Hi Guys,
I picked up a set of D-280's this weekend. They sound fantastic, but I can tell there is some corrosion on the coil or magnet pole. I can hear dust/junk on the inside. When they are powered down you can feel some of the corrosion moving between the coil and magnet. When they are powered they float like butterfly's, and work perfectly.
I'm planning on getting a fine vacuum hose done the back side of the magnet covers, I hope this gets most of it out. I will have to cut through the screen on the inside of the magnet.
If I am unable to get them clean by using a vacuum I may try cutting the dust caps.. but this is really going to be my last option, even after I look into paying to have them done. My other option is soaking the spider in Acetone, and carefully removing the gaskets and removing the whole cone assembly with spider and cloth surround intact. I really don't want to attempt this but it may be one of my only options...
I would not mind trying this if I could find the proper surrounds, I have new spiders on hand so this is not an issue. My worries is with the special size 3 role black cloth surround JBL used.
Or... I can pay to have them restored... Can anyone one recommend the best speaker repair shop in the US, outside CA is fine, I will ship if I know its worth it.. I love full range drivers, I've been collecting them since I was a teen. I have a few nice sets of JBL full range drivers, this is one that I feel is worth the effort.
I will get better pictures tomorrow, this was taken with my cell phone after I purchased them.. They do require some basket cleaning but not a big deal. Ill have better pictures tomorrow.
Thanks All for looking, and if anyone knows any tricks or a great repair guy, I would greatly appreciate it.
Video of drivers in action:
https://www.youtube.com/watch?v=nOsfoTGmEgo
Kind Regards,
John