sound quality not a big issue need to buy a hard hitting 15" or 18" sub fi-bl,hcca 15.4,re-xxx,solo-x or what just need to have a sub in my store that knocks the socks of the customers most of my customers are young city kids and have never been exsposed to any of those good quality products so hopefully this will help boost sales and thier knowledge of more than sony,jl,pioneer,rockford so many outthere choice is getting pretty hard all suggestions are welcome thanx.