Report "My TH-15A starts making VERY loud crackling noises after a few minutes of being turned on. It does not matter if an XLR cable is plugged in or not, and the volume control does not change the volume of the cracking at all - the only way to fix it is to turn it off. Before the cracking noise starts, the speaker works normally. Even if it is set to a very low volume, the noise starts after a few miuntes. Nothing on the board looks burnt, all the condensators seem fine as well. As I do not have warranty left, I wonder if this is a known issue and if there is any way to fix it? ,,Thank you in advance!"