Event Powered Monitors, Popping Sound When I Power-down

I have a pair of Event 20/20 BAS Powered Studio Monitors. (Older version, no heat sinks) They're fine as far as operation and sound, but one unusual thing has me concerned. When I power-down, using the switch on rear panel, they produce a loud "pop" ..Louder than one would expect ..The popping noise seems to be louder if the monitor has been powered on for a while. Also, the rear panel gets very hot to the touch.. Hotter than one would expect. (Maybe this is related to popping noise at power-down) Maybe the pop is normal, but it seems odd to me. As for the heat on the panel, well, the later version of the same model now has heat sinks, so that would explain why. Any help? Thanks, Dan
 
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