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On this page you are able to calculate a speaker enclosure with Thiele/Small parameter. The colors of the curves in the diagrams for frequency response, step response, group delay and voice-coil impedance have the following meaning:
Black: Vented-Box with Thiele/Small-Parameter (Bullock alignment).
Blue: Closed-Box (without filling material) aligned with Thiele/Small-parameter and a desired Qtc.
Red: any construction of your enclosure using the same Thiele/Small-parameter. You are also able to calculate a Closed-Box if you make the value of the vent diameter very small (i.e 0.01).