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If the biggest subwoofer in the world (see previous item) may have seemed to daunting to duplicate, there's these infinite baffle guys who use a modified approach of possible interest. About a year or so ago, _audioXpress_ did a series on infinite baffle testing. This IB forum shows some actuall applications of the theory. Infinitely Baffled
I like the idea of IBs but would only bother implementing it if i could afford the drivers! i mean quality drivers,not crappy non shorted ring car ones :-)