I've been putting together an HT system piece by piece - started with a receiver and fronts, then a sub. Now I'm considering adding the matching center. My fronts (Axiom m22ti's) are placed fairly close together - only about four feet apart, and I'm running an HK AVR220 in a phantom center mode (vmax f). Will I really notice a significant difference by adding the center (VP150) or am I better off adding surrounds first? Thanks in advance.