if you were building a wo enclosure for home audio using your reciever for amplification would you need to use any type of crossover or coil to cut off higher frequencies to the woofers? this assuming you are using an average car audio woofer (rf, jl, infinity).
thanks

does anyone know where i could get a crossover or coil? what would anyone recomend to cut the freq at for home audio. i would guess around 100hz. any thoughts??

Your Reciever might have a sub out- most nowadays do.  Or at least mine does.

The next thing then is to look at your amp for the sub.  Usually they have a low pass and rumble filter.

If neither have anything useful- you can active or passive.

Active requires purchasing a home EQ or XO (or my personal favorite- a car audio XO ran off a 120vac to 12vdc transformer)

Passive requires a very large expensive coil. Or coils and capacitors depending on slope.

I would recomend 80-120hz XO point, based on how low you mains will go.  The lower the better for a sub.  The higher the frequency, the sharper the cut you are gonna wanna make also.  Best in my opinion would probably be 12dB/octave at 80hz.

i found the sweet cross point to be3 about 86hx but that was with a box modded for 12's and using Pa drivers (beyma lx60 - www.beyma.com) was also high passsing the main speakers, sounded great.

i was using a digital crossover the behringer dcx2496, not that pricey...