In a message dated 24/07/05 23:06:17 GMT Daylight Time, [EMAIL PROTECTED] 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 _______________________________________________ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
