DQ-1W bad juju, gone good juju...
I'm finally taking on rebuilding my buddies sub and can't believe what I've come up against.
First the sub was purchased used from a mutual friend. The sub quit working, as we were told, so it was picked up cheap. This friend is NOT known to abuse equipment, but in fact has a high regard for stuff audio and uses tube equipment almost exclusively.
Problem? Cone locked up but solid. Very solid, and it gets worse.
Fast forward. I de-soldered the leads, cut the spider. Still no play. Found out, purely by accident/experimentation, that the rubber surround could be pulled away from the frame almost with ease. Blew me away how easy. Just needed to start from the very edge, inside the frame, using a paint can opener (working it slowly between the surround and lip of the frame).
So, surround removed from frame, spider cut, no luck. OK, pulled the dust cap to get a looky inside. Hmmm, something not right here. I was actually able to work the cone off the VC and remove the cone and surround intact. OH it gets better still. VC left in gap.
I grab the VC and try working it loose. No go. Hmmm. Closer examination and WTF? The gap actually was different. Tighter on one side than the other. No way, the pole is shifted? I check the magnet structure, not loose and no obvious signs it's been moved. Place a ball peen against one of the metal plates and hit with another hammer. Solid, positively solid! Dang!
My thoughts? I'm wondering if this one got through, somehow, with the pole off but not enough to cause rubbing. After sufficient playing, the VC heated up, rubbed causing friction and more heat and then expanded AND bonded between the pole and plate?
The speaker and the driver show no signs of having been dropped or jarred so it's a wonder how this happened, other than leaving the factory this way.
Is it possible to salvage this? It's one thing to re-attach a magnet structure, but to intentionally remove one and and then re-attach?
I'm finally taking on rebuilding my buddies sub and can't believe what I've come up against.
First the sub was purchased used from a mutual friend. The sub quit working, as we were told, so it was picked up cheap. This friend is NOT known to abuse equipment, but in fact has a high regard for stuff audio and uses tube equipment almost exclusively.
Problem? Cone locked up but solid. Very solid, and it gets worse.
Fast forward. I de-soldered the leads, cut the spider. Still no play. Found out, purely by accident/experimentation, that the rubber surround could be pulled away from the frame almost with ease. Blew me away how easy. Just needed to start from the very edge, inside the frame, using a paint can opener (working it slowly between the surround and lip of the frame).
So, surround removed from frame, spider cut, no luck. OK, pulled the dust cap to get a looky inside. Hmmm, something not right here. I was actually able to work the cone off the VC and remove the cone and surround intact. OH it gets better still. VC left in gap.
I grab the VC and try working it loose. No go. Hmmm. Closer examination and WTF? The gap actually was different. Tighter on one side than the other. No way, the pole is shifted? I check the magnet structure, not loose and no obvious signs it's been moved. Place a ball peen against one of the metal plates and hit with another hammer. Solid, positively solid! Dang!
My thoughts? I'm wondering if this one got through, somehow, with the pole off but not enough to cause rubbing. After sufficient playing, the VC heated up, rubbed causing friction and more heat and then expanded AND bonded between the pole and plate?
The speaker and the driver show no signs of having been dropped or jarred so it's a wonder how this happened, other than leaving the factory this way.
Is it possible to salvage this? It's one thing to re-attach a magnet structure, but to intentionally remove one and and then re-attach?
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