I’m in the process of redoing the surrounds on some old 1973 Sylvania AS-225A woofers. They’re Rola/Celestion 12”. I picked up four of these speaker cabinets for $25 us, the other drivers and cabinets are solid, just need some oil on the walnut veneer. Hope they sound good when I’m done. I’m not out much….
Interesting! I like speakers. I used to take them apart for the magnets. (Not good expensive speakers of course). I never had the opportunity to rebuild a speaker. Which I know requires great skill.
Altec 305 most likely. 200mm diameter cone. Looked everywhere and as far as I can see, all the foams sold out there supposedly for the 305 are for smaller cones and don't fit ... 194 or 197mm. I've tried 197. Nope! There are some larger foams for 203mm cones (sold for KEF woofers) but they don't have enough inner diameter to provide a decent overlap for glueing.
Reading comments below, it's simply a matter of what your used to using=especially if you do it on a regular basis. I prefer the white speaker glue (basically Aleene's tacky glue in the brown bottle) as I have all the time in the world to work with it. Had nothing but excellent results that way. I've also used the black silicone based glue which sets up FAST so just be ready for that and if your any good you'll get it right :)
I have a Mirage Omnisub 10" I had to repair. Aluminum cone and a heavy rubber surround, not foam. Puppy wrecked the cloth grille and put a hole in the surround. Rather than try to find a replacement, I slapped some gorilla tape over it and used silicone sealant to make it airtight. Not quite as flexible as the good part of the surround but it doesn't seem to affect it much down below 80 Hz, which is where I have it crossed over.
I’ve done quite a few of these including JBL ads and pioneer. Pretty difficult to avoid getting blue on the foam. The finished product looked good to me
The best way to get glue all the way around evenly is you put power to the speaker not much, it will raise the cone and you can get the glue spread evenly then disconnect the power the cone drops and nice contact all around!
That woofer has a 1989 mfr date FYI. Would love to know what model this came out of. Ive refoamed eight of these things out of 2 seperate sets of towers (model 501 & 512). Loctite clear multi-use glue worked best for me. Being its a single woofer, was this possibly from the model PSW10 sub? Either way, restoration well worth the $. These woofers sound amazing against anything modern and thats impressive given the modest size magnets and stamped baskets.
I am sure that they apply the glue and foam to the backside of the cone before the voice coil, spider, cone is installed into the basket at the factory. I have refoamed a set of Pioneer DSS-9D 12" woofers with the foam attached to the rear of the cone. You just can't see well when doing a refoam this way.
you really should have pulled the dust cap and shimmed the coil, there's no need to play a sine wave during a repair,the glue allover the foam was indeed avoidable
I’m in the process of redoing the surrounds on some old 1973 Sylvania AS-225A woofers. They’re Rola/Celestion 12”. I picked up four of these speaker cabinets for $25 us, the other drivers and cabinets are solid, just need some oil on the walnut veneer. Hope they sound good when I’m done. I’m not out much….
Great job.
Interesting! I like speakers. I used to take them apart for the magnets. (Not good expensive speakers of course). I never had the opportunity to rebuild a speaker. Which I know requires great skill.
It didn't take you long to fix that, great another saved speaker 😀
Altec 305 most likely. 200mm diameter cone. Looked everywhere and as far as I can see, all the foams sold out there supposedly for the 305 are for smaller cones and don't fit ... 194 or 197mm. I've tried 197. Nope! There are some larger foams for 203mm cones (sold for KEF woofers) but they don't have enough inner diameter to provide a decent overlap for glueing.
Reading comments below, it's simply a matter of what your used to using=especially if you do it on a regular basis. I prefer the white speaker glue (basically Aleene's tacky glue in the brown bottle) as I have all the time in the world to work with it. Had nothing but excellent results that way. I've also used the black silicone based glue which sets up FAST so just be ready for that and if your any good you'll get it right :)
I have a Mirage Omnisub 10" I had to repair. Aluminum cone and a heavy rubber surround, not foam. Puppy wrecked the cloth grille and put a hole in the surround. Rather than try to find a replacement, I slapped some gorilla tape over it and used silicone sealant to make it airtight. Not quite as flexible as the good part of the surround but it doesn't seem to affect it much down below 80 Hz, which is where I have it crossed over.
Thanks for sharing this with us. It looks so easy in this video but I guess you have to refoam quite a few speakers before you can do it that fast.
I’ve done quite a few of these including JBL ads and pioneer. Pretty difficult to avoid getting blue on the foam. The finished product looked good to me
How does one get the cone separated from the old foam without damaging the cone?
The best way to get glue all the way around evenly is you put power to the speaker not much, it will raise the cone and you can get the glue spread evenly then disconnect the power the cone drops and nice contact all around!
Nice work, thanks
That woofer has a 1989 mfr date FYI. Would love to know what model this came out of. Ive refoamed eight of these things out of 2 seperate sets of towers (model 501 & 512). Loctite clear multi-use glue worked best for me. Being its a single woofer, was this possibly from the model PSW10 sub? Either way, restoration well worth the $. These woofers sound amazing against anything modern and thats impressive given the modest size magnets and stamped baskets.
I am sure that they apply the glue and foam to the backside of the cone before the voice coil, spider, cone is installed into the basket at the factory. I have refoamed a set of Pioneer DSS-9D 12" woofers with the foam attached to the rear of the cone. You just can't see well when doing a refoam this way.
You are using the wrong size foam, look at the cone all wrinkled up.
Why use foam again instead of rubber
you really should have pulled the dust cap and shimmed the coil, there's no need to play a sine wave during a repair,the glue allover the foam was indeed avoidable
Stick to troubleshooting that Refoam was an Abomination! Shoddy work man!
First!
Would work better if your glue wasn't dried out