I have recently brought a new PA amplifier and new cables as my old amplifier took RCA and this new one takes XLR, so when my new amplifier arrived I set it up like normal and realised there is a strange noise conning out of my speakers: a high pitch noise and a humming.
I have looked up on the internet and found it to be sound interference. It is very annoying sound, but when the music is playing and I turn the volume up I don't hear it - but when the music is on mute you can hear the noise loud and clear.
My amplifier gets signal from my PC which is sent to my equalizer and then to my amplifier and both my equalizer and amp are fine as I have tested them. It is either the wire from my PC to equalizer that is the problem or my XLR from equalizer to amp wire that is the problem.
Where is the noise coming from?