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Subwoofer Cable Connections and Selection

I'm a little confused about connecting my sub to my pre via line level.   Right now I have a 4 meter cheapo RCA interconnect that I probably got at Best Buy and want to upgrade. My pre has a L&R line out and my sub has a L&R line in.  But all the sub interconnects I see are sold as a single cable.  Everything I am reading online assumes there is a sub out on the pre and then that can go into either the left or right input on the sub.  But I have found nothing on a pre with left and right.  Can I just get a single interconnect and go from the pre left to the sub left and leave the right open on both?  Maybe the two outputs are to feed two subs?

Also, I see many sub interconnects w/ and attached spade connector.  I don't think I can use that.  How would that be used?

Here are a couple products I found that would be in my price range (<$200)
I have a Cambridge Audio 851N and Velodyne 1215X.  

Thanks.

Ken
treebeard1
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Post removed 
treebeard1 OP
148 posts
 
I decided to stick with my Straighwire interconnects.  I guess I just got confused seeing all the single sub cables and no examples of a 2-channel pre with a L&R out.  I also ocompletely forgot I had decent ICs to begin with. It's all hooked up good.  Thanks to everyone for your input.
nutty
3,091 posts
 
Straightwire makes "Y" cables connector subwoofer cables, all one piece.  Single ended RCA at the DVD players Line level output and two RCA's (red/white) at the subwoofer line level input of the sub. I use one on my Oppo to Velodyne. 

N
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