I wouldn't exactly say that ev mid/high speakers blow the JBL's out the water, but they're definately excellent, and 1 of the top speaker manufacturers in the world, although there's getting to be so many these days, but my favourites are rcf, ev, eaw, turbosound, nexo, jbl, martin audio, db technologies, d&b audiotechnik and few others. I would say funktion one, but to be honest I like them but dont love them.
Anyway, back onto what we were talking about, yeah, you think 2 ev tx1152 would definately keep up with the mighty srx728? Thats a bold statement, especially seeing as their spec says that they're tested in half space and the jbl 728 sub is tested in full space. I would think it might take 4 ev tz1152 to keep up with my pair of srx728 subs. I wish I could hire a pair out from somewhere but I live in the uk, and there's hardly anything to hire out here other than nexo, L acoustics and a couple other brands really that i know of, and there's definately nothing within 100 miles from me that hire out anything than budget brands like skytec, rcl, american audio, wharfedale etc...