How parallel and series wirings affect T/S parameters

[gregulator]

I have wondered that myself, particularly when it comes to altering a Zobel in an MTM, for instance. You take a driver such as the one you have, or an 8 ohm driver such as the Dayton DC160-8, wired in parallel. It also shows a large impedance increase as the frequency rises.

I believe the voice coil inductance acts like a low-pass filter with cutoff frequency wc=Re/Le. So the transfer function H(w)=1/(1+jw/wc) will be the same with a single driver as it is with two drivers in parallel or series. Just use the values from the table to compute your zobel network and you should be good (e.g Re/2 and Le/2 in the parallel case).