Believe me MACKIE has done their homework & these speakers KICK BUTT!!!
Ive owned the opriginal 45's when they came out a few years ago...they had some heat sink issues & overheating due to the design but have since rediesigned their units to eleviate the problem.....I also performed with a pair of 350's....a bit smaller & lighter great for smaller venues but I found I needed a Powered Sub for the big events......if you get a chance check out the SM450's you wont go wrong!!