Near field in a studio is rarely as close as most people would put them in a "desktop" application, hence why I said "very near field".
How closely any "near field monitors" are designed to the intended purpose is debatable but the "golden triangle" formula is golden because it seems to be the norm... Same distance apart as they are from your ears, same height as your ears and far enough away from your head that you can not distinguish the sound from one driver from the other (it should sound like one speaker, not two speakers in the same area). Further, if they are closer to your ears than any of the walls (or other large, reflective surfaces in the room) you are then technically in "near field". A triangle five feet on a side is pretty popular as far as "ideal", for most such monitors. There used to be a rule of thumb about calculating the minimum distance based on the distance from the center of the tweeter to the center of the woofer too but with newer wave guide technologies (and horns) this one sort of got thrown by the way side. Last but not least these should be placed in such a way that early reflections are minimized, ie, on stands, suspended from the ceiling, or at the edge of a surface, not on a flat surface with a large, radiating expanse out in front of it (like flat on a desk?)
Mostly the JBL interests me... and worries me... because out of all the speakers I've read about in this thread so far, they may actually be the closest to a real studio monitor, rather than a great choice for smaller rooms and/or on a desk.