has anyone got any answers or idears on this -

with horns there output/impedience and efficiency is directly related to the size/width of the horn body there mounted on, as well as its flare rate and other complicated factors.
but in just keeping it simple the mouth acts as a acoustic transformer coupling the motor to the air inside the car or room etc, so heres the question-

if the same single motor had 2 flared horn bodies coupled to it would it be twice as loud ??
i guess in theory you could never get 2 to have identical phaze characteristics cause they carnt originate from the same single point but if they could or if the horn started as one but split into 2 as it flared out! ?

its been bugging me anyone???

So something like a transmission line-esque horn? You would have one horn inside another to increase the original output of the first flare?

Good idea, try it and let us know