I would like to do some full range measurements of my HT room. I know RS SPL meters are not recomended for this. Is there anyway to use the Audessey mic that came with my Onkyo AVR to do this? Would I have to load a .cal file? Does one exist? Can one be made? Also I have a dbx RTAM analyzer mic that I could use if it could be used with better results but again I don't know where to find calabration files for them. Could I use the response specs to create I file? If so, how would I go about this?