Something to try, if you haven't already, is to unplug the power cords from your speakers and let them sit for 20 - 30 minutes with no power going to them. Then plug them back in and wait for the amps to go through their power-up sequence. Did this stop the noise?

Moderator wrote: Something to try, if you haven't already, is to unplug the power cords from your speakers and let them sit for 20 - 30 minutes with no power going to them. Then plug them back in and wait for the amps to go through their power-up sequence. Did this stop the noise?

Hi Moderator,
I have tried. It didn't stop.
Anyway, I contacted the former distributor (SIS Distribution Thailand) and I managed to get a commitment to fix these speakers from them but I will have to take these huge and heavy speakers to their service center by myself (better than nothing though)

From watching the video and knowing that both internal amplifiers had troubles, I immediately thought it would be issues with your power supply. Very very nice of them to repair them for you a second time. I hope you have invested in a power conditioner now, otherwise you will keep damaging the speakers. I wouldn't risk the mains power in Thailand with such expensive equipment without a power conditioner. Many people buy them when they don't need them, but you certainly do. Best of luck. Fantastic speakers and service.

Morgza wrote:

From watching the video and knowing that both internal amplifiers had troubles, I immediately thought it would be issues with your power supply. Very very nice of them to repair them for you a second time. I hope you have invested in a power conditioner now, otherwise you will keep damaging the speakers. I wouldn't risk the mains power in Thailand with such expensive equipment without a power conditioner. Many people buy them when they don't need them, but you certainly do. Best of luck. Fantastic speakers and service.

Hi, it really was from the built-in amplifiers. The distributor was really kind and responded to the problem seriously too.