What is the purpose of the "Sub Stereo" function on the Smart Connect?

When using large speakers (Large) in "Stereo" playback mode with the "Sub Stereo Parallel" function activated, you can reproduce the full music signal (including bass components) through the front speakers and additionally the bass components through the subwoofer. In the Sub Stereo "Xover" mode, however, it is possible to separate the signals between the subwoofer and the (large) front speakers at an adjustable crossover frequency (40 to 100 Hertz).