Hey Guys,

I have an ONKYO TX-DS575X receiver and this 8" passive sub from a car, shown here http://goo.gl/8xbCt . The sub has a 4 ohm impedence, and the mininum (recommended) for my receiver is 6, or I'd just plug it into a front channel. The receiver has a subwoofer pre-out, so I guess my question is what would be the cheapest amplifier (plate amp? idk) that would be compatible with my sub, and specifically how it would be wired.

Thanks much in advance!

Link to receiver specs: Onkyo TX DS575X Specs (AV receiver - 5.1 channel) - AV receivers - CNET Reviews

(specs state that there is a 4/8 ohm switch, but I've yet to find it in any physical or digital settings, or any mention of it in the manual)