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In Reply to: "However, nearly all MM cartridges have bandwidths less than 25-kHz...." Again? posted by Rick W on October 22, 2014 at 12:29:39:
> So how did you conclude that "nearly all" mm's have bandwidth less than 25kHz?
It is easy to conclude from calculating the resonance frequency of the tank circuit formed by coil inductance and wiring capacitance. If you measure all those cartridges you will undoubtedly find that their high-frequency response is down below -3-dB at frequencies above 20-kHz or so. It is my experience that most MM cartridges' frequency response falls off quite rapidly above 20-kHz. The problem is that only rarely do manufacturers provide frequency plots that go beyond 20-kHz and never do they specify the decibel limits of their stated frequency response. Therefore, their stated frequency response is often meaningless.
Best regards,
John Elison
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Follow Ups
- RE: "However, nearly all MM cartridges have bandwidths less than 25-kHz...." Again? - John Elison 13:19:04 10/22/14 (23)
- RE: "However, nearly all MM cartridges have bandwidths less than 25-kHz...." Again? - flood2 18:25:01 10/22/14 (11)
- Interesting! Thanks!... - John Elison 19:13:28 10/22/14 (10)
- RE: Interesting! Thanks!... - flood2 01:25:30 10/23/14 (4)
- RE: Interesting! Thanks!... - John Elison 10:29:06 10/23/14 (3)
- Limitations of white noise.. - flood2 16:03:04 10/23/14 (2)
- RE: Limitations of white noise.. - John Elison 17:22:16 10/23/14 (1)
- RE: Limitations of white noise.. - flood2 03:59:09 10/25/14 (0)
- Martin has pretty interesting measurements in this article - Penguin 20:46:03 10/22/14 (4)
- RE: Martin has pretty interesting measurements in this article - John Elison 21:32:58 10/22/14 (3)
- I would pick up a used microphone pre - Penguin 06:32:59 10/23/14 (2)
- RE: I would pick up a used microphone pre - John Elison 08:51:55 10/23/14 (1)
- Cool beans - Penguin 09:28:56 10/23/14 (0)
- Your experience? Have you measured the FR of any of the mm's I listed? - Rick W 14:42:16 10/22/14 (4)
- RE: Your experience? Have you measured the FR of any of the mm's I listed? - John Elison 14:48:24 10/22/14 (3)
- C'mon, John. "....a number of moving magnet cartridges"? - Rick W 15:12:30 10/22/14 (2)
- RE: C'mon, John. "....a number of moving magnet cartridges"? - John Elison 15:31:49 10/22/14 (1)
- No rush. Take your time. - Rick W 21:39:31 10/22/14 (0)
- RE: "However, nearly all MM cartridges have bandwidths less than 25-kHz...." Again? - frankwm 14:15:49 10/22/14 (2)
- RE: "However, nearly all MM cartridges have bandwidths less than 25-kHz...." Again? - hahax@verizon.net 20:46:00 10/22/14 (1)
- almost all the sweeps used for the FR measurements - Penguin 20:51:11 10/22/14 (0)
- hmmm - Penguin 14:09:54 10/22/14 (2)