Ok, this one is easy to explain.
Did you know that the stylus is a thing that turns physical movement and vibrations into electrical fluctuations, which is then turned into music?
So when the stylus moves (like when it is getting dragged through a record) it moves. This is eventually converted into the sound you hear.
I know you know this.
you've got 500USD of phono preamps, after all, so sound is your thing.
But with bearing it in mind are you surprised that tapping a record deck creates a vibration that is translated through the stylus to a sound?
Going even further, are you surprised that a large bass sound can create a vibration that travels up through your desk, through the stylus and back out to create a sound. This is called "feedback".
Imagine back in the days of raves when you had massive speaker stacks and loads of volume. It was a real headache back then making sure there was no feedback. Its very similar concept to microphone feedback that makes that screechy sound. It can also create a feedback loop that gets louder and louder until your equipment breaks. You've probably also worked out how it is affected by the channel gain by now too.
I hate feedback. You hate feedback. Everybody hates feedback. Apart from Jimi Hendrix. He loved the stuff.
How do you stop it?
you could:
- stop using records. (yikes, digital is the devil).
- isolate the record decks (people used to put tennis balls halves under the feet, but do whatever you want).
- make sure your speakers are not on the same table as your turntables and not pointing towards the stylus. (I'm looking at you, studio-monitor-guy)
- turn the volume down (your neighbours will probably not come around and ask for you to turn it up again)
- live with it and make strange noises. call yourself "the jimi hendrix of vinyl feedback" (seriously some turntablists use feedback to make weird tones)
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