I need to purchase a pair of outdoor speakers for a Halloween project and found these on eBay:

http://cgi.ebay.com/PAIR-YAMAHA-CLUB...d=p4011.c0.m14

Unfortunately, I don't know what I will need to power them. I presume these don't have internal amps, so how do I go from speaker/binding posts on a conventional amp to these speakers which have 1/4" jacks? Or can I even do that?