I recently updated my Home Theater with new equipment (projector, screen, AVR, Blu-ray, power conditioner) and I am looking to replace my surround speakers and subwoofer. I ordered Axiom QS4s for the sides and rear and I was looking at one of the SVS subs (PB12 or PC12), I currently have vintage floor standing Snells; J-IVs and matching center across the front (I really like the way these old speakers sound). Do I need to be concerned that I am not using speakers all from the same brand/family, if my F/C/R match, surround match and independent Sub? I'm thinking if I perform a calibration I should be ok - right?