via HDMI would be your best bet to get the most out of the audio capabilities of the AVRI have bought a used Yamaha RX-V667 AV Receiver with 5 speakers and a sub.
My question is how do I connect it all up to the U1 so I get the full surround sound.
Also make sure your content is in surround sound. Otherwise it won't give you a full surround experience.
if streaming from the internet its more than likely just to be stereo at bestHow would I know that, sorry if that sounds a bit thick.