I have an LG V30 that has been retired from daily duties. I recently hooked it up to my main system as a streaming renderer for Tidal via 3.5mm headphone to RCA. I think I may go USB out with an Audioquest Dragonfly Cobalt after doing some research. I use USB Audio Player Pro on the V30. Has anybody used an old smartphone this way? Any recommendations to get better sound quality when going this route?