TAKES MORE 12'S AND 10'S TO ACHIEVE SAME RESULT...LOUDEST I HEARD PERSONALLY WAS CHRIS NORRIS'S VAN WITH THE 15" SHOCKERS THAT WAS 172-173ISH AND WAS A WORLD CHAMPION RECORD HOLDER.Originally posted by wesleysh The LOUDEST systems I have ever seen have all used 10's and 12's, so I would have to say no. But for the novice its hard to beat 15's for spl.