I have my digital cable box hooked up the the 1070 using the analog inputs. When I put the selected input in Bypass mode I get a nice 2ch stereo signal that has plenty of volume and I don't need to turn the volume dial up much on the 1070. However, if I put that same input into any Dolby mode the volume produced by the amp drops way down. I need to crank the dial up by at least 15dB to get it back up to the same volume it was producing in Bypass mode.

Does it really take that much more power to produce the Dolby signal as apposed to Bypass?

Also, I don't have any surround back speakers and have them set to "none" in the config. Am I supposed to still get the PLIIx options?