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Time for some crow on PSW. Check out the radial. Same concept, on front of speaker. From a very good post in the thread that goes on and on. http://www.voltloudspeakers.co.uk/About_Us/about_us.html
Yes, that's good stuff. I think the Eminence Kilomax series does something similar, with a heat sink placed in front of the driver in addition to air cooling. Seems like I saw JBL was doing something like that too in their latest drivers and a few other companies are using this technique as well. What I've done is to design the cooling plug as an add-on part to be used as an upgrade for existing speakers. <br(.*)