Is there any reason the wire would move intermittently? That combined with a loose connection certainly can be the reason. Other stuff, power-generation problem in the amp. Like a bad solder-point, ...

I have a "Boss rev435" 300w x 2 car amp that I used for a little while until it stopped working. I have tried using it with full pass, low pass, tested numerous speakers, and three different subs in ...

Imagine being asked to provide sound reinforcement for a meeting that occurs in a large room, where anyone can be the speaker, and in a situation where microphones would hinder the flow of the meeting ...