Hi, I've got a Yamaha RN303 amplifier, connected to, amongst other things, a Dell PC with a Realtek ALC3246 audio controller through a Portta analogue digital controller to the coaxial port. I get 'noise' through my headphones, which isn't there on the occasions I connect my IPad via Airplay. So... is this something that might be improved through an improved ADC eg CYP Au-D4, or is it worth looking at a sound card with eg an optical output? Or... is there a simpler solution involving the RCA sockets? Thank you 🙂