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Old 27th April 2005, 06:50 AM   #11
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Choosing a Bessel (Thomson) lowpass response for the amp is equally valid, and allows for a much reduced bandwidth.
I agree on that. Unfortunately there are a lot of other unknown lowpass poles in a chain usually. This is a thing that could be optimised in the (reproduction part of it at least) chain without much cost and just some work effort, i.e. including preamp and tweeter response as well in order to achieve an overall Bessel response.

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Charles
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Old 27th April 2005, 07:57 AM   #12
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Originally posted by phase_accurate
I agree on that. Unfortunately there are a lot of other unknown lowpass poles in a chain usually. This is a thing that could be optimised in the (reproduction part of it at least) chain without much cost and just some work effort, i.e. including preamp and tweeter response as well in order to achieve an overall Bessel response.

Yup it's like the discussion about decimation/interpolation filters in recording/reproduction. In 96k/192k systems people are advocating the use of slow-rolloff filters (the correct kind should roll off between 20kHz and fs/2, not 20kHz and fs-20kHz like some idiots are doing it) to remove pre/post ringing. So far so good. Unfortunately if you cascade a bunch of these you get a sharp rollof filter starting at 20kHz, ringing and all. Obviously (?) the answer is to use standard sharp rolloff filters (ideally brick wall at fs/2) everywhere in the chain and only one slow-rolloff filter at one point in the chain (my suggestion: at mastering).
Try to explain about compound response of a signal chain to some people...
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Old 29th April 2005, 11:17 PM   #13
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