That only shows noise not musical damage from high source impedance, or distortion on the wave form, you need a 'scope and distortion analyser for that.Sovereign wrote:I used a thing called a noise sniffer, think it was called that. The device has a speaker on it, you plug it into the wall and it amplifies the noise on the mains or so the theory goes.
I found it quite effective and consistent.
So why waste hundreds or thousands on test gear you don't need when you ears tell you perfectly well if you have a problem.