Definitely not. Modern receivers like last year's Denon 4311 can EQ 11.1 channels already, so another fractional channel (subwoofer output below 250Hz) won't strain the processing chip. You'd never be able to support your belief with measurements, because they would demonstrate that the opposite is true. EQing the acoustic interaction of multiple subs can produce better response AND greater consistency over a wider listening area than EQing each sub independently.