I thought I was going crazy recently, I use Spotify and Bluetooth as well on my iPhone.
I would hear 'frequencies' coming in and out during songs, at first I didn't notice, but as I continued listening more closely it became a headache listening to music. At first I thought my B&O system was glitching, maybe the tweeters, but those 'frequencies' never existed while listening to Sirius radio.
I then used the USB cord to hardwire the connection; zero issues with sound whatsoever.
I have learned there are three levels of sound ranked from 3. AUX, 2. BT, 1. USB
The hassle of using the USB connection is worth it in my opinion especially to utilize the B&O!
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