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BidirectionalApex Electronics 205

Bidirectional Ribbon Microphone

The Apex 205 is the best-known retail version of Alctron’s HRM-8B, a large-format ribbon design that has, according to Oktavamod’s Michael Joly, “obvious internal resemblance to the AEA R84.” The same ribbon motor design can be found in the Nady RSM-2 and the Shinybox 46 (the latter being remarkable in that it has all the mods you’d want to do built in from the vendor).

Common mods for these mics include:

  • Re-tensioning sagging ribbons
  • Removing blast filters from behind grille
  • Swapping the stock transformer for a Cinemag (e.g. CM-9888) or Lundahl (e.g. LL2911) or Edcor (e.g. RMX1)

For sound samples of a shootout between the AEA R92, Coles 4038, and a pair of OktavaMod-modded Apex 205s, see drBill’s ribbon mic shootout on solo piano.

The Apex Electronics 205 is also known as: Apex205.


Frequency Response - BidirectionalClick Graph to Compare!
205 Bidirectional Frequency Response Chart
Pickup Patterns Pads & Filters
Bidirectional (2 mV/Pa; 30 - 18,000 Hz)
Ribbon Construction Impedance SPL/Noise
50x5mm, 2-micron aluminum ribbon 600 Ohms (Low) Max SPL: 165 dB
Weight Length Max Diameter Interface(s)
524g (18.48oz) 170mm (6.69'') 55mm (2.17'')
  • 3-pin XLR male (1)
Power Specifications

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