I am going to try a lame experiment and see if a JBL 2242 will reach up to 200hz - 300hz to meet the horn used with subwoofer plate amp with 40hz - 160hz variable crossover internally.

Since 160hz to 320hz would be just one octave, should be interesting to see what doesn't make it as my room is small and everything loads quickly in my system. Bass and mids have no problem and usually have to be padded more than most folks would use.

I am curious on what the impedance curve looks like if you use a 18" and 10" both being 8 ohms makes the total system look more like a 4 ohm at the bottom octaves, does it not?

Ron mad backyard audio scientist!!! LOL!