PiAlign says...



Using your numbers, Fts=28, Vas=12.49 and Qts=0.24, PiAlign values are Frd=28, Vad=12.49 and Qd=4.17. PiAlign suggests making a 3 cubic foot box tuned to 44Hz. For a bass-reflex cabinet, actual dimensions are 26" x 18" x 12" and with a rectangular port having inside dimensions of 3 1/2" x 6 3/8" x 5 5/8" long.



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