I did something I was never going to do. I added a sub to my 2 channel. I use a fairly efficient, 95db larger monitor speaker that supposedly plays down into the 30’s. I just hooked up a Rythmik F12G I’m pretty impressed with the generic settings - crossover at 50, medium low volume so I can kinda hear it, Placed near a corner, and sounds good at the listening position. I have older GIK absorbing stuff, monster bass on the back wall and corner traps, first reflections, ect…Of course some will say all this is worthless with out measurements. SO I also purchased the usb mic and the REW software. Spent a day last week and did the basic figuring out how to connect and use. I am clueless on reading the data. I spent hours trying to read tutorials but its pretty overwhelming. How do I start? Any simple suggestions?