The speaker include an Altec 511B horn and a Acoustic Elegance dipole 15 inch woofer, on a aluminium baffle.

When looking at the vintage Altec Santiago, Valencia the horn seams to be mounted on the same plane or even little behind the woofer, estimated 2-5cm .

However, on the Altec A7 the horn is placed substantially in front of the woofer.

Is time aligment something to bother about ?

Well, with regard to time alignment where to put the horn ?

a) Just mount it on the same baffle as the woofer ?
b) Little bit behind the baffle
c) Substantially in front of the woofer i.e align the horn and driver coils ?

I thought c) was the right thing to do but when loking at the Santiago or Valencia...

How does it come that it differ between the Altec A7 and Santiago ?