Those are dipoles where “totally symmetrical front and back openings provide identical response and dispersion patterns. To adjust for different and independent dispersion patterns in the front and back of the driver, a speaker builder can use Raal's proprietary foam deflector pads. In this fashion a speaker builder can add amazing depth in the stereo image, and allow for listening room adjustments. For the first time, you don't need electronics to adjust front and back levels!”
I used first order crossover with Duelund cap.
I used first order crossover with Duelund cap.