That was my experience too, with an older K2 that uses the same speaker. The magnet is heavy enough to bend the speaker frame if it's handled too roughly. I dropped the top cover with speaker mounted onto a wooden floor.
I confirmed the cause by gently moving the paper speaker cone with my fingers. If the frame is warped you can feel the voice coil rubbing on the magnet. I was able to repair the speaker by putting a blade screwdriver between the frame members and the magnet and twisting it slightly to move the magnet relative to the frame. It involved a bit of trial and error to determine which way the magnet needs to be moved so the voice coil stops rubbing but it's not difficult. That was about 8 years ago. The speaker has been fine ever since. That was without a shield on the speaker magnet but if you reach in to the magnet (just visible inside the shield) it should work with the shield in place. 73, Ron AC7AC -----Original Message----- From: Jerry Moore [mailto:[email protected]] On Behalf Of [email protected] Sent: Thursday, October 22, 2015 10:13 AM To: 'Ron D'Eau Claire'; 'Randy Moore' Cc: [email protected] Subject: RE: [Elecraft] K3S speaker vibration/whine Yes, I found something about if the speaker frame gets warped it can affect the speaker cone. Maybe I over-tightened the speaker and have it warped. I'll take the cover off, remove the speaker and see what it sounds like without being installed. If that 'fixes" the issue then I'll investigate further. It's a minor thing but something I want to resolve. Jerry Moore CDXA, INDEXA, SKCC, Fists AE4PB, K3S - S.N. 010324 http://www.qrz.com/db/AE4PB An Amateur is - Considerate, Loyal, Progressive, Friendly, Balanced, and Patriotic. <snip> -----Original Message----- From: Elecraft [mailto:[email protected]] On Behalf Of Ron D'Eau Claire Sent: Thursday, October 22, 2015 12:43 PM To: 'Randy Moore' Cc: [email protected] Subject: Re: [Elecraft] K3S speaker vibration/whine Are all the top screws in place, including the chassis stiffener bar that is mounted on the KPA3 shield and attaches to the top with three screws? When assembled, there are no "vertical metal pieces that contact the top" that are not secured by screws. 73, Ron AC7AC </snip> ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
