I have it set exactly like the recommended initial 2 channel set up guide that came with the sub.
PEQ OFF
GAIN 0
Bandwidth middle position
Frequency middle 40
delay/phase 10 o'clock
crossover 80
volume 12 o'clock middle
low pass filter 50hz/24....... THIS ONE I WAS UNSURE ON WITH THE SIERRA 2 other setting was 80/24
Rumble off
Extension 14/high and some times low