I finished up my newest 100L sealed Tempest design. I also picked up a used ART 351 for practically nothing on eBAY. I've been EQ'ing all morning and got my freq response +- 5 db from 18-100hz. The graph looks great. I knocked out two huge room gains and bumped the low, low end up 1-2db. I then turned my mains on and now... +- 15db from 20-100hz! I expected some change but not this much. I've run phase checks and everything is ok there. Should I EQ with my mains on? I'm testing with 1/6th octave tones via CD with SPL and mains on small.