I have read various posts about positioning of rear speakers for ex/es systems, i now have my rears either side of my listning position, the surround backs(x2) i have behind my listning position and about 4 feet apart, i read that its best to put the 2 speakers next to each other for best effect, my problem is i have dipole speakers. would it be best to only use one dipole speaker for surround back and not use the other one ? Also are the rear back speaker(s) supposed to be higher than the side speakers ? thanks just had a thought, i could stand the rear back speakers on top of each other ??