K2 speaker

[n3drk]

Has anyone had a problem with their K2 speaker? Mine sounds like something is loose whenever I listen to cw at around 60% volume, like something vibrating. I opened the rig up and everything is very secure so I am wondering if it is the speaker.

john-n3drk
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[Don Wilhelm-3]

John,

It is very likely a wire stuck (magnetically) to the speaker and touching
the speaker cone.  It could be on the outside of the speaker (if you are
fortunate) or it could be on the inside and you will have to remove the
speaker to see it.

73,
Don W3FPR

> -----Original Message-----

>
> Has anyone had a problem with their K2 speaker? Mine sounds like
> something is loose whenever I listen to cw at around 60% volume,
> like something vibrating. I opened the rig up and everything is
> very secure so I am wondering if it is the speaker.
>
> john-n3drk
>
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[KK7P]

John,

Sometimes the speaker frame gets warped after shipping or some other
mechanical shock.  The speaker magnet is very heavy, which helps
contribute to the efficiency of the speaker.  If it is warped, you can
straighten it by hand.  Both of my K2s had this problem initially, but
it was easily cured.

73,

Lyle KK7P

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[G3VVT]

 
In a message dated 24/07/05 23:06:17 GMT Daylight Time, [hidden email]  
writes:

Sometimes the speaker frame gets warped after shipping or some other  
mechanical shock.  The speaker magnet is very heavy, which helps  
contribute to the efficiency of the speaker.  If it is warped, you  can
straighten it by hand.


Reply:------------------------------------------
 
Used to be a common problem in mainly tube type TV receivers in the past  due
to heat build up in the cabinet. As Lyle mentions it can be corrected in  
modern speakers by adjusting the speaker frame to stop the effect, though a  
better solution can sometimes be to change the speaker. The effect is caused by  
the speaker voice coil being out of alignment and rubbing on the speaker magnet
 pole pieces. This causes distortion particularly on lower audio frequencies.
 Earlier broadcast radio speakers had an adjustable voice coil on the  
speaker cone that was adjusted with non magnetic feeler gauges (latterly  plastic)
to center the voice coil in the speaker magnet pole pieces. With all of  these
different types a test of the speaker cone with the finger tips,  carefully
moving the cone through it's range soon detects any  misalignment.
 
Bob, G3VVT
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