It's not really true that PA drivers "project" further than a similar car audio driver. PA cabinets use waveguides and arrangements (like line arrays) to shape sound, but that's not a direct tie to the driver itself.
In reality there's not that much difference between the two. But in most cases a 3-way isn't going to sound any better than a good 2-way unless you take the time to properly rebuild the doors for your midbass, create custom pods for the midrange/tweeters, and spend an eternity tuning it with active crossovers. It takes a ton of work to do it right.
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