cones more likely are OK especially if OK visually. voice coils might be under jeopardy. when your amp fries you'd definitely know or you can try to find matching complete drivers.
11 responses Add your response
I have not looked at the filter cap yet but last night I had a look at the woofers.
If I tap hard with my finger on either of the woofers in the suspect cabinet I can create the noise that I am hearing. When I slow down and push gently it seems that the sound is created by a rubbing / knocking on the side of something. If the woofer is pushed in anything less than dead square so perhaps loose / worn surrounds are allowing it to respond and get off axis or is this a symptom of a signal issue causing a funny response?
i will check the electronics next
It's possible that the voicecoil(or former) is rubbing the magnet plate or pole piece. It's important, when trying to determine if rubbing is occuring, to insure an aligned movement of the voicecoil in the gap. The driver should be out of the cabinet, on a flat surface(magnet down). The cone should be manipulated(gently and evenly) from exactly opposite sides(180 degrees) of the cone's edge. You should be able to tell(visually) if the spider(suspension at the narrowest point of the cone, or glued to the voicecoil) is deformed at all. If the foam or rubber at the outer circumference of the cone is not deteriorated or torn; it's still good.
Rodman99999, "IF your drivers are the problem."
Rebuilding drivers shows less than 1% of Bill's abilities, though obviously represents the lion's share of his business. He'll make most any repair a loudspeaker requires.
For a bit of background, he does things you'd never expect paints cars, engine/transmission rebuilds, turntable/electronic rebuilds, lung transplants(just kidding on that last one), all at expert level. See that perfection itself in his Packard he painted himself http://www.6moons.com/industryfeatures/forbidden/forbidden_10.html