[Elecraft] K2 speaker

[G3VVT at aol.com]

In a message dated 24/07/05 23:06:17 GMT Daylight Time, kk7p at wavecable.com  
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