spray2000 :
Wait, What you mean is I don't have the inputs to run an amp or I do?
Ok, first we have to get on the same page, terminallogy-wise. your receiver has "inputs" where you attach sources of audio(turntables, tape decks, CD/DVD/BluRay drives, Etc.) and "outputs" where you attach destinations of the audio signal (Speakers, subwoofer, other recording devices) . Your receiver does not have an output for a powered subwoofer(or an amplifier to power the subwoofer) For the purposes of this discussion,it only has speaker outputs. As I said in an earlier post, to get extra loudness from your subwoofer, you would need an additional amplifier to supply it with the audio signal. In your case that means an amplifier that accepts high-level inputs( or sources) as opposed to low-level inputs, otherwise, you will simply "overdrive" the amplifier(supplying it with a signal stronger than it is expecting) causing it to be destroyed, literally.
Here is a link to the instruction manual for your receiver:
http/manual.kenwood.com/files/B60-5337-00.pdf
On page 13, it shows a "subwoofer pre out" connector, that you would use for a powered subwoofer. However your specific model of receiver does NOT have one of these, so the receiver itself has to power the subwoofer, just as it powers the rest of the speakers in your system.
Have you gone through the surround sound setup starting on page 16 in the manual?
After looking at the specifications in your manual for your receiver, it says that there is 100 watts available for the subwoofer. That should be enough for adequate volume. That makes me think that you really need to go through the surround sound setup to configure the receiver for using the subwoofer.