I did have mine set at +3 for both 25 and 50Hz knobs and the bass was impressive. But after performing a crude frequency test using the downladed test CD and a Rat Shack meter I now have it set at -2.5@50Hz and +2.5@25Hz. The bass now has a little less emphasis than before but the overall sound is improved or maybe more balanced at this setting. Perhaps too much bass smothers or smears the sound from the panels?
I'd also like to add that this particular room has some acoustic issues going on. You can walk to different parts of the room and hear more or less bass depending on your location. I have it tuned for optimum sound in the sweetspot seating location. This is why a dedicated room would be nice to have so I could optimize the room acoustics without it having to serve another purpose. But then it would be an overly compromised main living room (aesthetically speaking). Nevertheless, I'm very happy with the setup I have.