I often heard the VP150 has been criticized for having sibilance (over-pronounced "s", "sh" sounds,) a lack of bass and poor off-axis response with too great a degree of timbral change. but because I have axiom m60, QS80, would it be okay if I buy other brand of center speaker to match these speakers? I heard it is best to match the sound signature of the same brand, is this true! should I just buy some other brand center instead vp150??