I have my surround speakers high up on my side walls, pointing toward each other. They are about three feet above my head when I sit at my reference listening position. If I measure to the wall (with the speaker) in a straight line, the measurement will be about 6 feet, whereas if I measure from my listening position diagonally up (so the measurement goes to my speaker) it is around 8 foot. Therefore there will be around a 2ms delay discrepancy depending on what measurement I choose. Also, the fact that my speakers point toward each other, rather then the downwards toward the listening position may also effect what measurement I need. Can someone please advise me about the correct position and delay measurement for surround speakers high up on the side walls?