Forte I
- Thread starter elmostro
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moray james
Super Member
make your repair with weldbond adhesive and some coffee filter gut about two inches wide. Make sure you wet the edges of the tear and then work them together so they are flush to one another the patch goes on the inside of the cone use just enough weldbond to wet the filter paper and the surface of the cone. Do a dry run first matching the cone pieces back together. This will be good as new and you won't be able to tell the difference between it and the good one. There are no available replacements for these. Remember the passive is simply a weight on a spring doing exactly what the air in a reflex tube does which is bouncing back and forth it is a very simple device. While you are at it if you add 2.5 ounces of dead weight to the centre inside of your passives using steel flat washers you can re tune them for some addition lower bass response. Don't use more weight than that. This will get you bass into the high 20's which sounds very nice.
moray james
Super Member
I don't remember what speaker the KD-12 was from. You are making this more complicated than it needs to be, just do the simple repair and you can be playing music in an hour.
BobbyBluz
Super Member
I've posted previously we used 3M black weatherstripping adhesive for rental speaker repairs back when I worked for a Pro audio store in the 80's. It was my idea to try it and it worked far better than anything else that had been tried. Put a thin layer on both ends of the tear, wait about a minute then press them together carefully. After that smear a layer on both sides of the repair and let it dry. The stuff is elastic, black and doesn't harden over time. Any auto parts store should carry it.
