I asked Jerry just this, and I tried hard to remember exactly what he told me. This is the first three-way designed with every driver doubled, and apparently doubling the drivers is extremely important. Doubling them halves their distortion in some important characteristic, and lowers the transient response time of each driver. The JH13 are twice as fast as the JH11, which is less than twice as fast as the JH5. There's magic in driver doubling.
So, to your question, line array might not be a bad way to think about it.