OB diffraction - rounding both side?

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I'm planning on having the neo3/neo8 in a 2" thick OB. I know it helps to round off the front facing edge of the OB to deal with diffraction, but how about the back one? Is it more important to smooth out the rear of the driver hole?

Also - is there any software the can model a combined sealed woofer with an OB mid+tweet arrangement?
 
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