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In Reply to: Ultimate outdoor speakers......pair of Dynaco A 25's posted by audiogatorjim on April 19, 2007 at 23:11:10:
The woofer surrounds on those are usually rubberized, should last a long time, as long as the speaker cones don't absorb the moisture.
Tha best "real" outdoor speakers I have heard are the Bozak Bards. Meant to be floor standing, the barrel looking speakers use a little metal coned, flat faced 8 incher, but do sound full range. Its' aluminum cone is quite fast in transient response, too.
Maybe, since you have decided to "sacrifice" the Dynas, you might want to lightly coat the cones with rubber cement. That stuff is very flexible and never hardens. It should add years, or at least months, to your outdoor "test."
Follow Ups:
I once applied a light coat of rubber cement to the woofer cones on a small 2-way system. This was recommended by a known audio tweek "guru". Well, it changed the sound alright, but not for the better. Luckily, rubber cement can be removed (or at least 90% of it, except whatever liquid was absorbed by the paper cone). Perhaps because this was a small driver it didn't take much mass to change it's operating characteristics but it became dead and slow sounding.
I know a lot of the "full range" driver guys use various varnishes that don't add mass. Some are quite expensive but others are not. Try the high Efficency Asylum.
Yes, Good Point ! Apply too much, and mass changes, possibly slowing down bass speed.
On the other hand, a light coating of rubber cement, on tender woofer surrounds, can enhance power handling and bass control.
This certainly is speaker dependent...and this thread is about Dyna A25s and outdoor speakers.
Dynas have a nice rubberized surround. If he wants to keep them outdoors, what can he coat the woofers with ? A light coat of rubber cement is certainly better than gasket cement or silicone goo, right ? How about silicone spray ? That might even be lighter !
By the way, rubber cement is THE accepted repair cement for vintage speaker rips and tears...In this case, silicone spray is sounding better(cool pun, huh ?)...
was I bought what was supposed to be a pair of Dyna A 10's for my office system. The seller didn't know what he had and sent these A 25's. I already had a pair. So, I removed the pair of small Advents that were outside and replaced them with the A 25's. The Advents are now on my desk.My wife loves the A 25's and you cannot see them as a hedge conceals them.
I have found that 3M Scotchkote makes an excellent very thin pliable coating. It is found in the electrical department at Lowes and is a very thin liquid latex used to seal electrical splices. You can put it on as thick or rather as thin as you want. I once painted a little on a piece of paper towel and was amazed at how tough yet flexible the combination was. Good luck.
Gary
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