Todays sweepings and adjustments:
The 3 kHz things is still there. I swapped speakers, no difference. I measure with an "argh-cough-argh" ECM8000 through converters and preamps from the Lavry Blue line. Could it be the cheapo microphone?
Other than that I've realized that I will think about putting some lo-mid Pacman (or fatman) at between 3-3.8 meters away, there is place there for absorbers. Seems the only way to eat the 114 Hz is to go further away.
Edit: Just realized it is 1/12 octave smoothing here, but what the heck...
Best Rgeards
Patrik