Loudspeaker issue.
We have a desktop computer with a couple of loudspeakers attached, and under the desk is a 'gang bar' into which half a dozen peripherals are plugged, printer, modem, telephone transformer for cordless phone, etc. etc. including a small desk light which is switched on by a rotary switch that is also a dimmer, this is currently fitted with a standard bayonet cap 60 watt bulb, not one of the new eco-fluro things, or halogen.
When we turn on this light the adjacent loudspeaker 'booms' for a few seconds, not a sizzling sound as if there might be a loose plug, or wire, but a repetitive 'boom' at the rate of approx 1/2 second interval repeated for about 10 seconds.
WTF ? Is this some interaction through the computer connection to the loudspeaker, in which case might it be injurious to the computer, or is it some totally different cause ? Is a first for me, and 'tis a puzzlement.