Hello, I am thinking of installing one Dahlquist QX20R rear back speaker, mounted i the center of the rear wall in my listenting room. My receiver is a SONY ES STRDA4ES and is 7.1 capable. How do you connect the rear "6.1" back speaker to the amp section?? There are two amp outputs one for back left and one for back right....do you just pick one because the information in EX/ES is tha same for both??? Thanks in advance! Alex Raleigh, N.C.