a few capacitors venting and a speaker

Some caps were overvolted at 100 Volts AC via two transformers in cascade.
By reducing the 240 volts mains voltage from 150 to 100 Volts the caps don't seem to explode but vent more for a longer time.
I tried a couple of caps in the evening but it became too dark for my camera, hence a LED light was used which actually enhanced the white smoke plumes.