Hello - I just moved into my house and would like some input on how to read the 2 graphs that I just made. I understand what peaks and troughs (SP) are but not sure how to read them... meaning what is a big dip and what is nothing to worry about... what looks good and what does not.... \n\nBelow is an overlay of my first two graphs... the green is with nothing on the walls and the blue is with a few panels laying against the wall.. \n\nI can see that with the panels... the 38.7 kHz range improved by about 7 db. I see there is also a big blue nasty dip somewhere around 160khz... What does all this mean and how to you go about fixing panels and such in an attempt to flatten the line as best you can.. I know flat is impossible but I've hear that the line should be around + or - 3db of the main line...\n\nAlso, where should the main line reside on the db scale? I used the umik and its calibration file and set the sound generator to 75db.. What next?