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What would be causing the right side PC speaker to make a small popping/cracking noise and at the same time set off a sound/lighting affect from the toy pinball machine that is battery operated? I'm not the only one to witness/hear it happening. It's a random timing thing too. Would power surges in the walls be able to do this? Or is it something else? Also, the speakers only make odd noises when I run the paper shredder but I know why that's happening. I just don't understand the battery operated versus electrical connection thing going on.
And got the following answer:
When playing pinball, there are little relays that trigger different things, sometimes just advances in scoring or solenoids that bounce the balls off the walls of the machine plus little buzzers and motors, all of these things are electrically "noisy". Even though it is battery powered it is still electric. When these electric currents 'jump' between contacts to complete the circuit, tiny sparks are created. These sparks emit radio signals. You can prove this by taking a radio set to AM and setting it near the pinball machine while playing. Listen to all the pops, buzzes and crackles that go along with the game action! So that's a radio, how do these signals get into your computer speakers? Well, long speaker wires also act as radio antennas. It's likely that your computer speakers are unshielded thus not preventing radio interference. These spark radio transmissions are picked up by the wire and then amplified by the speaker's built in audio amplifier and voila you have pops and crackles coming out of your speakers! To eliminate this, besides the obvious turning the speakers off when not in use, you could wrap the speaker wires around a toroid core closest to the speaker and this will block the interference. I believe Radio Shack still sells these, otherwise you'll have to find a real electronics store in your area.
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