I have a Harman Kardon AVR-135 and I am trying to set all the levels to my liking, but I can't find where to change the crossover frequency in the setup menu. The crossover seems to low, and my sub is putting out too much sound.
Daniel: what do you have the front speakers set to? If you have them set to "small" you cannot set the crossover. You may also want to change the "bass management" to independent to get more control.
What brand and model are your front L/C/R speakers? Do you know their specifications?