[Elecraft] K3 Speaker cabinet resonances

[Dale Boresz]

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 in your 
case, but I'd suggest trying a replacement speaker.

I don't have a K3 so the following recommendation may not be relevant, 
but I'd also suggest that if you replace the speaker, make a thin felt 
gasket that you can place between the speakers frame and the cabinet. 
You can probably go to the local fabric store and ask if they have a 
small scrap that you can have. Using the gasket should reduce the 
likelihood of vibration between the speaker frame and the cabinet.

Haven't followed this entire thread, so apologies if this is a re-hash 
of a prior suggestion.

73, Dale
WA8SRA




Nick-WA5BDU wrote:
> 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 pretty much can't use the built-in speaker.  At 
> moderate volume levels, even band noise excites those resonances and 
> makes a kind of pulsing, buzzing noise like rough CW.
>
> For additional info - I'm not a musical "golden ear", I don't expect 
> high fidelity out of the built-in speaker, and I'm pretty crazy about 
> the K3 overall.  Yes, I know I should contact support, but I want to 
> get my facts together and maybe even make some recordings first.
>
> 73--Nick, WA5BDU
>
>
> Deni F5VJC wrote:
>> 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 
>> managed
>> to cure this cabinet resonance.
>>
>> 73,Deni
>> F5VJC
>> K3 325
>>
>>   
>
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