I would like to build an active filter for my vented subwoofer. Would Rod Elliot project 71 be suitable for this purpose ? http://sound.westhost.com/project71.htm
There are many circuits shown on the page. Is figure 4 the circuit i should be building ? I dunno if it is complete or if some stuff is missing.
There are many circuits shown on the page. Is figure 4 the circuit i should be building ? I dunno if it is complete or if some stuff is missing.
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.
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.
Buzzy said:Btw is it ok to supply opamp with just +12 and -12V dc instead of the +15 -15V ?
If you're using TL072 op amps that will be perfectly fine.
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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