transmission line?
it kind of looks like a speaker I've seen out at DIY Audio Projects; except its path is to the rear.
http://diyaudioprojects.com/Speakers...FX120-ML-TQWT/
Integra DHC80.1,3x 4636LF, 2360-2446J 2404H,12 x 8340 Surrounds, 2 x4645B, BGW 250D's,250E's,& 750B's 16 amps...7600 watts
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