Yesterday was sub/mains setup day. Tried crosssover at 80, 100, and 120 HZ a dozen times. Played a variety of tracks thru the system that have combinations of drums, bass, rythym guitar, piano, Steel Guitar, fiddle. At each freq I also listened to sub only and mains only. Then at each freq I sang and played Tele with some tracks. 80 is out, just not enough content going to the sub. My favorite was 120 hz. But then later in the day I liked 100. All at moderate volumes in the studio. With sub and mains away from walls in the center of room.