for isobaric drivers in SERIES:
motor force doubles. but motor force is bl^/2, so twice that value means bl increases by root 2 (1.414) all other things equal.
sd is just the sd of a single driver, so stays the same.
cms is the suspension compliance, so it gets reduced by 50% with two drivers. twice the suspension, twice as stiff. compliance is opposite of stiff.
normally, all of this results in a dramatic reduction in sensitivity (6db :-0 ), but preserves the same frequency response shape of a single driver in a cab twice as large.
not sure what the result will be in hornresp. could be better. could be worse.
good luck and interesting experiment!
something like this would seem like a real winner for a pair of inexpensive, weak motored, assymetrical bl field, drivers with lots of excursion that otherwise wouldn't work in a horn loaded environment.
Edited by LTD02 - 10/14/13 at 10:40pm