I have an Onkyo TX-DS989, and have a 7.1 setup. I have input the correct distances for my 7.1 setup, and have calibrated with a SPL meter. My question is this. My rear speakers are only 3.5 feet behind me, while my side surrounds are both 8.0 feet away. There is a relative delay setting on my receiver, should I consider adding delay to my rear speakers to compensate for the difference in distance between my side and rears, and if so, what would the formula be? My receiver adds -4 to +6 ms of delay. I have played around with the delay, but am not sure if I am on the right track. Any help would be great. My front speakers are all at 12 feet away.