Can I hookup a Subwoofer to a ADCOM GFP-750 Preamp

I want to hookup a my Subwoofer with a cable directly into the preamp. Looking at pictures of the back of the preamp online and dont see any jacks. Thanks Ed-
You will need to use a Y-splitter at the preamp outputs, if the ADCOM does not have a second set of preamp outs that you can use.