We have two Marshall Acton Multiroom that have the exact same issue. Whenever they have been plugged in the power for more than 24 hours the sound becomes distorted/crackles and it gets increasingly worse the longer the speaker is powered on.
The only solution we have found is to pull the power plug for a minute before plugging it back in. Then the speaker will play fine for another 24 hours before it starts to crackle again. However, this solution is very inconvenient.
We have reached out to the Marshall support but they are not much of a help.
Has anyone else found a solution to this issue?
Hello. I find out what the body of the combo is cracking and not the speaker itself at a volume of 20% or more. This defect is even on the clean guitar sound (All presets and FX off). However, the sound from the headphone output is great and without any defects. It feels like a badly-assembled hull combo. What to do with this? Have you encountered such problems? I attach a video. https://drive.google.com/drive/folders/1ItBycqPpDgfb10PJdC3haA5w-OeJ1hD0