My Marshall Code 100 Combo Amp is making a ringing noise unless i push the the bluetooth Pair option.. none of the knobs or presets will make it go away. however if i turn the master volume up all the way it will slowly as the master volume goes up make the ringing noise quieter.. is it the speaker for the bluetooth or possibly the speakers in general... i literally just bought it and feel like i wasted my money.
Regarding your Code100 you will hear a slight noise coming from the speakers this should not affect or be heard while playing if it is we recommend that you take it back to the dealer it was purchased through.
I think I have the same issue is the sound like the one described in this video:
Did Marshall give you a solution?