150 HZ Tractrix contour

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I have been tosing around the idea of a Tractrix contour for a midbass like the one in this website http://www.volvotreter.de/pics_plans.htm
has anyone out there tried this set up ? would it be possible to have it cover the entire volical range say 150 to 3500 HZ. then cross over to a small saliad bowl horn? what would be a clean driver for the 140 hz horn? or is the EV EVM 12L driver the best to use ?
please give your in put thankx
 
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