thanks for replying byron. the 10W1v2 will handle 250 no problem according to the chart at the bottom of the link, worst case, i'd turn the gain down a bit on that channel.
http://mobile.jlaudio.com/products_subs.php?series_id=15 the soundstream manual says that it puts out 120W at 4-ohms bridged, and that's what i'm running now. it just doesn't hit hard enough for me. that's why i'm wanting to use one side of the infinity for the sub. keep in mind hearing tunes while riding isn't a big priority to me, but having good clean tunes in and around the boat is. i just want the best setup and i want to be able to fade the towers and possibly fade the tweeters in case they are too bright. hopefully this guy tomorrow knows what he's doing. supposedly he's been there for 11 years. so i'm hoping he's cool and has some patience for me. ;)
i guess i'll find out soon enough. thanks again for taking the time to reply. much appreciated.