I don't think the noise is activated by a spike or dropout on the power line. The internal power supply of the CT-400 is very robust and regulated and I doubt if a dropout would get through. There are varistors added inside the electrical panel and the amp is fed by current passing through a computer power director which contains additional varistors.
The amp has been in the basement since 1993. In 2002 it was placed in a rack inserted into a partition wall. The room temperature and humidity of the basement vary throughout the year, but the noise was more prevalent in summer.
The amp is left on 24/7 and feeds speakers in the basement and two other ground floor rooms. including the master bedroom.
I have been awoken from my sleep in the middle of the night by the bedroom's right side speaker starting to emit the popcorn noise.
If I shut down the amp and restart it imediately, the noise returns.
If the noise is precipitated by a neighbor's wireless device, I can't explain why such a device would be operated at 3 AM in the morning.
It may be a coincidence that the noise stopped when my neighbor moved away.
It may be that keeping the chassis as cool as possible by having the chassis fan stay on permenantly is the reason the noise has stopped occurring.
Today I removed the patch wire that was keeping the fan on all the time. The basement room is now very quiet compared to before.
It may be months from now before the same conditions repeat themselves which lead to the noise returning.
Thanks for your comments.
montrealMember Since 08 Aug 2005
Offline Last Active Jan 14 2013 01:04 PM
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