Originally Posted by
davef
Driver size and how they merge at crossover (phase matching) are not related to each other. Larger drivers that are tasked with merging with a small tweeter (for example) might have a minor directivity mismatch when listening far off-axis, but this is not a factor for nearfield. This is why so many popular nearfield monitors use 6.5" woofers and even larger.
The key is designing the crossover for driver summation at a very close distance (Sierra-2EX accomplishes this at 6") + very wide horizontal dispersion.
I actually don't recommend HTM-200 for extreme nearfield use because there are 2 woofers producing the same frequencies at different positions, although at 2.5 feet minimum - they are fine. However, they do not have nearly as wide horizontal dispersion as Sierra-2/2EX or Luna (even wider)