Good to hear about your success with the USB drive option. I’ll have to dig up my flac collection and give it a try Does the head unit have any storage to hold digital music? (The UVO head unit on my 2013 Optima did that, and it was pretty handy, but I wasn’t able to find that on the Sorento). My concern is the sole USB port would be occupied for the USB drive, so I would be able to use Apple CarPlay which currently needs a wired connection to the USB port the X-line. I really hope there is a firmware update that allows CarPlay over Bluetooth that the LX and S models supportBose Sound:
The best sound I get is playing flac music files from a USB drive. I have an extensive collection of music stored on my computer so it was easy to drag and drop albums to a USB drive. A bonus is that the head unit makes the music easy to navigate and shows the album cover, etc for each song playing.
Next best sound I've found is Amazon Music HD. The frustration there is that sometimes music drops. Maybe it's based on a weak signal in some areas.
Sirius is mostly too compressed. There's a couple of hip hop stations with good sound but too many stations sound flat, missing highs and lows.