Ok, I had everything right except for the level calibration. I let the mic do that and it had the sub at -10, I put it at 0 and there is a huge difference now. Thanks
I just got an Onkyo TX-SR703. My sub is a velodyne CT-120. I made my own cable using RG6 with compression type RCA ends then a y adapter at the sub inputs. The run is probably around 25'. I noticed that the volume of the sub is not loud at all, I can't even get it to reach excursion limits...