Sagging Voice Coils?

Supposedly, Lowthers are famous for this. The other thing is picking up dirt and all manner of other stuff in their voice coils, and needing to both rotate and clean out the gunk.

So far, with my Hornings, I've not done either. Then again, with their circumcised drivers, maybe it's not necessary? Or, perhaps, I'm just whistling through the graveyard...

circumcised drivers

ROTFL. Who knew? Horning doesn't sound Jewish ;-)

Step Six is speaking of the spider sagging toward the magnet(read it again). Something that I ran into frequently, with older woofers, when in the reconing business. Just the opposite of what one would get, in a downward firing woofer. That would occur quite often, in the humid Florida climate. The moisture would weaken the sizing(stiffening agent) in the spider, and allow the pleats to distort/warp. On occasion; I'd run into a woofer, with a pleated cloth surround, that had the same problem, and a rubbing voice coil. It's not hard to see how the same thing might happen, do to age.

Rodman, if your referring to me, the woofer cone is pulling on the spider causing the distortion in its (spider) shape. If there was no cone weight on it, I doubt the spider would sag in its lifetime. The midrange and tweeter with their light cones gives anyone an idea, the spider itself is not the problem. That's self explanatory with the woofers weight being the major cause of this problem. FWIW, there's still a problem with sagging from the weight of the cone. Some have it more than others. Larger gaps allow for more error. Also lighter cones, stiffer surrounds, and stiffer spiders along with other design factors come into play for the failure rate. Again, the problem still exists for some.

Michael, I'm embarrassed to admit I wasn't present at the bris.