The other day I picked up some sub cable and while there, sales guy asked me if I wanted a "Y" connector for the sub. I didn't know anything about it, so he explained if I had a left and right RCA input on the sub that I should use it. It "adds a little more quality" he said. Other than that he didn't really explain well to me, so I thought I would ask here first. On my sub,(Sound Dynamics ths-1000)I have two RCA inputs, along with the high level inputs. One is marked xover input, one is just marked input. The on just marked input is where I have receiver hooked to. The xover input is red, the other white. The sub manual just says the xover input connects to subwoofer output of xover. Not very helpful (for me at least !) Is this what the "Y" connector would be for? Do I need it? Once again, thx for help.