Quote Originally Posted by kexodusc
Not much really...the presence of carpet isn't going to absorb much, if any of those low frequencies. The nature of the soundwaves produced at those frequencies tends to diminish the carpet's effect.
What GM suggests is the golden rule for sub-placement. Of course where the sub sounds best and it where it can go in practice are often 2 different things. If you insist it remain in the corner than I'd recommend you just keep it a few inches out from the walls - maybe a foot or so if there's a port firing out one side. Experiment a bit and see what sounds best. My subs are located aobut 5 inches from the rear wall, I've noticed no ill effects placing them against the walls, but your room acoustics might reveal some unique results. Reflections are less of a concern with non-directional frequencies, we generally want more breathing room from walls with speakers, but for subs we can get away with less.
Many people jam subs into corners for the reinforcement and room mode excitement that provides. YMMV.
Thanks...the sub as two 12" downfiring subs with three ports (1 plugged) on the back...so it is better to keep the ports closer to the wall and give them some room?

I could also just turn the gain up a little on the sub (it's only at about 15%) and then turn gain up on reciever...it is only at +5dbA out of +10dbA if I want more 'crushing bass'..hehe