Preamp connection to Sub

Hi,

I have a Rogue Perseus pre that I want to hook up to a Velodyne powered sub for music. I know I should connect it from the variable output section on the pre. The pre has 2 outputs but the sub only has 1 RCA input. Should I get a Y splitter from 2 to 1 or can I just plug in the 1 cable?

TIA

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