I have been using a Sampson studio amp 85watt stereo Servo - 170 with a pair of Tannoy mercury m2 cherry speakers. occasionally the sound will either be less loud coming out of one or the other or completely stop coming out of the either or both at once. I have started to notice a crackle coming out of the right speaker sometimes its intermittent or constant. once sound goes fully from one the only way i can get it back is by turning up the volume on my computer or turn the level input dial on the amp for the channel that has cut out.