So I finally found another pair of EVM 15L drivers, so I didn't have to rob my main system of one (see Avatar) and finished building my first prototype horn, which is, after several dozens of iterations in Hornresp, is finally here.   I'm happy to report that it measures very much as predicted. Put the microphone at the edge of horn mouth and ran Frequency Response plots, same as I did with the FH-1 bin a while back. The FH-1 is similar to a Belle Klipsch/LaScala bass bin, but larger,