Speaker noise and thumping from AC power
I don't know if this is the right place to post this, but I need some help solving an audio problem I am having.
I live in Nepal, and there is frequent 'loadshedding' here, which means the power goes out quite regularly. When the power is here, the voltage fluctuates quite a lot too. I have a whole-house servo type voltage stabilizer for these fluctuations and I have a whole house battery backup/inverter system.
When I am on the inverter, everything is great, no buzzing, thumping or anything. But when the city AC line is present, I get a thumping sound through my speakers as the voltage fluctuates, and the stabilizer responds.
Is this coming from the AC line or from the stabilizer itself? Is there any way to isolate my speakers from this? It is quite loud and annoying.