From the drive there is frame resonance (principally from the HF drive), and from the cabinet there is case resonance. The diagram implies there is a short wavelength waveform travelling almost like a skin effect from the tweeter. Is this intended to indicate the drive frame resonance?

With tweeters face mounted on the baffle, could the drive resonance not be better deflected by a stubby cone fitted around the drive or rebating the drives?

As my own DIY's were deliberately built with extra thick mdf and chamfered on all edges to reduce and mitigate cabinet edge resonance, and the flush faced drives filleted in rebates to deflect drive frame resonance, I thought I had dealt with all the possibilities.

And no, I am not putting them into the bath to double check..........