Static or other weird hum problem
Hi. I have the following problem with my Tenor 300hp. With the preamp on mute, the speakers produce a zzzzz loud noise on frequent intervals. The sound sometimes is of varying intensity and often sounds like it travels through the speakers. As I was installing cables I touched the heat sinks with my cheeks and I felt a constant electricity (not static which would go away with a snap) and when the “surge” happened again the electricity intensified a little (again, on the heat sinks). An electrician and audio guy separately confirmed that they did not think it would be the electricity on the wall, they both thought it is some sort of “static”.
Any advice?