I have the speaker out and can't see or detect any cone separation around the edges.
I've tried gently pushing the cone in out, there may be some rub, how to cure that?
Even laid on the floor I can hear distortion through it, especially with more bassy stuff.
Failing that anyone got a 10" RCA Flux Trans 3921112 Speaker
Marked 48-802/002 and dated 29/10/62
I need tone generator on the bench to drive it for some testing.