Active filter for subwoofer

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What do you want the filter to do? The circuit you linked to is typically used to extend bass response below resonance in a sealed box - it would be useful, for example, if you chose to seal the port on your current sub and then wanted to reclaim bass extension.

I don't think that's what you're trying to do. Perhaps you were looking for a rumble filter? http://sound.westhost.com/project99.htm

Or maybe you're after an active crossover? http://sound.westhost.com/project09.htm

Or perhaps you were after a graphic subwoofer equaliser? http://sound.westhost.com/project84.htm

Please elaborate on what you're trying to achieve.
 
AndrewT said:
look up sixth order alignment.
It adds a little bit of equalisation and a 12dB/octave high pass filter to a vented enclosure.
However the enclosure/driver needs to be designed in conjunction with the filter.

Thanks for all the replies. AndrewT I don't need any equalisation in the active filter as i have a separate EQ. All i want is just to cut off freq below 16Hz so that i do not go over the excursion limit. Should i be looking at project 9 or project 99 on Rod Elliot's page ?
 
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