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Possible cause of the chirping may be the home security system or a wireless computer device such as a wireless modem or router broadcasting into the surround area and being picked up by your equipment
I seem to remember something about the ISP's incoming signal for the computer modem Pinging it
Just a WAG
Peter ... I once had a pair of Sota 3 way speaker that I wired backwards .. sent the power from the amp to the woofer and then jumped the midrange from the woofer and jumped the tweeter from the midrange ... this created quite a draw on the woofer and did something to the woofer's impedance ... this caused the woofer voice coil to constantly bottom out on peak passages and the woofer would make a very loud and frightening bang or clacking sound ... I don't think this is your problem
The single chirping sound you are hearing may be caused by what is referred to as Modem Ping being pick up as airborne
I also wouldn't rule out your alarm service pinging your house's security system to verify it's connection
Try removing the cable feed from the street that goes to your computer modem's input and see if the chirping goes away ... you may also want to take a look at your home security feed from the street
here's some info I dug up on the net about modem ping
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You may want to go over both speakers and make sure all the nuts and bolts are tight. Pay extra attention to the grill cover and feet. If any of the fasteners/inserts worked themselves loose, the noise could be caused by the metal/plastic inserts rubbing against the wood.
It would be a good idea to list your entire system. The problem may lie somewhere else. For example, if you have any type of computer audio setup, its common to have the usb 2 system overloaded without realizing it. If the computer has trouble keeping up with everything, you will definately here some strange noises, including a chirp.