Ian,

i tried to do it as explained but my fear is that my 2123's are busted. at the same volume the same distance i have about 3 to 4 db difference between the right and the left speaker. Next if i'm trying to bring down the horn and the slot to the same spl as the one of the mid after the 3.5 db reduction i will have to go way down on the l-pads which translates into a very damped sound. So there is a clear imbalance between the mid speaker and the rest of the drivers.

I believe i should change the 2123 firat and repeat the test.