Not sure where to look up the sampling rate but I imported my cds into iTunes with the default settings, they were using AAC encoder, pull down menu shows iTunes plus settings
128kbps mono 256kbps stereo, 44100 vbr. error correction off.
Going to re-enter my collection but first am going to experiment with the import settings to see what sounds best. options to import are
AAC
AIFF
Apple Lossless
MP3
and WAV
Starting with 2 cds, Aerosmith Get a Grip which sounded good on first import and Aerosmith Rocks which was kind of muddy. starting with apple Lossless which kind of sets rates automatically but with error correction on.
Appreciate the feedback, any suggestions for this please feel free to chime in, I am using iTunes but on a PC not a Mac, not a fan of windows media player but if the sound quality would be better I would give it a shot.
UPDATE:
Ok so I tried all the options iTunes had on my test CDs, and as other members who have posted in this thread and others on this subject found certain file types do not work, others work but not well. MP3 seemed the best at making everything sound uniform. Its old tech but it works. Wav sounded better but for whatever reason the Artist and song names did not copy over or the infotainment unit could not recognize them, my unit is at ver 55 so an update may or may not fix that.
I decided that if hear a CD that is way off on sound I will update them individually rather than redo everything. At some point I need to update the unit and install the Carplay/ Android auto update. will do that myself once I order the parts and find a source for the firmware I trust.