"There is no replacement for displacement" or is there?

Great big linear drivers that can handle the power required to push them in large vented enclosures. Regular drivers in super efficient horns. How can they compare? Do they compare? Using the same driver, can you load 1 in a horn and make it out perform 4 of the same drivers in an LLT? Now I know you want high excursion drivers in LLT's but high efficient drivers in horns... but I hope you get my question.