7" midbass and 1" tweeter for 60$ and 30$, what about SEAS?

[Bricolo]

I know the tool

[crazyhub]

So use it...and don't oligatory agree with your quote "But in practice it usually is quite a bit difference..." lol assuming that my purpose in this mater was to point out that the width of your baffle has to be calculated to not create a bump at the 3rd HD peak...you could even create a little dip at this fr.
Good luck.

[Bricolo]

well, if the H1 is constant at this frequency, I think I'd better try to have it flat. At least as a start.

If the project starts soon enough, I'll still have access to the tools to measure the speakers (TS parameters, frequency response, distortion, non linear parameters...)

[crazyhub]

My guess is that if you don't manage this 3rd HD you will hear it. But yes, proof is in the listening and measurements.