Yeah, almost certainly a custom version of the PD2150.
My recommendation would be to mount the driver so that the coil is pulled true, and leave it for a couple of weeks.
If that doesn't work, apply some heat around the spider to soften things up - should accelerate the process.
Chris
My recommendation would be to mount the driver so that the coil is pulled true, and leave it for a couple of weeks.
If that doesn't work, apply some heat around the spider to soften things up - should accelerate the process.
Chris
There is a secret professional recone folks know. So don't read further or the secret will get out.
If you push carefully going around the edge of the dust cap you should be able to determine where it is rubbing against the outside pole piece. Then with a small stick you can gently massage the spider on that side to slightly stretch and loosen it. That should center the voice coil slightly and remove the rub. Of course if it rubs on the inside loosen the spider opposite the problem.
If you push carefully going around the edge of the dust cap you should be able to determine where it is rubbing against the outside pole piece. Then with a small stick you can gently massage the spider on that side to slightly stretch and loosen it. That should center the voice coil slightly and remove the rub. Of course if it rubs on the inside loosen the spider opposite the problem.
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I would carefully remove dust cap, insert spacers between the voice coil and center pole piece. Then gently spray the cone with mist of water to make it slightly wet and loose. Then let dry. This will fix it in new center position. Worked for me on a number of occasion with an old rubbing vintage woofers.
with a driver that size, and likely weight, is it possible the pole or magnet shifted from being dropped?
or could the voice coil be loose from overheating?
either way without driver id fixing it might be a challenge.
is this a single/lone driver or do you have another?
or could the voice coil be loose from overheating?
either way without driver id fixing it might be a challenge.
is this a single/lone driver or do you have another?
If the magnet and pole piece has shifted, it would clamp the voicecoil firmly in place.
Trust me, I've experienced that one directly on a 15" ferrite woofer. It ended up in the bin.
Chris
Thank you all for the info!
I'm hoping one of the less invasive methods will work.
I got these from a friend. The driver that has the slight rubbing was not mounted with the proper type of screws in 4 out of the six holes. instead of the threaded machine screws they were more like giant wood screws but with bolt heads. It wasn't being held in place evenly.
If I'm perceiving the location of the rubbing sound correctly it is center bottom. When I removed the driver and placed it on the ground facing up, you can gentle move the cone without it rubbing at all. When it was mounted if you applied a very slight pressure on the bottom section of the cone the rubbing would stop. Hopefully some gentle cajoling will do the trick.
Would it be a bad idea to warm up the spider with a hair dryer on low and play a low volume test tone through it? ( I would have it laying on its magnet facing up) I was just wondering if that would help recenter it.
The enclosures they are in are rather interesting. They're sealed but almost have baffling in them, which I don't understand the purpose of. I took the back off and I pulled some of the insulation out to get a peak. What do you think? They weigh a ton.
I'm hoping one of the less invasive methods will work.
I got these from a friend. The driver that has the slight rubbing was not mounted with the proper type of screws in 4 out of the six holes. instead of the threaded machine screws they were more like giant wood screws but with bolt heads. It wasn't being held in place evenly.
If I'm perceiving the location of the rubbing sound correctly it is center bottom. When I removed the driver and placed it on the ground facing up, you can gentle move the cone without it rubbing at all. When it was mounted if you applied a very slight pressure on the bottom section of the cone the rubbing would stop. Hopefully some gentle cajoling will do the trick.
Would it be a bad idea to warm up the spider with a hair dryer on low and play a low volume test tone through it? ( I would have it laying on its magnet facing up) I was just wondering if that would help recenter it.
The enclosures they are in are rather interesting. They're sealed but almost have baffling in them, which I don't understand the purpose of. I took the back off and I pulled some of the insulation out to get a peak. What do you think? They weigh a ton.
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The Celestion UL6 are known for rubbing. Those speakers need to be rotated every now and then due to the weight of the voice coil.
Mount the speaker upside down and wait and see if it gets better.
Mount the speaker upside down and wait and see if it gets better.