High Efficiency Speaker Asylum

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like already said Multiple drivers for each pass band.

Posted by Bill Fitzmaurice on April 23, 2017 at 06:21:18:
If one driver has 87dB/2.83 volt sensitivity two will have 93dB, four will have 99dB sensitivity, eight will have 105dB sensitivity, so it's as simple as that...if your amp will drive a 1 ohm load. Assuming it won't then you have to use a combination of series and parallel wiring to keep the impedance within a useful range, and that means even more drivers.

OTOH with a large enough horn you can reach 30Hz with 105dB sensitivity with one driver.