Found a picture of LARGE MOUTH BASS as an example of using
long-forgotten math recouped to apply to a horn-loaded bass
loudspeaker.
LMB on the left (3-parts connected) and one of the main speakers (TWIN PEAKS).
Passive cross-over between "Heads" (Horn-loaded tweeter and twin midrange)
and electrnic cross-over between heads and "Bass Bin", therefore separate amplifier
for the heads and the bins. The Large Mouth Bass also needs a separate amp.