Hi, I use the same Yamaha EMX 312s, and in speakers I used until yesterday the Yamaha SM12 V, they sound great, but at 42 lbs each, is not fun anymore, this week has been one of my busiest, 10 gigs in one week, so, I got the EV ZX1s(18 lb each), both do not make the weight of a single Yamaha, and the best part, I had to do next to nothing in adjusting EQ.
Yesterday, my first gig was with the Yamahas, the second one was with the EV and was GREAT, I have been using (for almost a year)with this set up a Roland KCW1 subwoofer, to my ears is the best combination sound wise, I know that it is more to carry, but the results speak and translate for more jobs to me.
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mdorantes