I just hooked up my old Marantz SR7000 using PCM (Optical) from my TV to the receiver and the Dolby setting. Its working in surround, but the center channel is a bit too loud; it overwhelms any warmth from the bass module or spatial impact of the surround speakers. How do I change the settings, like turning down the center speaker? I can't find the remote, but I'll keep looking in case I need it. (The center channel is turned way up because my dad is hard of hearing and we had it cranked so he could hear the narratives/conversations).