Just got a new system (RX-V1400 with Pardigm cc370 and Monitor 7s and older Sony DVD). Problem is that on both my DirecTV and DVD player, the dialogue is sometimes hard to understand--sounds like low-frequency mumbling. Actually seems to sound best on 2ch stereo. Is this just bad sources or could this be a speaker/decoder issue? Vague problem, i know, but i'm clueless!