It's pretty close to correct for super near field. My problem with it is that it's that way for all distances, and they don't allow positive bass boost. I do like the effect GLM has on timing and imaging, but I have to go in afterwards and provide additional bass boost (via .wav file) to get it to sound neutral again(like it does out of the box) at 3.5m. I really wish it would allow positive filters, so I could do it all with GLM. In my thinking, an EQ system that only allows negative filters below 500Hz ensures an anechoically bright speaker sound when the speaker itself is neutral(as Genelecs are).
My experience with GLM 4 and Genelec 8340 is that if I correct half of the numbers the program does, the result is sounding better. If the program shows a correction dip thats -12 dB at 44 Hz , then I go in manually and do - 6 dB.
I always set all corrections above 80 Hz at zero, - its much better to manually use shelving filter in GLM at frequencys between 80-500 Hz. You cant correct for reflections without worsening the sound somewhat.
And yes, a flat curve in a room is gonna sound thin because the eyes expect the sound to be affected by the room.
edit: richard12511 - You can use shelving filtering in GLM 4 to lower everything above 150 Hz , for example, and that way boosting the bass area. That way you can also tilt down the treble area , lowering everything from 3 kHz , for example.