spanozzo

I just purchases a ksw-15 powered subwoofer for my system. I also have RF-3, RC-3, and RS-3 speakers in the system. This is the first subwoofer I have purchased and I'm not sure the correct way to set it up. I am using a yamaha DSP-1 for my receiver and have the mono out from the receiver connected to the LFE input on the back of the subwoofer. I don't however seem to be getting that much more bass. When a have the receiver send test signals to the sub I need to turn up the volume on the receiver almost half way to get an audible sound from the sub. I have the level on the sub at about 3/4's. I have all my speakers setup as large on the receiver and all of my LFE being routed to the sub, but I don't seem to be getting much more bass if any now that I have the subwoofer. I thought I would hear a major difference. Do I have something hooked up incorrectly?