Splitter on preamp outputs

I have a Elekit TU-8500 ( by the way it sounds great ) tubed preamp on my audio system that only has one set of outputs to connect to the amp . The thing is that I would like to use a subwoofer with my maggies Could I use a splitter interconnect in order to get one pair of interconnect to the main amp and another pair to the subwoofer amp without any deletrious effect on the sound ?