[m-fine]

If you have DCX-Remote version 16a, the options under the EQ and dynamic EQ tab are only Parametric EQ and high and low shelves. A low shelf will raise or lower the signal level for all freq below the shelf point (with a several octave transition above and below the center freq.) which is a useful way to impact freq below 20 hz, but not whatyou are after.

To do SS with the software, got to the x-over tab (4th one in 2/3 of the way down the display). Select the output you want along the top right edge. For HP filter select But 48, frequency 20. For LP filter select Off. The settings will be the same on the LCD display but navigation is a bit clunkier.

There are not 2 channels BTW, just entries for High Pass and Low Pass. Ignore the top box for now which is just a name, or select Subwoofer. The next two down are for the High pass (what you want) and the bottom 2 are the Low Pass. If you have a LP at the same freq as your HP you are basically telling it to filter out everything above and below that frequency! Remember HP means let anything above this freq pass and filter out what is below, and LP means let anything below this pass and anything above gets filtered out.