Motors are notorious for throwing out hash, and they have large power swings during cycling. There may be 2 motors in your fridge working at different times.
Poor contact on the fridge outlet could cause increased draw or even small arcing. Smooth power delivery to the motors in the fridge can cause the motors to run smoother, and maybe put less hash on the line.
I don't know exactly what was happening in your case, but it is clear that the fridge was affecting your powerline negatively, by some kind of outlet contact flaw. Perhaps the fridge is cycling less often, and it will not affect the audio system when the motors are off.
If you like this kind of upgrade, you should try battery power. Battery takes the whole power feed thing into another level entirely.
Poor contact on the fridge outlet could cause increased draw or even small arcing. Smooth power delivery to the motors in the fridge can cause the motors to run smoother, and maybe put less hash on the line.
I don't know exactly what was happening in your case, but it is clear that the fridge was affecting your powerline negatively, by some kind of outlet contact flaw. Perhaps the fridge is cycling less often, and it will not affect the audio system when the motors are off.
If you like this kind of upgrade, you should try battery power. Battery takes the whole power feed thing into another level entirely.