Jump to content

Woofer Refoaming


Chip

Recommended Posts

I read that one can use a single battery cell and hook up the speaker observing the correct polarity and the cone will move forward to the max extent. Then apply the new foam to the cone. This way the foam will not cause the voice coil to go off center. Is this correct procedure?

Chip

Link to comment
Share on other sites

This is wrong a couple of ways. You want the surround to be in in a relaxed state, rather than stretched from the cone being way forward, while it dries. You probably couldn't get the glue to stick with the woofer cone that far forward, anyhow, as the surround would be under tension.

If the idea is to keep the woofer centered without a shim I would recommend you glue the inner joint first and let it dry, then glue the outter joint and feed a low frequency tone in with enough excursion (say 1/4" peak to peak). slide the surround perimeter a little left then a little right, then up then down. Find where it just starts to rub in each direction and split the difference. This has worked well for me.

David

Link to comment
Share on other sites

Hey Chip

Don't know what refoam kit you are using. I like MSound. Take a look at the step-by-step instructions here:

http://www.citlink.net/~msound/refoam/

There are 12 pages and it covers everything

Good luck

Kent

Kent, good stuff from MSound, about the best explanation I have found so far. I keep reading the stuff and learn something new each time. No, I did not get my foams from MSound, wish I had but the deed is done. I was surprised at the "insistence" to use shims, I can see the necessity. But others have said it is not absolutely necessary. I am inclined to use the shims.

I have cleaned off the old foam surround off one speaker so far. It was shot, still there but not doing anything except maybe keeping the cones centered. I have acquire some of Aleene's Tacky glue, many recommend it over general "white glue." Though I have a new supply of Elmers acquired at Wal-Mart for a quarter. I am going to stay away from the hexane based glues (I have had some experience with Hexane in high Altitude explosive chambers, dangerous stuff banned in Great Britain). Ace's Wellbond is just another white glue (aliphalatic glue). So is Tight bond which I use on Radio Control airplanes. Tightbond is generally water proof while the white stuff is not, resistant maybe but not water proof. I have lots of glue brushes - I used them with epoxy applications.

And yes, I will dry fit things before I go after it so to speak.

Again, thanks for the encouragement and help.

Chip

Link to comment
Share on other sites

I'd go with the Aleen's. Roy C, who has more experience with these things than I, said he likes Aleen's too. It may be the same stuff that comes with the MSound kit.

Link to comment
Share on other sites

A great alt to shimming is use of 30 hz signal. I have a CD with 30 hz from JBL kit I bought from Rick Cobb. You affix surround to cone. Then as soon as you glue surround to basket you play 30 hz CD to center the VC/cone. It vibrates and you play this for an hour or so while it dries.

Course you have to be set up and ready to go. I usually keep rubbing down the surround to gasket with something blunt like hadle end of exacto knife.

Works like a charm!

Link to comment
Share on other sites

Archived

This topic is now archived and is closed to further replies.

×
×
  • Create New...