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Is it possible to get a BFD and add a filter to use it as a low pass at 150hz without using a mic to test for SP?
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Yep, but it takes more than one filter depending on how perfect you want it and at what slope.
Why 150Hz? and not 80Hz..............
If you need help with the filters required, I can create them for you, but it's not too difficult to do yourself..
brucek