Quick question about sub pre-outs

Just a quick one here, I have the Eonon head unit and it has 2 RCA sub outputs labelled Sub 1 and Sub 2, each consists of 1 RCA plug.



Does anyone know if I should take the first sub out and split it to plug into the 2 inputs on the amp, or plug both sub outs, each into an RCA input on the amp?



Or will it effectively make no difference? I kind of suspected the 2 sub outputs would just be 'split' inside the head unit rather than being 2 different channels.



Thanks