I have switched to the K series almost 2 yrs now, and couldn't be happier. I have 2 Ksubs, 2 K8's, 2 K12's.. Been in the DJ biz for over 15 yrs now. Over my lifetime I have owned and used over 30 different speakers and systems. (JBL, EAW, Renkus Heinz, Bose, EV, RCF, Ramsa, DAS, Peavey, Celestion, Sonic, SoundTech, Audio Centron, Community, Toa, Yorkville, Mackie) I would always buy, use, and re-sell. Most of the stuff in the past would be purchased used, but within the last 5 years I have bought new. The K system replaced my previous JBL PRX512m/718S system. I sometimes miss the lower notes that only 18" woofer can provide, but ive been pretty content with what a pair of Ksubs can do. Within the last year I added a Driverack PX to the system. All it is used for is a high pass @ 55hz for the subs. The ksubs actually can get fairly loud, they just can't extend so low, so since the addition of the Drivrack, I have no intentions of getting the KW subs like I did before. Out of all the speakers from the past I feel the QSC speakers as of late have the most natural tone of all that I have owned. With the exception of a pair of EAW UB82e's that I had in th early 2000's. But im happy with what I have, and have no intentions on upgrading for awhile.