My local 'list has some db Arena 18's for a good price of $275. Does anybody have any experience with these? I tried searching, but it's hard to get good results with such a short search subject. They're passive, but have an internal crossover, which I think is a plus. Also on the specs page, it says, "Frequency Response [+/- 3dB] 35 - 150 Hz", can anybody tell me what that means in lehman's? I'm also curious what the logistics are behind combining powered mains (older JBL Eon 15s) with passive subs like these. I don't imagine there should be any problems, but I want to confirm it with you guys before I do anything I shouldn't. And lastly, considering they're 600W rms and 1200W peak, what's the power amp wattage range I should look at? Thanks!