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My 4" Dell computer subwoofer in a ported box I built in about 30 minutes running(it produces much more output than the dell enclosure) off an Alpine MRP-M350 at 4ohms(Gain and bass EQ at half and it still didnt blow!!)...Round port tuned to 43hz. This sub is one volume away from bottoming out so this is max excursion for this thing. About a half inch or so.
