The BM9 from Extinct Audio is a general purpose bi-directional ribbon microphone, with a symmetric figure-8 pickup pattern. It is designed to be equally at home in front of a guitar amp, above an orchestra, and everywhere in between. It has a deep, rich bottom end particularly when used close to the source, and has a large bass proximity effect. At the top, the response is smooth and detailed, as one expect to would find in a high end vintage ribbon microphone.

Aesthetically, the BM9 is inspired by classic Danish microphones from the 1950s and 60s, but contains numerous technical innovations which bring its performance, noise floor and output level ‘bang’ up to date.

Deep-field magnets

The Viking utilises a wide, long ribbon in a strong magnetic field to give a strong output with low noise floor. The deep-field magnets ensure linear performance as the ribbon moves from front to rear. Vertical grill slots of different size reduce diffraction and improve rejection from the sides of the microphone. All this adds up to a deep, rich tone with an amazing degree of clarity from a ribbon microphone.

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The Sonic Temple

Every Extinct Audio ribbon is sonically tempered for durability and extended life. This involves subjecting the microphone to audio frequency vibrations, which harden and strengthen the aluminium ribbon. The custom-wound permalloy core transformers are designed and made at our workshop to ensure high efficiency and low noise over the full sonic range.

Listen to the BM9

Built in Yorkshire

All the mechanical parts are machined in the UK, and the microphones are assembled here in our workshop in York. Each ribbon is hand-fitted and tuned by Stewart, who has over a decade of experience repairing and building thousands of ribbon microphones.

Further details

Technical specs

  • 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)

Custom options

Other impedances available on request at no extra charge. Because we make the transformers and assemble the microphones in-house, it is a simple task for us to modify the microphones to your requirements.


Ribbons are warrantied for one year – with careful use they should last much longer. All other parts come with a lifetime warranty to the original owner.

Built for the future

Good quality studio microphones have very long lives and may be in use for several decades if cared for and serviced occasionally. We have seen ribbon microphones come in for service that were made in 1927, and sincerely hope that our microphones will outlive their owners!

We use recyclable or sustainable materials where possible. 99% of the microphone is made of metals – brass, steel and aluminium, all of which can be recycled. Plastic parts make up just 1% of the microphone’s weight. The microphone boxes are made from sustainable ash wood..

We re-use cardboard boxes and other packing materials where possible for shipping the microphones.

In good company...

Try the BM9

We have a full 30 day no-quibble returns policy so you can order and try the microphones safe in the knowledge that you can get a full refund if they don’t work out.

For Germany please contact Matthias H. Franz Hahn

For Norway please contact Studiolyd

For Switzerland please contact Crazy Rabbit Pro Audio