I have a StickC and a StickC+ and with both the Speaker Hat make a lot of noise when is enabled. This happen on UIFlow and on Arduino environments.
If I a usa a cheap PAM8403 extenal amplifier the noise goes away, therefore the problem is in the Speaker Hat.
I have two Speaker Hat and both produce a lot of background noise.
Am I the only one experiencing an high level of noise with the Speaker Hat?