For rehearsal and gigging I prefer my KP500 most of the time although I also own a pair of top notch RCF TT08 acitive speakers which probably offer an even higher fidelity level than the QSCs. The KP500 sounds good with everything I throw at it, AP, EP, organ and synth stuff. I always put the KP500 on a chair or on a stable X-stand to get it on ear level. This way it sounds so much better than just putting it on the floor, tilted or not. I love this amp and I find it much easier to handle and to position than a pair of speakers.
JMTC