How to fix a 'blown' loudspeaker with coil rub
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- เผยแพร่เมื่อ 21 ก.พ. 2017
- How to fix a speaker with coil rub, where the voice coil comes in contact with the magnet. This is often the case with speakers which have sat for extended periods (decades or more), causing the voice coil to droop into the magnet. In my case, the magnet had shifted after dropping the speaker and began to rub.
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In many cases the the surround or spider has sagged causing misalignment and rub. As well as the fix shown here (a good fix BTW) you might find that mounting the speaker in another orientation will equal-out the sag or distortion. Commonly with front mounted speakers like shown here, you can rotate them 180 degrees and the coil alignment will improve; reducing or eliminating rubbing.
i shall try that!!! great idea!
If I rotate it 180 degrees, how long would you recommend leaving it upside down?
That's what I was going to suggest, just turn the speaker upsidedown first & see if that stops the rubbing.
You absolute legend!!!
Monitor audio gold 10 speakers worth a lot of money, one was crackling, I watched this video, realised it was rubbing in the middle like yours, a little fidget straitened the center of the cone boom 💥 worked like a dream. Thank you so much !!!
Just tried it on a 1950s alnico 12” speaker. It worked. This guy is a genius. Thanks, SIR!!!!!!
Clever fix. I have a Pioneer 12" for my car and it started making a lot of noise. I've heard that it can be from subs sitting facing outward like most home speakers are. Ideally, they face up or down in vehicles and in home theater situations (down-firing being the best in most cases) but that's not always possible with most home setups. The heavy use combined with an outward-facing stance can cause the coil rub. You'll know it's coil rub if you can increase the volume output on your sub and the noise doesn't get proportionately louder (it may get a bit louder from more vibration but it's not nearly as audible at high volume as it was at low volume).
One way I semi-fixed my coil rub (for the time being) is by standing it upright and letting it play. The coil rub went away for the most part after about 30 seconds of playing music through it. I've seen people use rubber bands to wrap around the coil behind the speaker and create moderate tension by wrapping it around and anchoring it. When you lightly pull it in the correct direction it removes the contact between the speaker and the coil(s) and you get the same effect. However, I'd recommend the way TeDubbs goes about it because that's closer to a permanent fix.
Bro I just got a 10" Memphis Sub and it's the same as yours! It makes a noice when facing sideways buy when facing up it's completely fine! I'm scared I might have a bad sub or something any tips on what to do?
Thank you for making this! Mine didn't have screws and I needed to pry and wedge it back into place. This video helped conceptualize the problem and solution for me.
Those speakers look well built
If the back plate is glued you can heat the plate up with a hair drier and GENTLY tap the plate into position so don’t rub. Worked for me.
how long did you have to put the hair drier on it, i just tried it and the plate wouldn’t move at all
@@wiltuckerr not long. Till it got hot
@@wul01 didn’t work for me unfortunately idk what to do
THANK YOU, my issue was slightly different (but also a dropped speaker) since my speaker is smaller and no allen bolts to loosen ( it has glue instead) but when you mentioned the magnet, and loosening it, I noticed it wasnt looking straight, with a little bit of bending it seems to have completely stopped rubbing and works great.
Thank you! Someone gave me some Boston Acoustic tower speakers and one 7" woofer was doing exactly this. Looked and saw the magnet was bent off center. A little leverage with a screwdriver on the housing and -- boom! -- good as new! Thanks, mate!
thank you mate you have saved me a fortune
Thanks for your video, I just fixed my F121 Funktion One Driver, after it was dropped side way and the coil rubbed ..I saw your video after I have already order a re-c0ne kit but guess it can sit in the drawer as a spare now that my F121 is firing away again. Great video .thx
Top job. Thanks heaps. Cheers from Australia 🙂 👍👍👍
Thank you this video helped
Good video.
Thanks for the info.
About to try this on the speaker for my bass amp. I'll let you know if it worked
Dude you're fucking awesome. This is exactly the issue I'm having and it was gonna cost me 250$ for a re-cone. Gonna try this immediately. Thanks... Wish me luck!
That would be awesome if it works! Let me know how it goes...
Unfortunately it didn't. :( You're idea is still great, the speaker I need to adjust doesn't have a way to loosen the magnet though. Going to have to re-foam the suspension and re-center it. After checking it out, speakers with this problem DO NOT need a full re-cone. They just need the foam surround replaced and re-glued to where they're centered correctly and don't rub. Word to the wise. Kinda pissed at my speaker "guy"....
subbed...idk if this question is related or not but would a coil rub show a different impedance than normal?
Dac Watt No, unless the coil is damaged
Fixed a peerless p835037 10" out of a Neumann kh810 sub this way. It must have been dropped during shipping and the basket moved
do you know if this works with coaxial speakers?
What do I do with these Denon’s that have a goddamn frame around the voice coil?
my magnet doesent have any screws i think it's glued
Could this happen to a car sub? mine sounds very similar to that one and is quite annoying to hear. would it be better to buy a new one as I only paid like $30 for the entire woofer.
I could happen, sure. Nothing wrong with just buying a new one if that's what you want to do but remember that you've got nothing to loose by taking it apart at this point if its not working properly. I would say give it a shot, you'll learn something new :)
Ugh... idk if my first comment went through...
Hopefully this will work on extremely old speakers too. I’ve got an old zenith radio tabletop that I patched but still sounds blown. The speaker is already fragile enough since it’s old paper...
My speaker that rubs sounds more clear than the one that’s smooth any idea on why that is?
Hell to the yeah
I'm working on a 5 inch driver with coil rub. The permanent magnet doesn't have any bolts. Hmmm
😢 I don't understand English can someone write me the procedure? I too dropped my speaker... Thx!
also, what the hell is up with these negative comments lol
You sound smart but please stop saying basically
Great contribution, Emilio.