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I use my phone to listen to music using wired headphones, the MD-11 mini speaker, car audio using bluetooth and the MD-310 music receiver at home.
When listening to music via bluetooth, either in the car or with the MD-310, one can clearly hear crack noises, like the ones heard on vinyl records when dust got caught on the needle. No such noises appear when playing music through wired headphones.
Is this a known bug that can be squashed with a new firmware?