Effect of Other Magnets Nearby
Recall science class when iron filings are dropped onto a piece of white paper over a magnet. The filings trace lines of magnetic force. If another magnet is pushed nearby, it changes the lines of force. Hence, a powerful magnet near your speaker is going to distort the lines of force and distort the sound. Keep your magnet away and the speaker should be fine, unless you are keeping very powerful magnets around the house.
No no, it's just the pickups and electrical fields/radiation interfering.Sounds like you have some serious ground loop issues?
Just need enough gain on a distortion amp to detect anythingGuess you can use guitar to track surveillance bugs.
I use "3M Dual-Lock" better grab/tight fit not as loose as velco. Works well for me ... yes, you need to tweak User profile to your own custom liking as far look to right or left movement/acceleration required.Don't worry. I wouldn't personally use magnet for this, because why when good velcro works just as effectively, but it won't do anything to you or to your headphones.