When I switch the amp on it makes a loud buzzing sound that comes from within the amp itself and also comes though the speakers. It gradually fades away over a couple of minutes. What could be causing this? I have checked all my connections and everything seems fine.
This sounds like a problem with the protection circuit, and/or the speaker relays. More specifically, a capacitor within those circuits that is not behaving properly. I strongly suggest having it looked at ASAP.
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Check the speaker wiring for shorts, a common problem. If everything checks out there may be bad solder joints on the main board especially in the output stage, or there is a fault in one or more driver transistors.
I would suggest that the fuse in the amplifier has blown. This is usually caused by a bad amplifier component (duh!).
The unusual part of your problem is that sound is being passed. When a component dies, signal stops as the continuity is broken.
Which could also suggest the power supply. Transistors work like relays, you turn on the control signal and the transistor opens or closes. It isa possible that this control voltage is not being passed.
Hi arda5 Did you try swapping speaker connections left for right on the back of the amp to isolate the problem. If the fault stays with the speaker, then that is where your problem is. Try this and get back to me here with the results.