Originally Posted by MKtheater
Horn speakers work the same way THX specs work, depending on the horn or waveguide. Limiting vertical dispersion and great horizontal dispersion. If you can go big I would try to hear the Klipsch La Scala's, JBL 4722N's, or something similar. I am using DIY horn arrays which I love so maybe a line array of some sort would work?
I'm sure you mean the result is the same, not they work the same way.
THX is just a set of specs, they don't dictate how the specs are achieved. My point was, if the speaker hits THX Ultra 2 spec, the vertical is limited, horizontal is maximized. This is almost never true for speakers NOT made to Ultra 2 specs because it usually costs more to make. Using horn shape for vertical control is sometimes cheaper than the multi-driver, complex crossover idea, but horns have their own issues and advantages, as does everything.
The one caution to "going big" would be how close you are to those big speakers. The vertical spacing between drivers determines the minimum listening distance, the acceptable "near field". It's possible to have speakers big enough that you can't sit far enough from them in your room. No need to dig deep into the math here, but the farther apart the drivers, the farther you have to sit from them so that the crossover region integrates well into the total response. The JBL 4722N for example is almost 50" tall, the top woofer is more than 16" from the center of the horn, and the bottom woofer is more than double that, so the driver spacing is large. You can't sit close to these things and expect their best performance in the crossover region, which is at 800Hz, in the critical mid-range. These are cinema speakers, so you need a really big room to get far enough away from them. The La Scalas would have less of an issue being physically shorter and with the radiation center of both drivers closer. You're still not sitting close, though.
The MK Sound S-150 has a completely different driver layout, and is designed for much closer listening position, specifically like what you'd find in a home theater, editing suite, or modest sound control room.