See if you have separate crossovers for your L/R and your subwoofer. If so, set the L/R crossover "frequency" to off, and then set the sub crossover frequency to whatever value you'd like.
Anthem AVM 60 full range front and sub doesn't work
I've noticed that to get the sub to come on, I have to set the crossover in the Anthem... I cannot just leave it OFF.. If I turn the crossover in the bass management OFF, the sub never comes on. I want to run my fronts full range with the sub.. My AVM 70 does this perfectly. Am I missing something here?