View Full Version : 2225H mysterious rust in voice coil gap and loos demodulating ring

05-03-2014, 01:15 PM
A friend of mine is trying to save a 2225 of mine. But the demodulating ring is loose and there is rust coming from the voice coil gap. When shaking the drive the demodulating ring can be heard rattling inside.

He will try to glue the demodulating ring in place and then put the cone back on the driver. It is probably too damaged, but it is an interesting experiment.

I am a bit curious about how this could have happened. Someone poured beer on the driver at rehearsal? :-)

Is the rust and the loose demodulating ring correlated?

05-03-2014, 01:21 PM
Hi, It could be rust I guess but most probably it is ground up voice coil/former from rubbing. You can glue the shorting ring back into position if you know how.


05-04-2014, 02:00 AM
Use LOCTITE 648.

05-04-2014, 02:29 AM
Superglue is the go. Pull the ends of a cue tip and fit it to the applicator on the superglue tube. Squash the cue tip flat with pliers so it will fit through the gap, bend to suit. Done.


05-04-2014, 02:56 AM
Thanks for input. The voice coil is intact, so there is no rubbing. It is rust. Isotrol will be used to handle the rust.

The old cone will be used instead of the new replacement cone.