I just received my s-10 subwoofer and I noticed that there are two RCA inputs (L,R) on the sub.  My receiver (Denon 3806) only has one RCA output for the subwoofer.  I currently have the RCA cable connected to one of the sub inputs.  I see that they sell Y adapters for subwoofer cables but I'm not sure if there would be ...

So I received my 422/S-8 setup yesterday and was very excited. Problem is....I don't have the mounts yet. So, the impatient person that I am, I decided to hook up the sub to my receiver (Denon 2105). I hooked up the sub into the "Subwoofer Pre-Out" on the back of the receiver. And then, using the "Y" cable, I connected the ...