http://www.pesupport.com/cgi-bin/config.pl?read=340023

Zedguy doesn't seem interested in fixing his problem because
he's hasn't replied to critical questions posted. It's premature
to blame his problem on the midwoofers when we know ziltch about
his design.

Right now, based on availability of product, the tweeter is more
critical in a line array design because there are only a few good
candidates whereas there are tons of midrange candidates.