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Old 16th April 2012, 01:34 PM   #1
diyAudio Member
Join Date: Apr 2012
Default help building a crossover/lowpass filter

hey, i am working towards building a passive subwoofer lowpass filter
first of all should i do the rl or rc one, i mean like the cap and resistor or the cap and inductor, which would be the be the most reliable/better to run with minimal power loss,
i am planning to have it as 12db/octave and cutoff at 100hz, can comeone please work the equation out for me cause i am stuck in a rut and cant think at all. also, how will it be wired up, im quite new to this sort of stuff,

Thanks, Dale

and also sorry if i post this in the wrong section just tell me and ill move/delete it as i just signed up to this after always looking through the forums for information,
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Old 16th April 2012, 09:42 PM   #2
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Join Date: Nov 2008
Dale: You will need all 3: R, L +C. But, before you start, you need the speaker parameters, starting with its nominal impedance and the Thiele-Small parameters. After that it gets complicated.
Often it is easier to go with an active sub. E
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Old 16th April 2012, 11:00 PM   #3
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Join Date: Apr 2012
hey mate, sorry i forgot the impedance, the speaker takes 4 ohms, and please explain all that other crap
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