You can see the effect of inductance in HornResp, just run the sim, then change Le to 4mH, run it again and compare the two. There's very little difference in the passband, a major difference above 100Hz. OTOH the room will have a huge impact on response. That's why measuring outdoors is critical, lest you drive yourself nuts trying to fix something that isn't broken, or trying to fix something so badly broken that it's un-fixable.When I do longer sweeps from 20-70 I begin to see what you mean by the inductance. There is mild unevenness in sound (whether it be from the room acoustic, inductance, whatever), but I think I might be able to pull a good portion of that out with an equalizer.