Subwoofer connection options?

Im running a system with a computer running jriver media center to a nad c510 pre-amp dac which does not have a sub output I have connected it to a sub in the past to subwoofers using the speaker wire connection option but the new svs sub i bought does not have them only rca inputs -Normally you would hook it up with a rca Y connector but I've got the nad dac hooked up to a power amp using xlr cables-do the rca's stll put out a signal when xlrs are being used or what are my options? any ideas🙂
 
Some do, others not. Best is to ask this at the NAD support or in fora where NAD users are. We can't know that, except when we do that.

But if they do, that can be a valuable option if the preamp can drive it and that sub has it's own low pass filter.