Baffle design

[ldarieut]

Learning bits by bits how to make a simple two way loudspeaker (15'' woofer & 1.4" CD + horn).
I have the box design covered with the great tutorials from the pinned thread (volume, ports, frequency...etc).

I don't know where to start with baffle design though: where to place the woofer, what distance should it be from the edge, what distance should the horn be from the woofer, etc...

Here is what I think I know so far:
If I let Fmax be the maximum frequency I will use the woofer, the distance between the edge of the woofer and the edge of the box should be 1/4 of the Fmax wavelength. (for instance, ~10cm for 750Hz)
I should round the edge to minimize diffraction.
The Fmax should be where the directivity of the woofer starts to diverge to get a nice transition with the horn.
On the other hand, I have no idea what should be the distance between the edge of the woofer and the bottom of the horn.

Thanks
luc

 

[Face]

It's hard to go wrong by having them as close to each other as possible. To go a step further, you can model the effects in The Edge or Jeff Bagby's Diffraction and Boundary simulator.