The proper crossover is applied to the *stereo* analog inputs, since those are digitized for processing, but *not* to the 7.1 input, which is pure analog. There is no such thing as "full range bass limited". If it's bass limited, that means a crossover is in operation! The high pass will be 12 dB per octave, but the sub out will have a 24 dB per octave low pass.