"Blind Joni" wrote in message


The woofer might be a B&C 18", not chosen primarily for air-moving
capability, but rather for directivity control. I'm thinking of
covering the 80 to 270 Hz range with it

Explain to me how the choice of a raw speaker has an effect on
directivity in this frequency range.

I'm looking into applications of cardioid loudspeaker design principles to
provide that feature.