I have had many posts my new JBL speakers. Many helped me tremendousle. Now let me share a few things. Note that I only have a DPL receiver right now so my set-up is limited. What I have is: Ncenter N26 mains Bose Model 100's (will replace in future) Sony Sa-wm40 (just got yesterday) The problems I reported on were sibilance (more so in the ncenter than the N26's. Using AVIA (set-up for DD5.1 but good for setting front channels in DPL). I set things up with AVIA and after playing aroung with settings and placement I got all of the tests in AVIa to be quite flat. The timber was off some in that the Ncenter was brighter than the N26 but not bad. Well It was not the ncenter. With the ncenter sitting flat on top of my TV (53hs10) which has a very large plastic top the Ncenter was coupling into the top surface and appeared to be acting like a sounding board except it seemed to accentuate the HIGHS. I put the speaker up on rubber feet to isolte and also tilted down to help voice location. I can tell you now the timber is matched. The test in AVIA is smooth no tonal change moving left to right. I just watched a movie called "pulse" if you can catch it this is a great movie if you want to get alot of side to side movement that is extremely well done. you just can not tell the sound is switching from side mains to center. Have a little work to do with the SUB but the Sa-wm40 seems pretty seemless in listening and in all the sweep tests using the SPL meter some dips and peaks but in general I couls get it to hols +/-2db down to 30hZ. I am sure when I get a new Denon or other receiver it will just get better but right now this system is impressive enough. Music also sound crisp and clear.