[Elecraft] K3S speaker vibration/whine

[Guy Olinger K2AV]

It is possible to warp a speaker frame by tightening down one mounting
screw all the way before equalizing the torsion on all the screws.
Unfortunately BTDT.

Need to get screws just barely finger tight all around before tightening
further. Even then should be only tightened a half turn at a time, N S E W
order until all are tight. Dropping is very bad.

73, Guy K2AV

On Thursday, October 22, 2015, <ae4pb at carolinaheli.com> wrote:

> I've not gotten into it yet. My speaker has never been dropped but I'll
> check.
>
> -----Original Message-----
> From: Ron D'Eau Claire [mailto:ron at cobi.biz <javascript:;>]
> Sent: Thursday, October 22, 2015 3:24 PM
> To: ae4pb at carolinaheli.com <javascript:;>; 'Randy Moore'
> Cc: elecraft at mailman.qth.net <javascript:;>
> Subject: RE: [Elecraft] K3S speaker vibration/whine
>
> 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:jermo at carolinaheli.com <javascript:;>] On
> Behalf Of ae4pb at carolinaheli.com <javascript:;>
> Sent: Thursday, October 22, 2015 10:13 AM
> To: 'Ron D'Eau Claire'; 'Randy Moore'
> Cc: elecraft at mailman.qth.net <javascript:;>
> 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:elecraft-bounces at mailman.qth.net <javascript:;>]
> On Behalf Of Ron D'Eau Claire
> Sent: Thursday, October 22, 2015 12:43 PM
> To: 'Randy Moore'
> Cc: elecraft at mailman.qth.net <javascript:;>
> 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>
>
>
>
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