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Refoaming woofer drivers #5311385 01/02/20 07:20 PM
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Papa Bear Offline OP
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I came by a pair of old Allison AL-120 speakers a while ago that had deteriorated woofer surround foams.
I removed the 4 woofers and cleaned up the cones & baskets. The new replacement surrounds arrived today from SimplySpeakers.
I have glued the 4 foam surrounds to the cones this afternoon and they are curing/drying. Soon I will be aligning and gluing the foam to the baskets.

Anyone else here rebuild speakers?
I've never done this before. May be a new career move (at 75 yrs old)


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Re: Refoaming woofer drivers [Re: Papa Bear] #5311391 01/02/20 07:27 PM
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Quattro Pete Offline
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Heh, I have plenty of speakers, but none of them old enough to need new foams. I think my oldest are PSB Alpha B bookshelves that I bought in 2006, and a 12" SVS cylinder sub bought around the same time.

Any pics of your speakers and the refoaming process?


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Re: Refoaming woofer drivers [Re: Papa Bear] #5311394 01/02/20 07:29 PM
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Propflux01 Offline
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I have done that before. Saved an older set of JBL 8 inchers. Once you glue down the cone to the basket, immediately run music through them while they dry, and that will help align the voice coils so they don’t bind on the magnet


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Re: Refoaming woofer drivers [Re: Papa Bear] #5311402 01/02/20 07:42 PM
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AVB Offline
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I have done one pair. The foam kit I ordered came with a cd to play at low power to keep the coil centered. I think it was like a 40hz test tone to keep it from moving too fast. It also came with clear plastic shims to center the voice coil, but you have to remove the center cap to use them.

Last edited by AVB; 01/02/20 07:42 PM.
Re: Refoaming woofer drivers [Re: Papa Bear] #5311404 01/02/20 07:43 PM
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sloinker Offline
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Just follow the instructions and space the voice coil evenly. Make sure you are at the null point when you glue the circumference. The new foam is stiff enough to pull or push the coils so be careful. I haven't tried the playing music on uncured glue trick.


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Re: Refoaming woofer drivers [Re: Papa Bear] #5311416 01/02/20 07:51 PM
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AVB Offline
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You don't need the music to be loud enough to hear, just enough to make the coil center it's self. Using a battery may be even better because it would hold the cone stationary. I am not sure how many volts you would need a 2 AA holder from lowes or home depot should work and not over heat the voice coil.

Re: Refoaming woofer drivers [Re: Papa Bear] #5311470 01/02/20 08:31 PM
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I just refoamed my old Rockford Fosgate Punch HE2s which are almost as old as I am. I'm 18 now and I ran them as my first system when I got my car at 16.

I bought them at a garage sale still NIB with my lawn mowing money for $10 back in (IIRC) 4th grade, my dad and I built a box together and put them in his truck and he ran them until he took them out because he needed extra cargo space and never put them back in.

I ran them until the foam totally just crumbled to nothing during the summer of 2018.

Between my love for old-school gear and the background story these subs have I couldn't let go of them.

About a month ago I found a pair of new-old-stock foam surrounds on eBay and with a lot of clothes pins, some cancer-glue, and an xacto knife I refoamed both subs and currently have them running on my home theater receiver.


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Re: Refoaming woofer drivers [Re: Papa Bear] #5311522 01/02/20 09:12 PM
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Papa Bear Offline OP
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2 photos:
1) Woofers removed (notice one faces forward and the other backward) and cleaned
2) Woofers with new foam surrounds glued to cones and curing

These are heavy, well-built speakers that are just too good to let rot. Lots of packing and HEAVY crossover networks.


[Linked Image]
[Linked Image]


2016 Dodge GC Deep Cherry 5W-30 Dino
2013 SYM Wolf Classic 150 T4 15W-40
2009 V-Star 250 Black Cherry 20W-50 Dino
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Re: Refoaming woofer drivers [Re: Quattro Pete] #5311525 01/02/20 09:14 PM
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Papa Bear Offline OP
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Originally Posted by Quattro Pete
Heh, I have plenty of speakers, but none of them old enough to need new foams. I think my oldest are PSB Alpha B bookshelves that I bought in 2006, and a 12" SVS cylinder sub bought around the same time.

Any pics of your speakers and the refoaming process?


Pete:
I figured out how to post pics thumbsup


2016 Dodge GC Deep Cherry 5W-30 Dino
2013 SYM Wolf Classic 150 T4 15W-40
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https://www.hogsforhospice.com/
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Re: Refoaming woofer drivers [Re: Papa Bear] #5311541 01/02/20 09:22 PM
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Quattro Pete Offline
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Originally Posted by Papa Bear
Pete:
I figured out how to post pics thumbsup

Very cool. Thanks for sharing! thumbsup


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Re: Refoaming woofer drivers [Re: Papa Bear] #5311595 01/02/20 10:09 PM
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Found a pair of heavy speakers in the ditch a couple years ago and connected them to an old Kenwood car radio and they sounded fine. After reading the previous posts am fired up to replace the mostly missing cones. Believe they fell off somebody's moving truck.


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Re: Refoaming woofer drivers [Re: Papa Bear] #5311836 01/03/20 07:31 AM
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ET16 Offline
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Have you looked at the crossovers? Upgrading the capacitors can really improve the sound sometimes.

Re: Refoaming woofer drivers [Re: Papa Bear] #5311858 01/03/20 08:07 AM
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Yes if they are really old and they used electrolytic caps you might consider replacing them as they dry out over time. No need to go crazy with quality here but any NP electro cap from an audio place (Parts Express, Madisound) would work.

The metal film (mylar or Poly) caps last forever so no need to replace them.

Re: Refoaming woofer drivers [Re: Papa Bear] #5311860 01/03/20 08:10 AM
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Re: Refoaming woofer drivers [Re: ET16] #5312905 01/04/20 09:06 AM
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Originally Posted by ET16
Have you looked at the crossovers? Upgrading the capacitors can really improve the sound sometimes.


You may be on to something .....
I got the 4 woofers done,installed in the cabinets and ready for their first road-test. It was then that I found one of the tweeters intermittent and suffering from exactly what this gentleman found with his speaker
https://www.youtube.com/watch?v=okaZeSYzctA
My refoamed woofers appear to be well centered and quiet in their excursion yet muddy in their sound reproduction in some passages - both tweeters are working now.
The speakers aren't performing up to par and the cross-overs would be the next circuit to examine .......

[Linked Image]


2016 Dodge GC Deep Cherry 5W-30 Dino
2013 SYM Wolf Classic 150 T4 15W-40
2009 V-Star 250 Black Cherry 20W-50 Dino
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