I'm not trying to take sides but here was my biased reasoning or excuse for doing what I did originally. I was hoping the receiver would be designed to take a certain amount of vibration since it was designed to have two large subs within a certain distance. I'm guessing the receiver is CE certified which sometimes on some level is subjected to a vibration test. Also, I was hoping since the sub has an amp and LED display with circuitry the circuitry in the receiver would be fine. Who knows if the receiver is designed to handle the same vibrations but a simple move proved to decrease the vibration dramatically.
RC-64 Center, RF-7 Fronts, RF-82 Sides, RW-12D, QTY=2, RSW-15, RS-52ii Rears, Pioneer SC-1522-K, Panasonic 65VT60, 65"