More fun & games (For my next trick)

I'm spoiled. All the sound systems in my apartment are perfect. I am particularly proud of my under-bed sub.
Our garden system sounds good too (an entirely different conversation).

The fun part is that the garden cupboard sits on a pallet.

A UK pallet measures 1200 x 1000 x 130mm - a whopping 120 litres!

Of course I'm thinking SUBWOOFER!!
The 130mm height provides serious challenges but wouldn't it be an engineering coup to design something half decent?
 
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A UK pallet measures 1200 x 1000 x 130mm - a whopping 120 litres!

OK, I'm up for some more fun! 😉

How do you envisage dealing with the gaps?

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standard UK wooden pallet

P.S. On checking the arithmetic, I find that (1.2 x 1.0 x 0.13) m = 0.156 m^3 = 156 litres.
 
The distance from the middle to the corner of the pallet and back, is a half wavelength there. You'll have to take this into consideration especially if it affects your cross.

I'm going for a cross of 80hz.
My current plan: (Long-side to front). 6 x 100 x 400mm ports to front elevation. 4 x 5" drivers opposed in the short sides.
If I use 6mm MDF on top and bottom surfaces, internally the surface of the cabinet is ribbed - I've no idea how that effects waves.
Possibly I could use a full length front to back brace, effectively making two cabinets.