I have an SWR Bigfoot 2x12 that now has been replaced with peavey Black Widows. I hate them. I was thinking about getting some Carvin's to replace them. Now heres my question. The specs of the Carvin lists 38hz as the low freq. reponse. But my Bigfoot is tuned to go 30Hz, I believe. If I put those Carvins in do I get my cabs 30Hz or the speakers 38Hz as a low end number?