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Afaik there are different 18" models in different Vertec-subs. Since most of them seem to be high powered drivers, as opposed to the Kappa Pro's, I expect them to have lower power compression and higher power handling, so two reasons to expect them to go quite a bit louder than the Kappa's.
I built 5 cubo 15 a couple of years ago and put eminence cappa pros and they sound pretty good especially inside. I can get 4 JBL 18" neo speakers that came out of vertec boxes for $100 each. I was thinking of building 4 cubo 18 to go along with the 15. I can run them on different Crown XTi amps and cross them a little different if I need to. My question is will 4 of the 18 give me the thump I am looking for live music outside or do I need to look at a horn loaded W cab
Personally I don't correlate negative or positve wiring to different amounts of delay. Positve or negative wiring can end up, better in phase with your tops (and that is dependant on your tops, not your bass cabinets).
Finnaly i made a few cubo18s ex, with a strange STX driver stx.pl/sw-stx-18-4-1300-8-f-s-mc.html.
Im quite happy because performance is very good, and value ratio is excelent (driver for 100E). Now I have ask. If I play magnet inside horn and positive wireing how much i need delayed BR to make a phase correct. And if I play in the same way but in negative wire I need delay?