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Old 7th June 2014
  #7
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There is a thread on one of the HiFi DIY sites.
Not sure if the 150 is exactly 150 liters or an approximation, but using one of the many Thiele Small calculators you could get an approximate tuning.
I do remember, the box is pretty simple not much if any internal braceing. Just a very well built box with minimal damping. Plus they have a schematic of the crossover.