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Mods for the RSM-1

  • OktavaModOktavaMod
    Michael Joly’s “standard” mod for long-geometry Chinese ribbon mics removes mechanical filters and adds acoustical damping, resulting in improved LF and HF extension, better HF detail, and reduced mechanical resonance. The “premium” mod includes retensioning of the ribbon and a Lundahl transformer.
  • Open Plan RecordingOpen Plan Recording
    Mark Chierego’s mod features a single layer headbasket, removal of waffle plates and various acoustic filters, point to point solid core wiring, Australian made ribbons (1.8 micron 99.9% pure aluminium), matched with either a Samar Audio Design toroidal transformers or the Lundahl 2912.

BidirectionalNady RSM-1

Bidirectional Ribbon Microphone

The RSM-1 “Ribbon Studio Microphone” is a Chinese-made passive ribbon mic, based on a low-tension, 50mm x 5mm aluminum ribbon measuring 2 microns in thickness. The same basic ribbon assembly can be found in numerous other “long ribbon/short path” mics, such as Alctron’s HRM-8, aka the Apex 205; find a full explanation of the three motors designs found in Chinese ribbon mics elsewhere on this site.

The RSM-1 appears to be a rebadged Alctron HRM-7A. It is resold under various brand names (although you’ll find subtle differences in the mount, grill size and shape).

A confusing discrepancy in the mic’s SPL specification has been reproduced by numerous resellers. The HRM-7A specs state the max SPL (at 1% THD @ 1000 Hz) as 148dB, and this is echoed in the user guide of the RSM-1, but Nady’s marketing blurb gives a value of 165 dB.

The mic ships with a soft case and integrated stand mount.

The RSM-1’s retail price has not changed since its introduction; MSRP remains at about $199, with a street price of $160.

The Nady RSM-1 is also known as: RSM1.

The mic was released in 2005.


Pickup Patterns Pads & Filters
Bidirectional (2 mV/Pa; 30 - 15,000 Hz)
Ribbon Construction Impedance SPL/Noise
2'', 2-micron aluminum ribbon 600 Ohms (Low) Max SPL: 148 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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