the subwoofer im looking at has only RCA inputs and outputs (one pair of inputs, one pair of outputs). how would i connect the sub to line level? the receiver im getting has preouts but is that all i would plug the sub into, with front speakers wired to front terminals on receiver? the outputs, if needed to be connected, how would i connect those? to the front RCA inputs in the receiver? or would i need some sort of converter? any help would be appreciated. its an amazing sub and it would blend in nice with my fronts, and i dont want to connect the sub with the LFE preout.

pic of receiver