Please help me!... No sound from Subwoofer...

I just got my system all setup... Yamaha RX-V473, 2 Pioneer SP-FS-52 for fronts, Pioneer SP-C22 center, 2 Pioneer SP-BS22 for rears and a Klipsch SW-350 sub.

I got everything setup, turned it on, and it sounds good, but the sub isn't working at all. The blue light is on, on the front... but that's it. I have tried it at 0 and 180 Phase, volume I've tried all over the range, I have tried it set on auto power and on, I've had the lowpass at 90, but tried it all over the spectrum as well.

I am a home audio NOOBIE so if I am doing something wrong... maybe not setup the sub correctly or something? I am using an RCA cable with a y splitter into the line in L/R. I am plugged into the subwoofer port on the back of the receiver. When I first plug it in, It makes a buzzing sound when I first plug it in for a split second and that's it. I've tried 3 different RCA cables.

I found subwoofer settings on my receiver and turned it as high as 8.0 dB just to see if I could get ANYTHING... and nothing.

What am I doing wrong here?

EDIT**

I put a CD in and the sub was working... but with my DirectTV, that is where it is not working, I had it one ESPN, if that matters.

Yes, I did run the calibration with the YPAO. I am using all HDMI connections. The Satellite is what I've noticed the sub not working with, it appears to be working with the blu ray player.

I'll try and mess with the settings in directTV in the morning.

The internal test noise does indeed put a sound through the sub. I just tried Inception on the Blu Ray Player, and it sounded brilliant, with everything working! So it must just be something with the DirectTV I guess.

I just tried it... GENIUS! I can't thank you enough! That was IT! Wow... thank you so much, such a simple little thing, and now, not only does the sub work, but it sounds 10x better overall!

You rock and I LOVE this forum!!! Man this place is awesome.

Ok we'll do. I'll set them all to small.