Amplifier Hum - Only Amp Connected
Is there any mechanical low buzz/hum emanating from the amp itself, or is it quiet and hum coming purely from the speakers? Hum is coming only from the speakers and only from the mids as far as I can tell. What do you recommend for a DC offset issue? Are the speaker cables anywhere near the power cords? I don't have a ton of room, since everything is fairly tight. I will try to move things to a different room at least to experiment. |
DC offset is a b***ch. As I said, I am dealing with a similar issue. First, I would get an electrician to go over the circuit. If possible make a clean run to your system. Replace outlets with hospital grade outlets-cheap upgrade. And, at the very least, make sure the wires are properly installed. Sometimes the ground and neutral get mixed up, then all hell breaks loose. Bob |
Does the hum sound like this? 120Hz hum. https://www.youtube.com/watch?v=pC4Uzt0qm2E If yes it could be failing electrolytic caps in the power supply. How old is the amp? Manufacturer and model? |
DC offset should not sound like a hum. You need AC to get sound from speakers. In extreme cases DC offset might push the cone in or out some but the cones will stop there and you won’t hear anything. On the plus side DC offset is easy to troubleshoot. Put any multimeter set on DC across the speaker terminals. If you see more than 100-200 mV you may have a problem (it should be zero). |
