All of these monitors have bass and treble trim switches. I run the JBLs with both bass and treble switches down -2db, even with the monitors a few feet from the wall and about 7" off the table. Without the adjustments, I found the JBLs to exhibit a very slightly V shaped FR. Similarly, the Adam A5X have a < 300Hz bass shelf, 5kHz treble shelf, and a tweeter pad with a ton of adjustability. I haven't used the A5X on my desk, but in instances where I have heard them in studios, they were fine. Placement from walls, size of room, sound treatments, monitor orientation, etc. are all going to have an effect on FR. Also, the manufacturers are going to make certain assumptions, so plopping down one way with one monitor might not yield the same FR as another monitor. Bottom line is that these monitors can to be, and in most instances, MUST be tweaked (placement and trim adjustment) to get desired FR in a specific environment. Some monitors are more easily adjustable than others. I mean, I remember reading a rando's review of the A5X saying they were dark sounding - the dude had them sitting flat on a table, shoved against a wall, and just toed in slighty. Go figure.