Well the target is out of the box, fire!!
Seriously though, I'd go for the SRM 450. You can see those being used everywhere, and there is a reason for that. I used to have both SRM 450's, and before that EV S200's, which I have heard against since and never understood how good they really were with the Sba120 subs and XP200 controller. Well, I wanted to slim down to two speakers only and the choice fell on the Mackies. The only reason I sold those were I bought the SR1530's instead with 1500 subs. Heavy, but great sound. For smaller jobs I use one 1500 sub with four small Voice Contact speakers, 180 Watts (oh here we go!) each. They sound fantastic, so the choice might be greater than the two you mentioned. My .02!

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Roy-Andrč