ideal baffle/enclosure shape for OB?

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Is there an ideal speaker shape for an open baffle/cardiod speaker? I will be fibreglassing an enclosure soon so I can make spheres, curves, etc. I was thinking of making a flat front baffle, a half sphere on the back.

What shape would be ideal for baffle diffraction?
 
Is there an ideal speaker shape for an open baffle/cardiod speaker?
Ans: No. It is driver/system dependent. Many Variables.
What shape would be ideal for baffle diffraction?
Ans: Diffraction is mainly a tweeter issue. The least of your concerns when trying to come up with a baffle shape for you midbass!
Suggestions: Research 1st. The bible for OB.
http://www.linkwitzlab.com/frontiers.htm
Also helpful:
http://home1.stofanet.dk/troels.gravesen/index_b/OBS.htm
Make a narrow baffle with wood to mount your drivers, then add cardboard to get your desired shape. Measure. Measure some more. Listen. Build. Measure again. Listen. Enjoy;) .

Cheers,

AJ
 
Thanks for the input John, however, that is not an option. I will be moving in 3 months and will probably move 4-5 times in the next couple of years. I need my speakers to sound good whereever they are... Could a far field measurement be done in an apartment, or would room acoustics cause too much error?

Thanks
Alex Kunec
 
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