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high-pass rumble filter

Posted: Mon Nov 21, 2022 3:39 pm
by les winter
My new THTLP is done. Frequency sweeps seem to show it unloads below 25 hz. Is a high pass filter recommended?
thanks.
Les

Re: high-pass rumble filter

Posted: Tue Nov 22, 2022 11:06 am
by Radian
It rolls off, but the driver never “unloads”. Unless the cab has a leak in the throat or rear chamber. High pass not required and/or recommended.

Re: high-pass rumble filter

Posted: Tue Nov 22, 2022 12:57 pm
by les winter
Thanks for the reply Radian.

Re: high-pass rumble filter

Posted: Wed Nov 23, 2022 10:46 am
by Bill Fitzmaurice
Radian wrote: Tue Nov 22, 2022 11:06 am It rolls off, but the driver never “unloads”.
+1. Bass reflex speakers unload below the tuning frequency, where the port output and cone output cancel each other. Sealed rear chamber speakers don't. The THT has a sealed rear chamber.

Re: high-pass rumble filter

Posted: Thu Nov 24, 2022 7:11 am
by les winter
Thanks Bill