Q: Is there a way to know when the speaker is going into the limiter from the ControlBASS app? It would be great to know if the volume is hitting the limit instead of having to check behind the speakers for the green light. 

A: The LED on the back of the cabinet illuminates when the limiter is active. It comes on when the limiter is  reducing the level by 6dB or more.

The display in ControlBASS shows how much compression is happening in a continuous vertical graph. The output level is displayed vertically from the bottom up in the center of the display. Gain reduction is displayed from the top down, to the right of the output level meter.