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In Reply to: RE: Vintage speaker driver coil "sag"? posted by huubdas on June 14, 2015 at 15:31:28
The rubber in old Philips woofers got hard and split.
Older loudspeakers from Infinity, Dahlquist, etc, are hard pressed to find replacement midrange drivers, and I know of no source for replacement surrounds.
Follow Ups:
PhilipsAD 8066 and AD 8061 all as new. I collect them, very good woofers for all purpose. The rubber surrounds on Wharfedale woofers become stiff, not fitted to collect. Alway's a gamble those surrounds, renewal pain in the *** regarding alignment.
Perhaps you talk about later, 80-ties, 90-ties ? Indeed not good anymore.
Anyway I KNOW there is perfect material for surrounds at hand so why manufaturers use lousy foam and lousy hardening rubberlike stuff ??? Even in expensive loudspeakers ???
The speakers I mentioned are mid 70's vintage and used the AD5060W8.
Edits: 06/15/15
Thanks for the photo.
Obvious a foamy rubbery surround.
I only know about the AD 8061 and 8066 types, 30 of them, all as new, can you tell me what material it's made off ? Everlasting, no crackles, no sweating, no hardening. Did Philips keep it a secret ?
The AD 7063 with impregnated cloth surround hardens, later types , f.e. digital series have quickly deteriorating surrounds, sticky after a few years. Old sixties harmonica surrounds, treated with silicon or not are also lasting forever, A 4201 M for example.
Anyway a good material is a choice the manufacturers make, but I think they don't WANT to make everlasting loudspeakers but sell updates every now and than. So, expensive, cheap or whatever is a gamble, minimising this gamble is chosing for silicon rubber what I think the 8061/66 is made of.
The nice looking surrounds of the Dali 606 bass/mid units are still very flexible when pushed with the finger, after 12 years, so also good ? Looks like solid (silicon ?) rubber.
Once in a while I build enclosures with the Philips units and gave them to friends and neighbours and they still are in use sounding as when I finished them. The 8066 are easy obtainable on Marktplaat/E-bay, also from the bin, alway's as new, it is my favorite loudspeaker as you can understand.
Huub from Amsterdam, the Netherlands.
The longest lasting surround material is treated cloth. The accordion surrounds on pro woofers lasts a long time, many still fine after 60 or more years of use.
The surrounds on my Wharfedale W90's are fine.
Dave
I refer to the Wharfedale Glendale.
Rubber (?) surrounds look as new but dried out and rather stiff.
Resonant freq much higher than ought to be.
If surrounds become stiff a nasal sound results.
W90 could be better, I don't know what type of surrounds they have, if sounding oke you're a luckey guy.
W90's are from the late 50's/ early 60's. I think it is quite a different animal.
Dave
Crazy,
Up to the sixties almost no problems with 12 inch harmonica surrounds, for high fidelity the best solution, fullrange or woofers.
Problems began with smaller woofers, small boxes that made longthrow, low res. necessary, roll surrounds became fashion. Problems until now !
Depends on the treatment material.
I've had Monacor and some automobile speakers, the treatment material became very hard, I think it was a PVC treatmenr.
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