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Old 29th September 2017
Lives for gear

Originally Posted by emrr View Post
I have been told the following by a few experts: A ribbon with a stronger magnet type will have a lower noise floor and higher output. ... Sometimes additional magnets are added to old mics to strengthen the magnetic field.
I have a couple of old Bang & Olufsen BM5 stereo ribbon mics. These are notorious for their low sensitivity: they used small weedy magnets in the first place, and they lose field strength over time. So I had Stewart at Xaudia replace the magnets in one of them with new neodymium magnets. The sensitivity is now greatly improved but what we discovered was that if you make the magnets too powerful, they compromise the low-frequency response of the microphone. I'm not sure if this is universally true of all ribbon mics, or just this design, it would be interesting to find out.