what amp are you running.... the lower you drop your ohms the harder it will hit, but never drop below your amps rating or youll overheat it. so id run it as a mono 2 ohm since most amps can handle a 2 ohm load. heres a link to help you wire it up
http://www.rockfordfosgate.com/products/product_details.asp?item_id=108289&locale=en_us
but if you your amp can drop to 1 ohm id get 2 subs and pet em pound
http://www.rockfordfosgate.com/products/product_details.asp?item_id=108289&locale=en_us
but if you your amp can drop to 1 ohm id get 2 subs and pet em pound