I listen to music a lot more now since I got my system setup even during the night when everyone else are sleeping. A new habit

I was just fine listening to quiet music with CBM170SE pair taking the full load but now since Rythmik F15 arrived I wanted to feel how that makes the difference.
However, it doesn't seems to turn on in auto mode (I didn't want to leave it on when I go to bed half asleep) while I'm listening with the volume down. It seems about -40db level is needed to trigger it on but that is a little too loud in the middle of the night.

Is there a way to adjust the triggering level? I can solder if needed.