Audio Hi-Pass / Low-Pass Filter

Can one of you electronics guru's send me a circuit or to a link so that I can build an in-expensive hi-low audio cross-over ?

I want to plug into either the "line out" jack or "spkr out" jack of my computer's sound card ( good for about 1 watt ) and enter into this cross over at the "line level" then Bi-Amp it into the "big boy" amplifiers.

I don't need sophistication, but I think I'd like it better than just an RLC filter.

By-the-way, I do have the cross-over out of a blown sub-woofer ( has both channels ). It has (2) hefty choke coils and (4) 125uf capacitors. But I was thinking that the line level might not produce enough audio current ( driving the input of a power amp), to allow the chokes to function.

Regardless, if someone has a circuit with readily available components I can mount on a breadboard, I'd really like that