If, on the other hand, you assume constant impedance (for 49 drivers that could be 7 parallel series of 7 drivers each), you only gain about 3db by doubling the number of drivers, or a bit more precise: 10*LOG(49), which is 16.9db going from 1 to 49 drivers. If the impedance due to your wiring goes down from 8ohm (single driver) to say 4ohm nominal, you will get an additional gain of 10*LOG((8/4);10), which is about 3db in addition to what the extra radiating area gave you.

My budget array is ten $25 tweeters and sixteen 49 cent 4" midranges
per tower, ported.

I've been able to hit 122dB[c] on midrange from 12 feet away using
the Radioshack SPL meter. Upper midbass is >126dB[c] and I've had
stuff fall off the shelves in the kitchen.

I have four PLX3402 in bridged mode power the array with DCX2496.

It's a simple design. I don't know why you want to make a
design so complicated that performance might be compromised.

If you use drivers better than 49 cents and use better tweeters, and
execute the rest of the design well, it will be very sweet.

>http://home.pacbell.net/lordpk/speaker/

This is a good link..

Tks,

Renato