I have the Yamaha DSR112 and it is great!
I have the Yamaha DSR112 and it is great! THere will not be a volume issue for you unless you set something in your chain very quitely. I love the definition and the control of the contour to make quiet and loud volumes sound more consitant. So far I have been running it about 6 hours a week for 2 hours each time and I have never had a problem. Nice smooth highs and a lot of "thump" in the low end. It has a nice dispersion and easily fills the room. Make sure your power amp and cab sims are on or you will feel a fool. Any questions just feel free to ask and I will tell you what you need to know or at least my interperetation of what you need to know. Seriously a great speaker though.
Forgot to mention I did not A/B with much else asthe onlystore which carried this speaker carried NOTHING ELSE...I have to say I did not really dig the K12 but others love it and it could have been settings and all of that. with the Yamaha I just plugged it in and dialed through presets and it was golden!