Bose Cannon

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I've been looking over the archives on the subject of the "Bose Cannon" sub woofer. Has anyone tried appling the concept of the Karlson Coupler to the ends of the cannon to smooth out any ripples etc in the freq responce. I would think that It would be usable with ether the straight or the folded types:idea:
 
Here is the response curve for the AWC_SUB.pdf file above. It is modeled in Akabak. This is with 10 watts RMS @ 7.4 ohms Re.
There is also a 4th order Lowpass filter @125Hz in effect.
 

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