What exactly does the 5ch stereo make happen? is it really 5ch mono from all 5 speakers? Why do I have a lack of base when switching to bypass, and also when listening to regular CDs in PLII-M mode (DVD player)? Just trying to understand what is happening, maybe I didn't set something up right? I'm vey happy with gobs of base with PLII-C watching movies (cable box), and with CDs in 5ch stereo (DVD player), and 5.1 movie DVDs. Can anyone comment on what is happening?