 is an active ribbon microphone designed to capture the qualities of the RCA 44 while improving on its performance. Its topology is that of a passive ribbon plus onboard amplifier.

The ribbon motor is unique for its use of oversized rare-earth magnets. The two Neodymium magnets measure 1x1x2 inches; each can apply in excess of 130 lbs of pull force. The design of the Cliff motor directs this considerable amount of energy toward the ribbon element. According to Cliff, the high flux intensity gives the RM1 a 6dB higher output signal at the ribbon than other designs.

The ribbon measures approximately 51mm x 4mm, and is made of 1.8-micron thick aluminum.

The source and ratio of the output transformer have not been released.

The output transformer feeds an active gain stage designed by LR Baggs, a manufacturer of acoustic pickups. The circuit increases the signal level, and performs frequency-specific filtering to tailor the mic’s sound. The stated sensitivity is 12.5 mV/Pa, which is comparable to a condenser microphone.

The mic has an integral 24-inch cable, made from Gotham GAC3, with a Neutrik XLR3M adapter at the end.

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The mic was released in 2014.


Pickup Patterns Pads & Filters
Bidirectional (12.5 mV/Pa; n/a)
Ribbon Construction Impedance SPL/Noise
Length: 50mm
Width: 4mm
Gauge: 1.8 microns
Weight Length Max Diameter Interface(s)
3400g (119.93oz) n/a n/a
  • 3-pin XLR male (1)
Power Specifications
  • Requires phantom power
  • Phantom voltage: 48v

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