A:AnswerThe subwoofer will connect with a single RG6 (subwoofer) cable. The iPod should be able to be connected via Bluetooth and if that isn't an option you would need a 3.5mm to dual RCA cable plugged into the phono input.
A:AnswerThanks for your response
I finally managed to get the BD/DVD input working. Solution was simply changing to a new HDMI 2.0 (certified cable) bought in China for USD 4. I have so many (much more expensive) HDMI certified cables and they work in different AV products (Yamaha receiver, Samsung TV) around my house but they just wouldn't work on this ONKYO TX-NR676 receiver.
HDMI passthrough is on AUTO (Eco) mode. There is no way to manually select HDMI passthrough on each input of the Onkyo. Its either AUTO or Auto (Eco) or Off