What happens to the parameters Vas, Qms, Qes and Qts when you connect the two voice coils of the 1252DVC in series?
A12 – The answer is not immediately obvious, so let’s look at a single voice coil first. I will ignore the voice coil inductance which has little influence at low frequencies. Using the force-current analogy we can transform the mechanical driver parameters to appear as electrical components between the voice coil terminals. The driver moving mass becomes a capacitor C that is inversely proportional to (B*l)2. The suspension compliance becomes an inductor L proportional to (B*l)2, and the viscous losses are represented by a resistor R proportional to (B*l)2. The equivalent electrical circuit between the voice coil terminals consists of R, L and C in parallel and then connected in series to the voice coil resistance Re. Series connection of the two voice coils doubles the wire length inside the magnetic flux, thus (B*l)2 increases fourfold. Therefore, C decreases to 1/4th, and L and R increase by a factor of four. Voice coil resistance Re doubles. As a result, the purely mechanical Qms,
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