Won't let me edit my post well. I'll be naughty and add another just to confirm you do have the correct adapter in that link. As I was lazy and didn't look at the link first :P.
Haha so other Aussies do exist! I'm in QLD :D. I can't find info on your speakers exactly. Sorry I see alott of people call the 5500's 5000's. However to explain the crossover frequency. I do have a sub mine are a fully stock setup. On my Z5500's the...
Don't use optical! The Z-5500 DAC is worse than warm beer. Use analog. Then go into FlexBass set 120hz Crossover and all speakers to large. Then you will see why you paid for this beast of a soundcard. As for your buzzing I have no issues on either o...