Unless this is different, ring radiators are several decades old.
Kal
Kal
Ring radiator tweeters - the future?
A technology developed by Scanspeak that hasn't penetrated the audiophile market, but Polk started using them - and their fans say it produces better high end within the same price range. A brief froogle reveals JBL offers them as components. Could this technology end the perpetual silk dome vs. titanium dome debate?