I just purchased the following HK Components: AVR520 PA2000 DVD50 FL8380 I’m not sure I understand the purpose 6-Channel and 8-Channel Direct Inputs. I’m using the PA2000 to power my FL and FR towers and then connected the SBR and SBL preamp outputs to the FL and FR Amplifier Inputs. I connected the DVD audio using an optical cable and the CD player using a digital coax. Do I not have this set up right? When or why would I use the 6-Channel or 8-Channel Direct Inputs? Thanks!