edit I am not looking for a repair, I am trying to learn about what could cause the strange behavior simply for the sake of science.
Ok so I have an old Yamaha sound system that is mostly broken (over 20 years old) the only thing that remains working is the speakers. They use the red/black clamp terminals (2 wires per speaker) with exposed end wires that go to the system. The input is coming from my PC which has a 3.5mm (motherboard) to red/white cable (sound system).
The odd behavior is that sometimes, usually when something is jostled or my cat jumps on one of the speakers or even getting up from my chair, the sound becomes very weak and favors one speaker (not always the same speaker). Now I don't really know the cause of this, but the part that confuses me is how I am able to fix it.
I open up the Playback properties and go to the properties of my device, then to the Advanced tab and click 'Test'. This plays a melody first in one speaker, and then in the other. Then after that the sound is at full power again and coming from both speakers!
Seems odd to me, especially with the randomness at which it goes all weak and lopsided, but the fact that just running a sound test restores it makes it even stranger. Any idea what is going on here?