How exact is the lowpass and highpass crossover - is it 60, 70, 80 Hz etc or is it 60, 61, 62 Hz etc.?I do not have a sub, but while playing music:
Turning on the sub in the app and changing the cross-over freq. does not create any unwanted noise. It does change the main speakers cut-off as it should.
With NO music playing there is also NO unwanted noise while changing settings in the sub section.