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This site will be a repository of loudspeaker design formulas, both cookbook style and eventually some more advanced discussions on more esoteric matters. Check out the menu on the left (or the typical 3 bar button on mobile) for subpages and an overview of the site structure.

In case you were wondering, the circuit diagram above is a circuit analog of a passive radiator system. The left side of the diagram is electrical with a voltage source to represent the amplifier and the usual driver resistances and inductances. The right side is mechanical, the parallel capacitor, inductor, and resistor represent the driver mass, stiffness and damping, and the rest represent similarly the box, passive radiator and box leakage. In the center is a transformer that "transforms" current to Force. The turns ratio of the transformer is B*l, which is a quantity you may recognize from some specification sheets. The current through the coil is multiplied by B*l to get the force on the cone (represented by the first meter). On the mechanical side of this circuit, the current represents force, and voltages represent velocity. Capacitors represent masses, Inductors represent springs (or compliances) and resistors represent damping elements. I hope to go into this sort of analysis more, but not until I flesh out the more basic areas of the page.