BIG OB's

[REC1]

Hi, I do not think MJK's XO will work well with radically different baffles, /sreten.

Sure it will, just goes lower in frequency due to the increase in baffle size and with the Alpha mounted the same (low) will not cause any floor bounce. There is little , if any, U or H frame action so the efficence will be the same. However i simmed a tiny bit of horn action on the rear due to the slight expansion. This can be countered by moving the drivers to near the outside edge.

Roll off (LF), i believe, will be the same. Add some roll foam (pipe insulation) to the top edge and edge diffraction becomes a lesser issue.

ron

[holdent]

Sorry REC1 I did a quick sim of it and I agree with Sretan - the crossover won't work. The larger baffle will bump up the response in the midbass as well. You might be able to get away with it if you start playing with the placement of the woofer on the baffle (raise it up?). Your baffle is radically different, as noted, and a larger baffle doesn't just extend the bass.

[Nelson Pass]

Nothing is going to replace getting some different values of
passive components and playing with it until you are happy. To
get to that you can simply start with Martin's XO values and take
it from there.

[jlharden]

Hey, I think I recognize those big open baffle speakers! They are no longer in use, but they did work very well. I tri-amped the speakers and would bi-amp at the minimum if trying to do this. There are smaller, high quality open baffle woofers you could use to scale the baffle down too, depending on design goals. I can confirm that a pair of towers with 10-15" drivers *could* dominate a room visually. Dynamics and scale seemed to be uncompromised though! Have fun......