Hope you can provide some insight.

I've been modeling a mid horn and got results that indicate very flat response from 150 Hz to 1000 Hz with a conical horn. That part seems great to me. The throat/Sd ratio is 0.5 which isn't out of line.

It's a 6" driver that seems to need a 3L back chamber - physically that's no problem given the driver dimensions.

What's bothering me is that the horn mouth has a radius of 10-1/8 (325 in^2) inches BUT a length of only 7 inches.

This seems incredibly short - why does the response plot look so good?