Thanks for the post. Yes, a bipolar does have some applicablity in the world of monopolar boxes and open baffle (dipole) designs. For example, Genesis uses a stereo polar line array woofer stack with a open back dipolar mid/tweeter line array arrangement in a high dollar four box model (they demo'ed this design at the RMAF last fall). A few other commercial speakers use the bipolar concept but they are rare. Too often the bean counters kill multiple driver designs as designers have to compromise what may be a better acoustic solution to satisfy a targeted selling price.

As you suspect, the bipolar solution in my case was an attempt to squeeze as much sensitivity from this driver as I could as it is biased toward low end extension and wide bandwidth. I used the narrow width box and MLTL design to enhance the bass within a small floor space enclosure--more WAF was my goal. The bipolar was intended to handle the baffle step compensation while maintaining the sensitivity as high as I could.

I'll try to hear your new bipolar creation in the near future.

Thanks.

Jim