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
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