I have a Digi+Pro setup on a RPi3 and Volumio. It works very well, but I'm getting "pops" between songs. Reading the forums, it would appear that it's my DAC/amp that's causing the problem. It's an old (but good) Sony system (STR-DE935). I have a pair of vintage Bose 10.2 180w speakers that I really like. I'd like to buy a new DAC/amp that will take the optical TOSLINK input from the Digi+Pro and cleanly amplify the sound for my 180w speakers.