So I just took delivery of this unit and what a difference. Initially, I thought it was only for studio monitors, but it can be used for FRFR systems as well. I’m using it with my QSC 12.2. Took about 10 minutes to do the readings and I was ready to rock. I run my fractal into the box and then the box into my QSC. Turn on the correction and it was night and day. Basically takes the room out of the equation and the bonus is that you don’t need to be in a DAW or use software to apply the correction. I highly recommend checking this out!