Where can i get 4 ohm crossovers?

Can anyone tell me where i can get 4 ohm crossovers

I would expect that the best way would be to build your own, but here are the ones I used. http://www.partsexpress.com/pe/showd...number=260-150

At 4 ohms instead of 8 the crossover points would be higher than those specified. I don't remember by what factor they change.

Here's a place to get components. http://www.partsexpress.com/crossovers.cfm
You'll see a few guides at the bottom of this link. I would bet that somewhere in there is info on how different resistances will affect the crossover points.