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Since I've been writing about US Patents . . . Please consider the bass horn shown in the Klipsch Papers i.e. Bell Labs' Symposium. I shows up in US Patent 1,970, 926 titled "Sound radiator" to E.C. Wente and assigned to Bell Labs. (It is likely the same IMHO) It seems best charactized as a giant re-entrant horn (like a bull horn) in a box. It does not seem adaptable to home construction. But take a look. It claims 300 to40 Hz with a 5 square foot mouth and 3' 8" depth. Stackable.
'Good Night, WMcD
4 x 8000f's and a KV4. Al run off Adcom 200 watt per channel amps. I am about 16 feet from the center channel and the room is 22 foot wide. Listening area wide though is about 14. Got 2 more channels ready at 200 watts for the rear surrounds.
Sparecantilever with needle for the Virtuoso are available here w/out any problems for 256 € Performer Needle grind , or 440€ for the Artist Needle grind. I´m suprised that Clearaudio as german manufacturer is known worldwide
@Chief bonehead ... I know this is probably outside of your dept, but does the 'motorboard' on the new Flexus subwoofer act as a lens of some kind, for phase or directionality, even though the frequencies are omni-directional, or are they merely esthetic?