SpeakerBoxLite. Subwoofer box calculator, Sub box calculator
About WinSpeakerz: Loudspeaker Design software for Windows
Speaker Box Volume Calculator / Designer
Speaker Enclosure Volume Calculator
I am making a subwoofer box . Should the width of the box be big or small ? According to your answer Let me know the approx dimensions of the subwoofer box - Quora
Tattoo for Women: subwoofer box design
Port Calculation
Subwoofer Enclosure Calculators, Parallel, Series, Port Length and Volume