Best calibration out there, i wouldn´t risk it with software and microphones from other companies, even if they are calibrated. I have noticed that the smallest of changes in your measurement process causes dramatic results to the end result, so I wouldn´t trust any other mic apart the one supplied by Sonarworks, calibrated by them to work on their software. I was having troubles at the beginning on having the software calculate the distance from the speakers to the hot spot, to the point that I thought that my room was just impossible (I already knew it was a bad room). So I decided to do things in a more precise manner. I got help to locate the listening spot with a marking on the floor, and measured how high were my ears when in my chair. I placed the mic on stand, and performed all measurments at (the same) ear level. When measuring the speakers up close, I made sure to measure the exact distance from the cone to the mic diaphragm, and used it for the other one. Guess what? Once I got precise, the software calculated the exact distance (and I mean exact) distance between each speaker, and same for the listening spot. So I managed to (finally) complete a measurement session and got my curves. I have attached some screenshots below of the Before/After/Correction curves. I was expecting a more drastic correction, because the room sucks, but the results with this curve are great. It´s cleared up the low end (it got rid of a null and a build-up) so now I know better what happens in there, and yes, as other say, it sounds more open. But to me this is because somehow it clears the centre image of trebble fuzz, and suddenly everything becomes more defined, specially the sides (where most of the trebble should be). I think a lot of this sparkly fuzz comes from having a monitor close behind the speakers (but not in the way of the cone and tweeters, ofc). Sonarworks got rid of that as well. Now I´m a bit annoyed as I have a slight volume difference (-1.23 dB) between the speakers, so I need to balance that and do a new measurement, but I´m so happy with the results that I really don´t care doing as many measurements as I need. Remember, with Sonarworks speaker calibration, precision is key!