Subwoofer output closer or farther away from wall

While I'm not familiar with this sub, or capabilites/attributes, the real only way to increase it's effective output potential in your room is to indeed get it closer to boundaries! You need an extension cord to solve your "reach" issue. As for your concern about the sub having "no port" to "emphesize it's bass", that is of no issue. Simply moving the sub acoustically closer to the corner will reinforce the bass, and more so up the frequency range as you get closer and closer. You'll reinforce more of the room bass modes this way however, and the sub takes on more of a "boomy", "one-notey", "peaky" and "unatural" sound however this way. Still, if you don't have enough sub, this is all you can do.
The solution to this placment, besides proper seating consideration for smoothest bass response, is to "EQ" the sub out for all seating considerations!
Another compromise, to give more bass output(although not as much as corner), is to place the sub closer to a wall on the floor, wich will boost the already 3 db(generalizing for all frequencies covered) boost your floor is giving you by another 3-6db. The corner will boost even more of course.
You'll, by the way, have to consider for phase adjustment once you move your sub away from your speakers in relation to the seating possitions, so consider if you have control over such(even reversing wiring if you have no phase control, and it needs reversing).
Hope this helps

With a sub you should not really be aware of its output unless you turn it off, if you catch my drift. I doubt it is output. Those are the same subs on the Infinity Prelude and Intermezzo 4.1's. Did not the sub come with a RABOS kit? This kit will allow you, with a little patience and difficult reading allow you to set the volume and parametric EQ. Like I said I have one of the suckers attached to each speaker and rarely do I know they are working unless I forget to turn them on, and they are almost flat in response to 23 Hz in my room. Maybe you are missing the "boom" of regular speakers? If you have the kit and need some help explaining how it works shoot me an email and I'll help.

I pushed the subwoofer closer to the wall, and the improvement of the low end in comparison to the previous set up is not small. Now, I can feel, I guess hear it being more active than before. The other question that I have Kchahoc, you have the same subs, right? Was there a different between having two instead of a single one? I wonder. They are on sale now, but I wonder, if I will be able to hear an improvement should I get a second one, or I will overbassing my listening room. How is this sub in comparison to others you have heard?