Why not horns?

My friend has meticulously set up his Trios with 3 pairs of bass horns in a dedicated and purpose built room with every little trick and room correction you could think of.

That doesn't mean he did it all correctly, only that he spent a lot of time and money doing it. Maybe he has, maybe he hasn't?

Are those the huge Avantgarde basshorns? I haven't heard them but they really aren't horns. A horn does not require a 250W amp. Those are woofers with a flared opening.

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"A horn does not require a 250W amp." I hope that was meant to be sarcastic. ;-)

Sarcastic, not at all, why would you need a 250W amp with a high efficiency speaker like a horn? I use an 8W amp with mine but it is a bit of overkill.

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I hope you horn enthusiasts are enjoying the world cup. Gives you a headache!

Having heard many horn systems in all sorts of varying set-ups I would say that my friend has managed to optimize his to a far greater degree than any other. So I would say, yes, he has done what was "right".

The size of the amp on the basshorns has nothing to do with what they require. Incidentally, it's 2x 250watts. One for each 12in. driver.
And while it's not a true full horn it is neither a flared opening. But by the time you triple them up you've arrived at pretty much the same place, I would assume.

I know he loves them and has managed to produce the best sound I've ever heard in a horn. And I know many others who love horns. But it's just not for me I guess.