i actually have 1 10" polk audio sub (http://www.polkaudio.com/caraudio/products/mm2104dvc/) hooked up to the c300.2 (http://www.polkaudio.com/caraudio/products/c300_2/). thought id be pretty satisfied with the output especially for the good price i got them for, but eh... thinking about switchin over to a JL w6v2.