[How to connect RPW-10 Subwoofer]

Thanks a lot to "The History Kid" for the information

AMD

[How to connect RPW-10 Subwoofer]

I have Klipsch RPW-10 subwoofer which I want to connect to Marantz SR 5004 receiver. 

The receiver manual recommends using SW (RCA) jack using a single wire to connect to the subwoofer if the subwoofer is powered (having its own amplifier). RPW-10 is a powered subwoofer.

The subwoofer manual indicates that this single wire (from the receiver's SW jack) should be connected to the LEFT/LFE (Line-In) jack of the subwoofer. But my dealer told me to connect this single wire to both the RIGHT and the LEFT/LFE jacks (Line-In) using a Y connector. 

My question is which of these two methods (connecting to only LEFT/LFE jack or connecting to both RIGHT and LEFT/LFE jacks using a Y connector) is correct?

Thanks in advance