Hi, I'm considering getting a pair of good nearfields. (BM6a, AIR 6, Mackie...) But at the same time I see used JBL 4430s going for about the same money. I have a rather big listening room, (84m3, or a stiff 3000 cubic feet) but I really can't drag these 80 kilo monsters in there to try them out, so I'm not sure where to spend my money. Any thougts lads? Are those monsters only good for impressing clients, or are they great for mixing as well?