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From: Deni F5VJC [EMAIL PROTECTED]
To: elecraft@mailman.qth.net
Sent: Wednesday, October 08, 2008 10:59 AM
Subject: [Elecraft] K3 Speaker cabinet resonances
Has anyone found a solution to the cabinet buzz from the K3 internal
speaker?
I've not used the internal speaker until recently on my
Has anyone found a solution to the cabinet buzz from the K3 internal speaker?
I've not used the internal speaker until recently on my K3 and now find I
have annoying cabinet buzz around 450Hz and 600Hz, not so good for CW!
I haven't tried any damping as yet and just wondered if anyone has
Hi Deni,
I found that placing some tape round the chassis metal work that comes in
contact with the top panel completely cured the problem. Certain notes were
causing the top panel to vibrate against the top of chassis (no matter how
tight the screws were) and having the tape between them
I tried various things recommend here on the list and I think cabinet
buzz is no longer an issue. But I still have a bad resonance or other
effect in my built-in speaker itself. In decreasing frequency, it
starts buzzing at around 340 Hz, worse at 330 Hz, slight at 320 Hz, and
then gone. I
Hello Nick,
Sometimes, due to either a manufacturing defect or mechanical shock, the
magnet that surrounds the speaker voice coil will get shifted slightly.
When that happens, the voice coil may come into contact with the magnet
and it can sound pretty bad. Not sure that's what's happening
Thanks to all who responded to this question.
Having looked into it further it seems I have a combination of cabinet buzz
and a defective speaker.
I removed the top panel of my K3 did tests and found the most bothersome
buzz at 600/610 Hz is still present with the top panel detached.
Checked
i too found my speaker buzzy. i fiddled a bit and discovered that the grill
cloth had bagged just a bit when i put everything together and was just
barely touching the speaker cone edges under certain output conditions.
i removed and trimmed it more carefully then made sure it was taut when
I tried various things recommend here on the list and I think cabinet
buzz is no longer an issue. But I still have a bad resonance or other
effect in my built-in speaker itself. In decreasing frequency, it
starts buzzing at around 340 Hz, worse at 330 Hz, slight at 320 Hz, and
then gone. I
Hi Deni,
I had a bit of resonance at 300 310 Hz. There is a screw just below
the speaker grille that holds the chassis stiffener bar to the top
cover. I found that leaving this screw just a tiny bit loose (or
perhaps, not tightening it completely would be a better way of saying
it)
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