Designing crossover for good power response

[AllenB]

It looks as though someone has calculated it backwards but I can't know for sure.

 

[mbrennwa]

I was being told by someone that there would be a suckout at 1400hz, but this baffle simulator, configured to the SCM20's dimensions, shows a boost of 2db at about the same frequency. Was I advised improperly?

I don't see how/why there would be a "suckout". The transition from the 4pi to 2pi operation is usually not smooth for a typical rectangular box, but I wouldn't call the wiggles a "suckout". Modeling the wiggles accurately is challenging, and I don't think it's very useful as they would only be heard in an anechoic room.

Am I doing anything wrong?

You have too much confidence in the model 😀
(Yes, I am joking. Models can be useful, but it's useful to understand their scope and limitations.)