Biscuit Posted March 15, 2021 Share Posted March 15, 2021 Good morning fellow Klipsch lovers. I have a problem, and need your expertise on diagnosing. I bought a pair of KLF30s this weekend. Listened briefly in his home an hour away, and didn't notice any issues. After I got home, I hooked them up and after about 1 hour of listening (80-90db, sounded great), I noticed some vibration/buzzing from one of woofers on one speaker. Don't know if I broke something loose or what, but I was NOT driving them hard; although it was with deeply pronounced bass tracks. I read about issues with Baffles on these, so I pressed hard on all front/rear wood with no change in the offending sound. If I push on the dustcap, it "might" attenuate the buzzing, but only if pressed quite hard where the overall movement of the diaphragm is substantially hindered. I've recorded sound here so you can hear it. Do I need a new woofer? I understand they are unobtanium, but asked in modification/KLF30post on this forum if any had one from updating to HW321 drivers. https://photos.app.goo.gl/PmJ1ZXXoYXXeYjxm9 1 Quote Link to comment Share on other sites More sharing options...
Lbk Posted March 15, 2021 Share Posted March 15, 2021 15 minutes ago, Biscuit said: Good morning fellow Klipsch lovers. I have a problem, and need your expertise on diagnosing. I bought a pair of KLF30s this weekend. Listened briefly in his home an hour away, and didn't notice any issues. After I got home, I hooked them up and after about 1 hour of listening (80-90db, sounded great), I noticed some vibration/buzzing from one of woofers on one speaker. Don't know if I broke something loose or what, but I was NOT driving them hard; although it was with deeply pronounced bass tracks. I read about issues with Baffles on these, so I pressed hard on all front/rear wood with no change in the offending sound. If I push on the dustcap, it "might" attenuate the buzzing, but only if pressed quite hard where the overall movement of the diaphragm is substantially hindered. I've recorded sound here so you can hear it. Do I need a new woofer? I understand they are unobtanium, but asked in modification/KLF30post on this forum if any had one from updating to HW321 drivers. https://photos.app.goo.gl/PmJ1ZXXoYXXeYjxm9 Looks like dust cap is loose and buzzing, will have to be glued. Might as well check cabinet's for leaks also. When I did my klf 10's I took out a woofer and gentle pulled on motherboard then pushed on back cabinet board. Both where loose and had to be reglued. Others will join in and may have a better idea on how to check for leaks. Good luck! 2 Quote Link to comment Share on other sites More sharing options...
Biscuit Posted March 15, 2021 Author Share Posted March 15, 2021 1 minute ago, Lbk said: Looks like dust cap is loose and buzzing, will have to be glued. Might as well check cabinet's for leaks also. When I did my klf 10's I took out a woofer and gentle pulled on motherboard then pushed on back cabinet board. Both where loose and had to be reglued. Others will join in and may have a better idea on how to check for leaks. Good luck! That is what I thought, but pushing down pretty hard on dustcap doesn't seem to mitigate the buzzing much. Is there a good glue recommended to bind these two pieces of Poly together? 1 Quote Link to comment Share on other sites More sharing options...
OO1 Posted March 15, 2021 Share Posted March 15, 2021 17 minutes ago, Biscuit said: That is what I thought, but pushing down pretty hard on dustcap doesn't seem to mitigate the buzzing much. Is there a good glue recommended to bind these two pieces of Poly together? speaker glue , or black rubber cement 2 Quote Link to comment Share on other sites More sharing options...
Lbk Posted March 15, 2021 Share Posted March 15, 2021 2 hours ago, RandyH000 said: speaker glue , or black rubber cement Not sure if this would work. Maybe you could fold a piece tape gentle push it on cap then pull on it to see if cap rises. If you push on speaker cone do heard any scraping noise, voice coil? From the video the bottom left edge of dust cover looks loose? 1 Quote Link to comment Share on other sites More sharing options...
OO1 Posted March 15, 2021 Share Posted March 15, 2021 34 minutes ago, Lbk said: Not sure if this would work. ---it will work 100% speaker glue , or black rubber cement is what is used to glue dust caps at the factory -- https://www.amazon.com/Parts-Express-Rubber-Cement-Speaker/dp/B005X0GMXQ 1 Quote Link to comment Share on other sites More sharing options...
Biscuit Posted March 15, 2021 Author Share Posted March 15, 2021 1 hour ago, Lbk said: Not sure if this would work. Maybe you could fold a piece tape gentle push it on cap then pull on it to see if cap rises. If you push on speaker cone do heard any scraping noise, voice coil? From the video the bottom left edge of dust cover looks loose? No. Pushing in on the dustcap is noiseless. And does not seem to affect noise when playing. I too, noticed that it seems to be separating on the lower left, but not sure if it really is. Will oder the glue. 1 Quote Link to comment Share on other sites More sharing options...
Peter P. Posted March 16, 2021 Share Posted March 16, 2021 Move the woofer over to the other cabinet and see if the buzz follows. That will tell you if the woofer is the issue. Thanks for providing the audio clip. If it's the driver, I'm thinking the spider has come unglued slightly. 1 Quote Link to comment Share on other sites More sharing options...
Alexander Posted March 16, 2021 Share Posted March 16, 2021 I recently went through the same ordeal with a klf-30 woofer. I had found the dust cap was loose & the plastic ring was also causing a buzz. It turned out two of the four woofer mounting screw holes were 'soft'. So it appeared they did not hold the plastic woofer ring down tight enough. So all drivers were removes on both speakers and used wood glue and toothpicks to “rebuild” all screw holes. And in my case that was the end of the problem. Note: I had reglued the cabs seams ~two years before. 1 Quote Link to comment Share on other sites More sharing options...
Alexander Posted March 16, 2021 Share Posted March 16, 2021 I should point out that another member here found the screen under/behind the dust cover had some how got loose and it would buzz from time to time. 1 Quote Link to comment Share on other sites More sharing options...
Iteachstem Posted March 16, 2021 Share Posted March 16, 2021 It's the edges that comes loose on the dustcaps...so, pushing in the center doesn't really do anything. Check the edges on the dustcap... sometimes you can get a fingernail under it...if so, it needs to be removed and re-glued. I used 5 minute epoxy, so it will never come off as you can't really rebuild these drivers. (See my other posts on how this was done on my 5.5's) I also have some excellent condition OEM k-31-K woofers from a KLF 30 if you want to replace the entire woofer. I think 2 are spoken for, another one that's pending, but I have at least one that's still available for sure. Let me know. 1 Quote Link to comment Share on other sites More sharing options...
Biscuit Posted March 16, 2021 Author Share Posted March 16, 2021 12 hours ago, Iteachstem said: It's the edges that comes loose on the dustcaps...so, pushing in the center doesn't really do anything. Check the edges on the dustcap... sometimes you can get a fingernail under it...if so, it needs to be removed and re-glued. I used 5 minute epoxy, so it will never come off as you can't really rebuild these drivers. (See my other posts on how this was done on my 5.5's) I also have some excellent condition OEM k-31-K woofers from a KLF 30 if you want to replace the entire woofer. I think 2 are spoken for, another one that's pending, but I have at least one that's still available for sure. Let me know. Thanks for the reply! Please do hold the last one for me in case I can't fix. If you need me to buy outright, let me know. Feel free to send me a DM. I ordered some speaker glue, and will check the mounting screws, the spider, and the dustcap seal itself in the next two days. The dustcap seal is coming up on that driver, but wasn't sure if it was detached all the way through. Quote Link to comment Share on other sites More sharing options...
Biscuit Posted March 16, 2021 Author Share Posted March 16, 2021 13 hours ago, Alexander said: I recently went through the same ordeal with a klf-30 woofer. I had found the dust cap was loose & the plastic ring was also causing a buzz. It turned out two of the four woofer mounting screw holes were 'soft'. So it appeared they did not hold the plastic woofer ring down tight enough. So all drivers were removes on both speakers and used wood glue and toothpicks to “rebuild” all screw holes. And in my case that was the end of the problem. Note: I had reglued the cabs seams ~two years before. Thanks! I will look for this when I remove the driver. Quote Link to comment Share on other sites More sharing options...
Iteachstem Posted March 16, 2021 Share Posted March 16, 2021 4 hours ago, Biscuit said: The dustcap seal is coming up on that driver, but wasn't sure if it was detached all the way through. That little bit is all it needs. It will vibrate at certain frequencies and drive you nuts! 1 Quote Link to comment Share on other sites More sharing options...
Biscuit Posted March 17, 2021 Author Share Posted March 17, 2021 22 hours ago, Iteachstem said: It's the edges that comes loose on the dustcaps...so, pushing in the center doesn't really do anything. Check the edges on the dustcap... sometimes you can get a fingernail under it...if so, it needs to be removed and re-glued. I used 5 minute epoxy, so it will never come off as you can't really rebuild these drivers. (See my other posts on how this was done on my 5.5's) I saw your post on the KG 5.5's. What did you do to remove the dustcaps completely? I don't know if to try a razor blade or heat or just pull after I get a lip up? Quote Link to comment Share on other sites More sharing options...
Iteachstem Posted March 17, 2021 Share Posted March 17, 2021 1 hour ago, Biscuit said: What did you do to remove the dustcaps completely I just worked a fingernail under the lip and with a little patience, I worked it up enough to gently pull with one hand while providing pressure on the speaker cone with the other to counteract cone deformation. 1 Quote Link to comment Share on other sites More sharing options...
moray james Posted March 17, 2021 Share Posted March 17, 2021 it is always a very good idea to take a sharp pencil and scribe a circle on the cone around a dust cap and add a short stroke across the flange of the dust cap and on to the cone so you can perfectly re align it when the time comes, you can also number the dust cap and cone so you know which cap goes where later. 1 Quote Link to comment Share on other sites More sharing options...
dtr20 Posted March 18, 2021 Share Posted March 18, 2021 Please remove the woofer and inspect woofer before removing the dust cap, unless you know for a fact the dust cap is loose. If the inner screen is loose under the dust cap, it will rattle when you shake the woofer while holding it in your hands. If this is the case, get some long tweezers to remove it. If you want to replace it, I put mine in the same area, but in back of the magnet with cement glue. Quote Link to comment Share on other sites More sharing options...
Biscuit Posted March 18, 2021 Author Share Posted March 18, 2021 21 hours ago, dtr20 said: Please remove the woofer and inspect woofer before removing the dust cap, unless you know for a fact the dust cap is loose. If the inner screen is loose under the dust cap, it will rattle when you shake the woofer while holding it in your hands. If this is the case, get some long tweezers to remove it. If you want to replace it, I put mine in the same area, but in back of the magnet with cement glue. I didn't see this until after removing dustcap. Not sure I would have been able to get it from behind though. It had gotten around the dust cap and was against the cone as seen in these pics. Pretty sure this was causing the noise, not the dustcap which had a lifted edge, but did not seem to be completely unglued where the edge was. Question1. Best way to remove residual glue? Question2. Mixed clear epoxy ok for gluing the screen back on ? Quote Link to comment Share on other sites More sharing options...
Biscuit Posted March 19, 2021 Author Share Posted March 19, 2021 I can now confirm that this was the noise. Fixed now. Thanks all for the advice, and input and pics! Quote Link to comment Share on other sites More sharing options...
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