Looking at these I'm really surprised no one has dealt with the reflection from monitor -> desktop -> ears. When I ran REW in my room (untreated 11x10x12 carpeted bedroom w/curtains and sofa) this was by far the worst reflection (other than the 100Hz bump due to room size). This reflection is independent of room size and wall treatment so I assume it will show up in most people's setups. Yet, it is not being dealt with (and it's hard to do so - acoustically treating the desktop surface makes it hard to move a mouse around or place a keyboard). In my case, the reflection caused a comb filter with a notch every 1.3kHz. This is caused by the destructive interference of a ray 5" longer than line-of-sight, if my math is correct. Covering my desk top with foam removed the comb filter. I guess I'll have to rely on Sonarworks/ARC to remove the effect around my head space. I think that'd be better than dealing with the comb filter. I have plots of the frequency response
here.