How does Ampeg get such a wide frequency response out of their SVT 410 HLF? They say the range is 48-18 khz, with a "useable low" end of 28 khz. On their SVT 15E the range is 51-3 khz, with a "useable low" of 33 khz. How do they get a lower response out of 10's, just the building of the cab? And what is the "useable low" number all about???? Why don't they just use the "useable low" number in the listed range rather than listing it seperately? My Trace Elliott 1048H cab says the response is 45-7 khz. It has a horn, so why is the high end so much lower than the Ampeg SVT 410 HLF? Okay, last question...If the Ampeg SVT 410 HLF does everything so well, am I better off getting rid of my TE 1048H and the Ampeg SVT 15E and replacing it with one Ampeg SVT 410 HLF?