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BidirectionalAEA R84A

Bidirectional Ribbon Microphone

The R84A is an active ribbon microphone, formerly called the “A840.” It is AEA’s R84 ribbon, coupled to a custom Lehle step-up transformer, plus a transformerless output circuit.

The benefits of adding active electronics to a ribbon microphone, according to AEA, are:

  • there is no risk of damaging the ribbon by applying momentary phantom power to the mic through a TRS cable.
  • active ribbon microphones have more gain and better signal-to-noise ratios, making them easier to use
  • active ribbon mics do not require a special preamp (whereas passive ribbons sound best with a preamp that provides significant amounts of very clean gain, and has high input impedance to avoid creating unwanted EQ effects

For a fuller description of the R84’s ribbon motor design and other components, see the original A840 profile (linked in the sidebar).

The R84A ships with a 3m Accusound audio cable (permanently attached to the microphone), and AEA’s “Vertical Mic Storage Case.”

Permalink: AEA R84A

The mic was released in 2018.


Pickup Patterns Pads & Filters
Bidirectional (6.3 mV/Pa; 20 - 5,000 Hz)
Ribbon Construction Impedance SPL/Noise
Length: 59.7mm
Width: 4.7mm
Gauge: 1.8 microns
92 Ohms (Low) Max SPL: 141 dB
Self-noise: 17.5 dB(A)
Weight Length Max Diameter Interface(s)
850g (29.98oz) 295mm (11.61'') 64mm (2.52'')
  • 3-pin XLR male (1)
Power Specifications

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