Thanks to the many intro posts on this forum, I've just started to learn about REW and trying to make the best of my current equipment and room. Added several GIK treatments a while back which improved bass, and now learning about REW. Bpape from the Acoustics forum has helped greatly with both processes and suggested some good improvements.
Now looking at my first REW attempt below, big dips at around 100, 135, and 155. I've experimented with L/R speaker (tower) placement bringing out from the front wall as much as possible and reduced these dips some.
The room is about 20 x 12 x 8, speakers on long wall, listening position opposite. Planning a sub upgrade at some point.