The tweeter is horn-loaded, not the bass. The bass loading is a variant on the “double chamber reflex” system. The earliest note of this comes from P.G.A.H. Vogt, but it has been somewhat popularised by Augspurger (USA) and by Kondo & Nagaoka (Japan) especially for smaller wideband drivers.
Are the LS 3.5 horn loaded?
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