really, why's that? Those kicker zx1500.1's are powerful amps. At 2 ohms over 1700 watts. Maybe his electrical is lacking but the amp sure isn't. That really does seem like a small box for a 15, try 3.5 cf.yea something isnt right.. that subs should pound pretty hard with a solid 1500.. although you don't have a solid 1500W