guestiguess Posted January 28, 2023 Share Posted January 28, 2023 I removed the drivers from my KP-250s to find out what is causing a clunking noise in one of the speakers, which I noticed while moving them around. In one of the K-42-K drivers, it appears a metal screen of sorts has detached from within the rear plate and is moving about loosely over the voice coil. I'm no specialist and my terminology may not be accurate. I took a few pics, which are attached. The driver appears to work fine expect for the interference (unusual vibrations) I assume is caused by the loose screen. My questions: Can this be repaired? If so, how might I DIY it? Any help would be much appreciated. I've attached a few more pics to give more details about the speakers. Thank you. Link to KP-250 Info: https://community.klipsch.com/index.php?/topic/207145-kp-250-from-early-1993/ Quote Link to comment Share on other sites More sharing options...
OO1 Posted January 28, 2023 Share Posted January 28, 2023 44 minutes ago, guestiguess said: it appears a metal screen of sorts has detached from within the rear plate and is moving about loosely over the voice coil. I'm no specialist and my terminology may not be accurate. I took a few pics, which are attached. The driver appears to work fine expect for the interference (unusual vibrations) I assume is caused by the loose screen. 2 possibilities here , there is a loose object between the dust cap and the VC , or the problem is the bug screen metal mesh which is moving about , you can use a small hook and pick screwdriver to remove the loose bug screen , if that solves the issue ....great , if you still hear a part moving , then you'll need to remove the dust cap and re-test the speaker Quote Link to comment Share on other sites More sharing options...
guestiguess Posted January 28, 2023 Author Share Posted January 28, 2023 A bug screen sounds like an accurate description of the detached object. Especially since these speakers appear to be designed for PA and other outdoor work. I'll try fishing it out as you recommend and will provide an update with the results. Quote Link to comment Share on other sites More sharing options...
guestiguess Posted January 28, 2023 Author Share Posted January 28, 2023 If you are curious, these are the makeshift tools I used to get the bug screen out. I may have damaged the driver in the process. When I push the diaphragm there is a rubbing/scratching noise. I am assuming that's not a good sound as the diaphragm from the other speaker is quiet when pushed in/out. I would welcome any recommendations. Thanks. 1 Quote Link to comment Share on other sites More sharing options...
OO1 Posted January 28, 2023 Share Posted January 28, 2023 4 hours ago, guestiguess said: If you are curious, these are the makeshift tools I used to get the bug screen out. I may have damaged the driver in the process. I would welcome any recommendations. Thanks. the VC is rubbing the cone so off-center or there is debris lodged in the VC area ...flip the woofer , tap the cone , do any particles come out ? Quote Link to comment Share on other sites More sharing options...
guestiguess Posted January 28, 2023 Author Share Posted January 28, 2023 A piece of a hook and other particles ended up inside while removing the screen. Those particles made a rattling noise at first when I shook the driver, but I did my best to shake/vacuum them out and presently no particles are coming out and there is no longer a rattling noise. 1 Quote Link to comment Share on other sites More sharing options...
OO1 Posted January 28, 2023 Share Posted January 28, 2023 Quote Link to comment Share on other sites More sharing options...
guestiguess Posted January 28, 2023 Author Share Posted January 28, 2023 The particles aren't making a rattling noise, but the diaphragm still has that scraping/rubbing sound when pushed in and out with my hand. Quote Link to comment Share on other sites More sharing options...
OO1 Posted January 28, 2023 Share Posted January 28, 2023 yeah , I thought so , the Voice coil is rubbing , that's not very good news , was it like that before you removed the bug screen ? Quote Link to comment Share on other sites More sharing options...
guestiguess Posted January 29, 2023 Author Share Posted January 29, 2023 It was not making that rubbing noise before removing the screen. Quote Link to comment Share on other sites More sharing options...
Blvdre Posted January 29, 2023 Share Posted January 29, 2023 There's probably a metallic bit(s) that stuck to the magnet in the gap, causing the voice coil to rub against it. I doubt that the voice coil is out of alignment. Unfortunately, you'll have to remove the cone to clean the gap out. This will probably entail having to replace the surround. Quote Link to comment Share on other sites More sharing options...
guestiguess Posted January 29, 2023 Author Share Posted January 29, 2023 If this were the case, is there any way to reuse the surround and dust caps? Quote Link to comment Share on other sites More sharing options...
OO1 Posted January 29, 2023 Share Posted January 29, 2023 a local speaker shop can replace the VC and clean the gap without replacing the cone , but you would need to have a Pro do the job Quote Link to comment Share on other sites More sharing options...
guestiguess Posted January 29, 2023 Author Share Posted January 29, 2023 Sounds promising. Perhaps you can tell me how to identify a reputable speaker repair shop/specialist? I'm in the Dallas/Fort Worth Metroplex. Quote Link to comment Share on other sites More sharing options...
OO1 Posted January 29, 2023 Share Posted January 29, 2023 https://www.google.com/search?q=speaker+repair+in+dallas+fort+worth+&client=opera&tbm=lcl&sxsrf=AJOqlzU4c_cKxmmMhQkxr7Lc6-BJEoH4Kw%3A1674959493382&ei=hdrVY6aAF5ikptQPmIGE8AQ&ved=0ahUKEwjm1vas3uv8AhUYkokEHZgAAU4Q4dUDCAg&uact=5&oq=speaker+repair+in+dallas+fort+worth+&gs_lcp=Cg1nd3Mtd2l6LWxvY2FsEAMyBQghEKABMgUIIRCgATIFCCEQoAEyCAghEBYQHhAdMggIIRAWEB4QHTIICCEQFhAeEB0yCAghEBYQHhAdOgQIIxAnOgYIABAWEB46BQgAEIYDOgcIIRCgARAKOgoIIRAWEB4QDxAdULwIWNdBYLtIaABwAHgAgAFziAHdCZIBAzkuNJgBAKABAcABAQ&sclient=gws-wiz-local#rlfi=hd:;si:;mv:[[33.0592706,-96.6275387],[32.703059599999996,-97.4925526]];tbs:lrf:!1m4!1u3!2m2!3m1!1e1!1m4!1u2!2m2!2m1!1e1!2m1!1e2!2m1!1e3!3sIAE,lf:1,lf_ui:2 Quote Link to comment Share on other sites More sharing options...
guestiguess Posted January 29, 2023 Author Share Posted January 29, 2023 Got it, so a Google search is the way to go. I appreciate the guidance and advice I've received on this project. I'll be looking for a repair shop now. Sounds like I can bring them the driver by itself instead of the entire speaker box. Quote Link to comment Share on other sites More sharing options...
guestiguess Posted February 3, 2023 Author Share Posted February 3, 2023 Will the woofer with new parts sound different from the original, unmodified woofer? The speaker shop I spoke to recommended getting both done. But at $120 for the one woofer repair, I'd like to avoid doing two. Quote Link to comment Share on other sites More sharing options...
OO1 Posted February 3, 2023 Share Posted February 3, 2023 No , the 2nd woofer is not damaged , no reason to touch it , what kind of repair are they doing ? are they reconing the speaker or just replacing the voice coil ? a recone kit costs 45-50$ Quote Link to comment Share on other sites More sharing options...
guestiguess Posted February 3, 2023 Author Share Posted February 3, 2023 Per your advice above: "a local speaker shop can replace the VC and clean the gap without replacing the cone , but you would need to have a Pro do the job" They quoted replacing the VC. Quote Link to comment Share on other sites More sharing options...
OO1 Posted February 3, 2023 Share Posted February 3, 2023 a new VC will repair the speaker , and you'll be all set , I recommended a Pro , Because the Job is delicate . Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.