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I've dragged my brother's OHM C2 speakers out of the garage to use them again (after 25 years) and the speaker foam has all perished.Does anyone have any experience of replacing it yourself using one of these kits?
http://www.simplyspeakers.com/ohm-speaker-foam-edge-repair-kit-fsk-10f.html
Regards
Barry
Edits: 05/22/16Follow Ups:
Easy as pie. So far this revelation (how easy re-foaming is) has allowed me to buy great speakers at ridiculously low prices... $15 for the pair of A70, $20 for a Pair of Infinity RS-225, and less than both of those for a pair of Polk Monitor 4. Add $25 bucks to each speaker and all six have cost me around $40 a pair.
There are tons of videos on youtube showing just how it's done. Mny times you can even find someone doing it to the very same pair you have. I know the Polks and the Bostons were both there.
The toughest part is removing the glue from the original surrounds but even that is really easy. It takes me about 30 minutes to clean up a speaker. Then about 10 minutes to apply the glue to the inside lip, then wait an hour then apply to the outside.
I never have bothered to remove the dust cap to shim the voice coil. So far after doing six of them, I haven't had any issues with the voice coil rubbing. I just make sure to lightly push down on the cone during the glue-up of the outside edge making sure nothing rubs. If you are concerned about that, there is a way to center the voice coil using a tone generator on the iphone. But I have never used it.
The annoying part was scraping ALL the old stuff off the cones (plastic) and the basket.
Then, laying the speaker flat (o the cones would self center) gluing the foam to first the cone only, letting the basket edge place the still slippery new foam centering it before the rubber cement dried the foam to cone.
Then the glue to basket was a breeze.
This as well before rubber cement became labelled as toxic.. So I have no idea how well the current glue works.
I replaced the foam surrounds on a pair of Audio Note AN/J's a few years ago. Its not difficult if you are patient and take your time. As with most things the first time you do it the first one took a bit of time and the second one went much quicker. I used the instructions from Audio Note linked below and they turned out great.
A few tips:
Make sure you clean off all of the old surround residue. I used a putty knife and a razor blade. Work slowly and carefully. I recommend using poly-acrylic latex speaker glue as it is water soluble and slow setting. Apply the glue and spread it evenly on both surfaces to be glued. Attach the surround to the frame first and then to the cone. As the glue is slow setting, the surround can be re-positioned slightly if it is not perfectly positioned when it is joined to the frame and cone. You should be able to line up the inner edge of the surround in the same position on the cone as the original surrounds. If it is not exact to the millimeter don't worry. The tension of the surround on the cone will position itself and it may be just a bit off from the originals. After it has been glued in position for a couple of minutes, very gently press the cone with even pressure toward the voice coil. You should not hear any rubbing if the surround has been positioned properly.
Another method is to record a 30 hz tone to play through the speaker while the glue is starting to set. Play the 30 hz quietly and listen for any strange buzzes. Glue hardens slowly so you can lightly heat up the surround with a hair dryer pushing the surround down with finger or suitable tool if you need to re-position. Once the surround is firmly attached play the 30hz tone a little louder so the cone moves approx. 1/8" and listen again if the sound is clean. If there are some rubbing noises you can still fairly easy stretch the surround a little. The cone tends to align itself very fast. After a couple hours when glue hardens more test it again and if all is good leave overnight to dry completely.
Thanks for all the advice, I really appreciate it.
Its pretty easy. Ive done a few and the first ones were fine and I got better each time.
ET
I have done several EPI and Advent speakers. It is not difficult and the results were good. There is lot of information about this at Vintage.
thanks - I will have a look
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