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Old 8th July 2010, 11:28 AM   #1
diyAudio Member
Join Date: Jan 2010
Default Replacing Seas Tweeter Voice Coil

I'm expecting replacment VC's for SEAS H1212 tweeters and was wondering if there are any tips that you all can give me. I ask because I ran into this during a search:

""In case you ever need to replace the voice coil assembly of your tweeter, here is the procedure for re-assembly:

Before you fully tighten the front plate, apply a 2 volt sine signal at 500Hz. Push the front-plate to try to stop any distortion and tighten the screw closest to this point first. (This low frequency allows large excursions without much sound to better identify mechanical noises.)
If this doesn't work, assemble the dome and apply the above signal so that you hear any distortion. Then use your fingertip and gently push down on the surround of the dome and move your finger around the circumference. This may put things in alignment.
A tip regarding ferro-fluid: It is important to remove the voice-coil assembly slowly from the magnet system. Then the magnetic force will pull the ferro-fluid off the voice-coil and back into the gap. If it's the same voice-coil assembly you first take out and then put in, it's no problem. No fluid should be lost unless you wipe it off the voice-coil.

Bjorn Magne Idland
Laboratory Technician
SEAS, Norway "

I don't have the means to apply a 2V 500hz signal so is there anything else I should be aware of when changing these out other than replace the coil "very slowly"? Thanks.
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