I use Spotify almost exclusively on Android connected to Bluetooth and hear a lot of noise in the sound when music is playing. The audio system is very high quality and doesn't have any bluetooth noise from Apple devices or older Android versions, it occurs only with Android Marshmallow devices.
The problem is well documented in this prior thread (Android marshmallow and sound quality), which has incorrectly been labeled as solved because solution identifed in that thread of shutting of EQ does not fix the problem.
In older versions of Android, the problem could be fixed by disabling NuPlayer in developer settings, but it doesn't seem to be possible to disable NuPlayer in Marshmallow.
My requests are:
1) If anyone experienced and solved this problem, please post the solution here.
2) If anyone else still has this issue, please take a minute to share your experiences here so that we can finally get the problem solved. It seems to be a problem that both Spotify and Google have been ignoring for a long time.