Question Horrible buzzing sound with LG C5 and ext DAC!

[basicchannel]

Hello

Following my recent query on this forum, I purchased a Topping E3011 Lite for my new LG 55 C5 tv.

After setting this up, the Live TV works ok but all streaming services just make a horrible buzzing sound

I can't see any setting which might fix this

Can anyone advise please??

Thanks