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Re: home grown crossovers...
40rms is only about 3 amps with 4ohm components, you'd be able to use just about any inductor out there without a problem. If you get small ones though just be aware that you might have problems if you move to 100+rms per side.
This is the best walkthrough I've found for butterworth filters
http://www.apicsllc.com/apics/Misc/filter2.html
For others, you can run a google search and I'm sure you'll come up with something pretty fast.
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'01 Black Sentra SE
Weapon-R intake, HS header, HKS catback, ES motor mounts, B&M short shifter, Tein coilovers
Alpine 9835, Adire Koda 6.1, Adire Brahma 15, Arc 2100cxl, Linear Power 2.2hv, Cadence ZRS-8
'05 Silver WRX STi
Injen SES Downpipe, HKS Carbon-Ti catback, Cobb Stage 2 Tune, TiC Super Shifter, TiC Klunk Killer, Tein springs, Nitto NT555R Drag Radials
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