Summit X, high-pitched sound

[Pete_S]

My other Summit X started suddenly make high-pitched, wheezy sound.
When I localized it to the speaker (did not know first where the sound originated)
I disconnected all the cables. When I connect power cable, sound starts.
Now it also "pulses" stops-starts-stops..

Anyone experienced anything like that? Warranty is still on, so I also
contacted my dealer.

 

[Pete_S]

Read the manual and vacuumed the speaker. Sound is gone now, let's hope it stays away.
It this common thing to happen?

 

[roberto]

Hola Pete. Yes it is a common problem. The electrostatic panel, when it is polarized, it is like a magnet to the dust. A debris, is the culprit. It is a really odd sound. A reason why it is wise to vacuum the panels at least once every two months, or if you live in a dusty ambiance, every two weeks. Here in Costa Rica, I have to do it every week. This odd noise will not harm your panel. Happy listening!

 

[soundacct]

This summer i had 1 panel with close to zero output and the other outputting only lower mids but very quiet - it was during a heat wave with high humidity. I suspected dust / humidity so I unplugged overnight, set up a dehumidifier and air filter, then vacuumed and low pressure air blasted it clean - success, good as new.

Since then, I have been covering the panels when not in use with black microfiber pillowcases (meant for body length pillows).

Could anyone chime in if that's a good / bad / neutral idea?