If ARC measures distortion, it could be your subs are more linear than the 180 below 80Hz so ARC hands those duties to them.


A-LFR/1000-8 & 2/500v4x2
1000-3,1500-3
100,160,QS10x2,800,M5x2,M2/3/50v4
Air Force, Freedom
had v2