Don't look at me! The Fenlon boxes were designed by Mark Fenlon, not muggins here.
I wondered about that as my one? private 'conversation' strongly implied otherwise.
They're basically off an alignment that Mark favours; I didn't back-calculate the Vb, Fb to figure out exactly which, but I assume it's a Small max-flat vented or one of the near equivalents. Basically done as simple boxes with no refinements to give people new to DIY something straightforward to try. The only real design input I had into these boxes was suggesting a position ratio. The other vented boxes on the MA site are mine though (really should re-do some of the older sketches, not that the recent ones are great, but a bit better than some of the previous types) so the blame for those lands here. 😉
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Ok ill take your word for it.
What does that mean?, Should i change something about the original blueprint?
Right.
It just means the driver & vents are approximately at / near a point I suggested would suit what Mark was trying to do with these boxes.