OK, I've been experimenting with my old center (PSB100c) and the new one (VP150). I find that the vocals tend to sound slightly different. The 100C seems to be a little more bright with the VP150 being more neutral. I also notice that the VP150 seems to have slightly more presence but this is much more noticeable at higher volumes. Would this be true of a comparison of the VP100 vs the VP150? Given that both the VP100 ahd VP150 have the same woofers and tweeter What advantage do the extra driver and tweeter give?

Also, do you recommend the "large" center setting for the vp150.

Also, why no porting on your centers?

I like the sound of the vp150 but since things sound different I've been listening to old CD's. The difference is more pronounced on high freq female vocals.