I just received a pair of 2425Js that I recently purchased. These were cheap with blown diaphrams. I'm converting them to H models (8 Ohm) for my Urei B series duplexes. This is the second pair of these that I've picked up and inspected.
Question is this: Has anyone noticed the foam in the back covers turning into a gummy mess over time? That stuff is nasty? What's up with that?
The foam will be replaced along with the diaphrams, but it's just weird that it gums up.
Has anyone experimented with other products in there? Years ago I ran some LMS sweeps on Altec 288 drivers with no foam, foam and 100% cotton quilt batting. There was no significant difference in any of the test curves.
What's the best replacement here?
eso