ou should leave it at Full Range, so all the 5 channels will play the lower bass without being redirected to the subwoofer.
In theory if these Windows options is working at all, when the 5.1 speakerset has small satellite speakers (=SMALL SPEAKERS= Limited Range) that aren't able to produce the lowerbass lower than i.e. 150 Hz.
When Windows Full Range is Disabled, All the satellite's bass range from i.e. 150 Hz is cut and redirect to the LFE Subwoofer.

In reality since there isn't a windows Bass Crossover Frequency option, so windows isn't actiively doing the redirection itself, it's just a configuration indicator.
So depends on the Soundcard's software if they use the windows Full Range indication or not and do the bass redirections etc.
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