I have an SD card in the car with a selection of music on it. All the files are WAV in 44.1kHZ 16 bit stereo. They were converted to this from Apple ALAC lossless using iTunes. Before that they were ripped from CD (by me) or downloaded from Qobuz (a lossless audio download site). The SD card is a good quality class 10 example. When listening to the radio I have adjusted the treble setting down a few notches from the default; this is just my personal taste and I think the music sounds fine. However, when listening to the WAVs from the SD card a lot of them sound unpleasantly harsh, even with the treble setting as low as it will go. The problem gets worse at higher volumes. I did wonder if iTunes had somehow distorted the sound during the conversion process, however put the SD card into my PC (which has a decent soundcard and set of speakers hooked up to it) and listened to the same tracks back to back from the SD card and the original CD, they both sound fine on there. I have the B&O speakers (otherwise fantastic) but not sure if this is something to do with that or just what the car does when playing music from an SD card. I find it doubtful the system is faulty because the radio sound does not have this issue. However, the car seems to be applying some strange EQ settings to the SD card which is spoiling my enjoyment of the otherwise superb B&O system. Has anyone else had similar issues?