What box is this? Help me identify please

Hi. Someone know what cabinet is the one in photo and maybe share with me the plan so i can build one? Thank you in advance.

Schermata 2023-07-03 alle 11.51.21.png
However, this is a potential help (maybe? or a lesser offset aimed at the next resonance) to get rid of the second resonance in the front side pipe and prevent an annoying result (like some of the paraflex models overexcite multiple pipe resonances in that area )?


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