Bigger isnt always better-- 4 ,C-10 Kicker subs in a single chamber behind a 78 single cab truck with a Mean Machine 44 HC pushing all four shook some ground approx 40-50 ft away..140 amp stock alt with two agm batts,Big 3,with a Sony HU,Kicker KQ9 preamp EQ 2 sets of kicker KS 5.25s in the doors and one set of KS-25 tweets,on one 4 ch JBL GTQ 400.One Loud azz old truck.Anyone that lived in ENNIS a few years back should know that old brown Chevy truck my cousin had back then.Another Cheap Azzed sub that just Banged well..and Tens/cheap tens