yep ... that is a good basic design ... I really prefer the 2x10 cabs these days ... the ones I design have a little more air inside than most 2x10 then along with the ports they have a good low end response, but still plenty of mid punch and a high end bite ...
A Ric 5 string bass into a line 6 bass pod into an ampeg b2r into 2 2x10 cabs and miked with a sm57 into a big 6000 watt pa with horns, 15's and folded horn 18's ...
haha! well, my existing Trace Elliot 1x15 combo has a very similar celestion speaker to the pair i bought .......so i just copied the dimensions and erm......bingo! The port tubes are the same size too
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I use seat of the pants engineering ... no math ... I don't copy existing cabs but I do start from existing designs and make some changes and do some trial and error testing ...