Hi spurxiii, thanks for the questions.   I actually did all of the above. When I played a song with really heavy bass, I was getting more response than I'd seen before, so perhaps the issue is that the subwoofer is not ideal for the songs I listen to generally.    Given this, what kind of...

Ok, that makes sense (sorry, really new to all of this).   Can you think of any other reason the subwoofer would be performing like this?

Yes, it's an active sub, and I do have it plugged into the sub out. I thought it would be easy as that, but like I said, the level of output is way below what I would expect. 

I'm slowly entering into the hi-fi audio foray (and I'm really excited!)   Over the holidays, I picked up the following gear:   - Pro-ject Debut Carbon - Yamaha R-S300 Receiver  - Audioengine P4 speakers   This seemed to be the best combination for the sound I wanted. I enjoy listening...