download a box simulator (Unibox or Winisd) and learn to use it... it not hard and you'll have hours of fun playing with it....
I am frequently amazed that my fellow contributors try and reinvent the wheel. If you go to Troels Gravesen in his prime, you will find he did the SEAS CA18RLY to death! 😀
16L or 24L reflex seems to do the bass trick. I have often enough visited the SEAS factory in Moss, Norway to see what these fine people do.
TBH, a driver with a Qts of 0.47 is saying closed box to me, albeit in the measured Vas of 32L. H1217-08 CA18RLY
But if you can accept a slight bass bump for a smaller box reflex, that's OK too. 🙂
The whole bass thing is explained here:. Arpeggio Loudspeaker - diyAudio.
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very interesting article, thank you!
using 5 cm thick polyurethane panels on each side, does the apparent volume increase or have no influence?
It can't, until you also include driver Vas, Fs, effective Q (Qts + any series resistance in the circuit from wire, connections, series inductors &c.), and the box tuning. Once you've included those: then you can calculate the mathematical anechoic response of a vented box (not the same thing as a traditional bass reflex).