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Mods for the HRM-8B

  • 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.
  • 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.

Ningbo Alctron Electronics Co., Ltd. HRM-8B

Pricing & Availability

  • MSRP: $41

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Reviews & News

HRM-8B Documentation

BidirectionalNingbo Alctron Electronics Co., Ltd. HRM-8B

Bidirectional Ribbon Microphone

The HRM-8A and HRM-8B constitute one of the main sources of the recent flood “cheap Chinese ribbon” hitting the US market. Like other Alctron mics, this specific brand is generally not available via retail, but can be purchased under a variety of names (Apex, Nady, T.bone); see the sidebar links for specifics.

We’re accumulating full details about this mic — common mods, howto articles, reviews — on the Apex 205 page, as that’s the best-known clone of the HRM-8B.

The HRM-8A and HRM-8B have identical specs, according to Alctron; the two models differ only in the style of the mount. The 8B has a rotating yoke mount, pictured here; the 8A has a simpler mount that attaches to the base of the microphone.

Further, the HRM8 mics differ from the HRM7 mics only in grille shape and color (and possibly mount style).

All the HRM-7 and HRM-8 mics are smaller than the HRM-1 and HRM-2 mics, although the ribbon element in all cases measures 50mm x 5mm. The HRM-7 and HRM-8 mics have a different transformer and magnet assembly than the HRM-1 and HRM-2.

The Ningbo Alctron Electronics Co., Ltd. HRM-8B is also known as: HRM-8A, HRM8A, HRM-8, HRM8B, RM-8B, HRM8.

Specifications

Frequency Response - BidirectionalClick Graph to Compare!
HRM-8B 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: 148 dB
Self-noise: 18.0 dB(A)
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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