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In Reply to: RE: Compression drivers used outdoors posted by Coner on February 01, 2017 at 05:12:34
Thanks. This puzzled me, but then I looked up cutaway diagrams... I had forgotten that the 'anatomy' of a compression driver is reversed from a cone driver - so moisture doesn't have to go through the diaphragm to reach the magnet gap.
I might trim the horns down slightly, so I can mount them them inside something I can seal airtight - 200 litre food drums. That would be less trouble than hauling the horns in and out of storage, and should only cost about $50:
"Food grade steel drums
200lt clean food grade feed or storage steel drums. These drums have only been used once and are in excellent condition. They are a open lid drum with a band clip ring. Limited stock."
Mount the drivers in a bag filled with SF6, a heavier-than-air gas available at a welding supply store.
They won't corrode and loses their HF response.
...didn't Dayton Wright enclose one model of their high power electrostats in a bag filled with SF6 (sulphur hexaflouride)? IIRC, this was done because SF6 is a better dielectric/insulator material than an equal gap of air thus allowing higher polarizing and drive voltage. I also recall that those speakers were quite problem prone due in part to leakage of the SF6.
".didn't Dayton Wright enclose one model of their high power electrostats in a bag filled with SF6 (sulphur hexaflouride)? "
" I also recall that those speakers were quite problem prone due in part to leakage of the SF6."
It's heavier than air, so it wasn't that big of a problem.
A little cling-wrap in the throat and seal up the back of the 2445 and you might be fine without the SF6 (I've done that on floor wedges).
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