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[MichaelSmith]

Hello,

Last weekend I bought a Yamaha HTR-5640 receiver and 2 Yamaha NS-555 floor standing main speakers. After it was all hooked up, I decided movies/music would sound much better with a center channel and sub. So last night I bought a Klipsch sc-1 center channel and Klipsch KSW-10 sub. I also purchased a Monster rca "sub" cable w/ a y-connector.
I connected the center speaker no problem, it sounds great. Next I try the sub. So I hook up the y-connector to one end of the sub rca cable and connect it to the LINE IN L/LFE and R in the back of my sub. I connected the other end to the sub output jack in the back of the receiver. I then proceeded to play with the receiver's speaker settings (set subwoofer to "YES" and messed with all the bass settings)... once I was satisfied with the setup, I tested the sub on cable tv, movies, music. Nothing produced any bass out of the sub, it was dead. The LED light on the sub was green(ON), but nothing was coming out. I tried increasing volume on the sub, tried different lowpass settings, put the phase switch on both 0 and 180... nothing.
Did I get a faulty sub? or am I overlooking something crictal here? I read on a few A/V forums including this one that you can connect your mains to the sub, then sub to receiver, but I don't have enough speaker wire at the moment to try that. I'm hoping that the rca cable I bought should be sufficient. Please let me know your thoughts on this matter.

Please help

I didn't find the right solution from the internet.

References:
https://arstechnica.com/civis/viewtopic.php?f=6&t=571705
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Thank you