My english is to bad for write, but I will try.. I read without
problem!!!!

I already finished this Line Array and the sound is very..very good,
fabulous... but, the MID of 4" have a FS at 80hz and the result is a
bad, bad bass response.
http://www.mrweb.com.br/fvm/laf2/

I use active crossover and for bass, I finished this subwoofer:
http://www.mrweb.com.br/fvm/sumario/

But now, I think in build 2 modules for bass response in stereo mode, with this
excelent MID (FS 34hz) to work between range 34hz to 200hz
http://www.mrweb.com.br/fvm/akron/

The BIG question is:

Is possible have "near field" bass response using only 4 drivers in a
tower of 1,80m ??????

Because distance C-to-C will be 60cm and this distance is equal to one
wave at 573hz. 1/2 wave is 286hz....

Thanks,

Renato - Brazil