Extinct Audio BM9 Studio Ribbon Microphone


 Versatile low noise studio ribbon microphone. Supplied with hard-tail mount and box.


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The BM9 is a versatile low noise ribbon microphone, with a strong output, rich bass and clear, detailed top end. It is equally at home in front of a guitar amp or an orchestra. The BM9 brings you the best combination of vintage tone and modern utility.

Quality control is paramount with ribbon microphones, which is why every ribbon is made, fitted and tuned by Dr. Stewart Tavener, who has worked on thousands of vintage and new microphones. The BM9 is made in the UK*. All the metal parts are machined and plated in England, and the transformers are wound and the mics assembled  at our facility in York.

The BM9 is supplied with a solid wood box and hardtail mount.

Mechanical parts carry a lifetime warranty to the original owner. Ribbons are warrantied for 1 year from date of purchase, but with care should last many years.

Technical specifications

  • Output impedance = 300 ohms at 1KHz
  • Directional Pattern: True figure-8. View BM9 polar pattern chart
  • Transducer Element: 1.8 micrometer aluminum ribbon
  • Frequency range*: <30 Hz – 15 kHz @ ±3dB. (excludes proximity effect)
  • View BM9 frequency response chart
  • Maximum SPL: 135dB @ 20 Hz
  • Sensitivity: 3.5 mV/Pa, -49 dBv/Pa (referenced to AEA R84)
  • Self noise (thermal): -130 dBV at 20ºC (20 kHz bandwidth)
  • Signal to noise (1kHz at 1 Pa): 81 dB.
  • Proximity effect: Strong
  • Electronics: Passive. No power required
  • Output configuration: Transformer balanced
  • Output Connector: XLR3, Pin 2= +ve, Pin 3 = -ve, Pin 1 = Ground
  • Weight: 355g (microphone only)

*We use transformer laminations and bobbins from Germany and USA. Everything else is made in England.

Additional information

Weight1 kg
Dimensions25 × 15 × 10 cm

BM9, BM9+Fenrir, BM9 Stereo Pair, BM9 Stereo Pair+ 2 Fenrir

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