Wireless Car Play bad sound quality

Question for audiophile :)

I have just received my new BMW car. It has wireless carplay (not cabled) and I have tried with Deezer HiFi the Harman Kardon system. The sound is wonderfull if I use USB cable, but if I switch the connection to Apple Car Play the difference is clear, with Car Play the sound is much worse.

Someone else has experienced the same situation ? I have just to wait for IOS update ? I have Iphone 11 with IOS14.

Thanks.