Your first response from "mattmiller" is a good one. First off I have several REL subs and they all have no peer in their price / performance category. Actually a pair of the entry level subs will do an amazing job when carefully set up. "Speaker level" connections are always the best way to go. Virtually all audio critics will agree to that. The REL's come with a cable that has a "speakon" connector to plug into the sub. The amplifier end can be connected parallel with the sattelite speakers. One sub parallel with each channel. The REL manual will provide info on the correct connectivity. There are also after market cables designed and terminated with quality connectors, that would be a slight upgrade from the ones supplied by REL. Also the supplied cables are quite long to accommodate almost any possible setup. Once you have determined the ideal locations for the subs, you should be able to buy the aftermarket version cut to a more appropriate length, unless you prefer to do it yourself. That's my recommendation !
"SPEAKER LEVEL CONNECTIONS"