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So what exactly was so special about the Intersonic Servodrive?

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Danley designed the servo-motor-drive concept?

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Danley make some very impressive gear. The tapped horn concept is not their own but they've made it work really well in practice thanks to thorough design and drivers that make full use of its benefits. Here's how it works: [Invalid or Expired Link Removed]

Their other thing is the Unity Horn which is their own concept - it uses multiple groups of drivers, all appropriately bandpassed, firing through the same unique geometry horn to produce a (near) point source. Check out this monster:

http://www.danleysoundlabs.com/products/loud-speakers/jericho/jh-90/

720lbs, six 18"s, six 6"s, 17000W, 148dB SPL continuous.