"I don't have the screenshot here, but I was playing around in Hornresp, and the MFW15 in a 7 cubic foot ported (22hz tune) enclosure actually came surprisingly close to the horn F20 model. Wondering if I am doing something wrong in hornresp, or is the MFW that good with ported? I checked and they were both at 0.5 pi.."
i performed a similar comparison just a few days ago
and got similar results. the spl advantage of the
horn is only marginal at the bottom end. a ported cab
vs. a tht only gives up about 1db in sensitivity at 30hz.
the high sensitivity advantage of the horn comes toward the
top end of the response. max spl is a little different story.
the horns have about 5-6db advantage there where the ported
is excursion limited (the 30hz ballyard) for a ported cab
close comparable to a tht. the same would be true for the
f20, but a little lower in frequency. like lilmike noted,
horns don't have port compression or chuffing to worry
about, which is another advantage.