Making a passive sub crossover is expensive due to the high mH rating needed on the inductor, and buying a active crossover isn't an option just yet, and even if it was, I'd only be using the sub out portion, so it would be a waste of money anyway. My 'receiver' doesn't have a sub out, as I'm using the Dayton amp150 (or whatever it's called) to power my speakers.
I was thinking of using

this as my sub crossover, but I was trying to think of a way to power it. Could I just use a ac-dc adapter to power it? It can't take too much power to get that subcrossover working can it?
Any other options you guys have in mind would be very helpful.
- Mike.