Most advice that I have seen on surround speaker height in a 6.1 or 7.1 is about 20 to 30" above ear level and forward of your listening position.
I have a 7.1 system with my srb speakers behind the listening position about 6.5' off of the floor, with them tilted down towards the couch. My surrounds are what I am not satisfied with. Right now they are about 2' feet in front of where most of the seating is at, but they are on stands for now that are only 30" tall. I don't want to have to mount these as high as the srb speakers because of the exposed speaker wire running up the wall that far. The srb speakers wires are hidden by drapes. I have thought about mounting the surround speakers on the wall were they are, but just above my chair rail molding. This would put the bottom of the speaker at about 42", higher, but still well below the recommended height. One other complication is that I have a wraparound couch that has a back 36" high and is between where we sit and the left surround. I also use the auto eq function with mike that is built into my Denon reciever.
My question is, will this lower than recommended hieght be a real detriment to my HT system, or is not that big of a compromise? Also do you think that the auto eq (which seems to work well) can compensate adequately for this?