I would be very careful using a solvent to loosen the suspension and over exercising the speaker( long excursions) I did that once and ruined a good woofer. Just use the loudness button or bass control and play it normally . Mine have all come around that way .
You are correct! It is part of the VC wire. I did push it back around the coil former and tried tucking it down with edge of a business card but to no avail. Same rattle and no other evidence of causes anywhere.i never did push the cone very far. No more than 1/4” cause the stiff surround just does not flex and I was concerned about damaging something. I think letting a 20hz signal rattle it for 20 minuets was enough to tip it over the edge. Even though was at low volume I did have the loudness engaged and bass turned 3/4 way up. It was humming for sure and that’s when the rattle started. Looks like another lesson learned THE HARD WAY on the HiFi Highway.
And so it goes. But hey, that’s how I roll.
I will keep my eyes out for aother W200 Woofer cause I really do like these speakers.
JD