My Paradigm PDR-8 subwoofers are not making the grade

[inlayterms]

Hey guys. My equipment is listed below in my signature. As you can see, I have two Paradigm PDR-8 subwoofers, the specs for which can be found here at http://www.paradigm.com/en/paradigm/...4-5-9.paradigm. As you can see, the low frequency extension of these subs is only 35hz.

Now, I bought these subs because they are part of the recommended system and are meant to compliment my centre speaker and surround sound speakers. My problem is that, while I can certainly "hear" the subwoofers working, I'm not able to "feel" them, that is, I don't get that rumble in my belly as I do when I listen to other subwoofers.

I've tried placing the subwoofers in different positions (but haven't tried the "subwoofer crawl" as I don't yet have cable long enough to do so). As it stands, my subwoofers are placed about 1/4 of the distance in from each of the side walls, and about 1 foot away from the front wall, of my listening room. The subwoofers are also sitting on a concrete floor.

My questions is whether or not there is anything I can do to "feel" my subwoofers and not just "hear" them. Should I perform the "subwoofer crawl", build a riser, place them along the side walls, etc. or are my subwoofers just not sufficient to get that "rumble" in my belly? I ask because a friend of mine has two Paradigm PS-1000 subwoofers and the difference between them and mine is night and day.

I hope to one day upgrade all of my speakers to the Paradigm Studio line, but until then was wondering if there is any point in trying to do anything else with the subwoofers that I currently have. Thanks.