I recently purchased a ONKYO TX NR636 A/V receiver to replace my eight year old ONKYO TX SR606. Right now I have a 5.1 setup and sacrifice my rear channels for Zone 2. I would like to use my 606 to power Zone 2 and get my rear channels back. My 636 has Zone 2 "outs" but I don"t know where to plug into my 606. Can somebody help me.