I have a set of speakers which has been standing in a humid place for a few months. One of them still works perfectly fine, the other not so. The other speaker creates a very static noise, barely rendering it's audio source.
Following link is a recording of what it sounds like: Good speaker vs bad speaker
The speaker consists of a sub and a tweeter, connected together by a bipolar capacitor. The circuit gets fed by a copper cable from my amplifier.
I've checked the copper cable ends, but I don't see any oxidization.
When I tap the cone, there's a lot of friction, whereas the cone of the other (good) speaker feels very smooth and reacts to my tap. I notice a very big difference between the two.
Does anyone have an idea what I should be looking for and what the cause might be?