This happened in the Kancheepuram Workshop on Mantras by Naran S Balakumar.
There were issues with both speakers and the amplifiers. The sound varied from time to time, while noises were emanating from the speakers.
For sometime this was happening now and then. Naran asked us to, thank the speakers and thank the amplifiers.
The technicians attended to them. And from then onwards, the problem didn’t occur again.