The Alpha 10 speaker works well in bass reflex cabinets ranging from approximately 1.0ft3 to 5.5ft3 tuned to 40Hz. It also works well in sealed cabinets of approximately the same size, and in horns of various shapes and back chamber volumes.PiAlign suggests 1.4ft3 tuned to 37.5Hz, which is at the small end of the possible bass-reflex alignments. For the electro-mechanical parameters, you can substitute 1/Qts = Qd.