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Specifications and Reviews
Mods for the HRM-7
- OktavaMod
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. - Marik
Marik offers repair and modification services for all types of ribbon mics, vintage and modern. Ribbons can be retensioned or replaced. Magnets can be upgraded. Transformers can be replaced with Marik's custom low-noise toriodal design.
Related Microphones
Ningbo Alctron Electronics Co., Ltd. HRM-7
Bidirectional Ribbon Microphone
Description
The HRM-7A and HRM-7B are inexpensive “large geometry” ribbon mics made in China; they are sold by Alctron and possibly made by ShuaiYin. Both utilize 50mm, low-tension, 2-micron aluminum ribbons.
The HRM-7A and HRM-7B have identical specs, according to Alctron; the two models differ only in the style of the mount. The 7B has a rotating yoke mount; the 7A has a simpler mount that attaches to the base of the microphone.
Further, the HRM7 mics (7A and 7B) differ from the HRM8 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-7 is also known as: HRM-7B, HRM7A, HRM-7, HRM-7A.
The mic was released in 2005.
| Pickup Patterns | Pads & Filters |
|---|---|
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| Ribbon Construction | Impedance | Max SPL |
|---|---|---|
| 50mm x 5mm, 2-micron aluminum ribbon | 600 Ohms (Low (50-1000 Ohms)) | 148 dB |
| Weight | Length | Max Diameter | Interface(s) |
|---|---|---|---|
| n/a | 170mm (6.69'') | 55mm (2.17'') |
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| Power Specifications |
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