Lets start with location
Place the sub away from corner, away from the wall by atleast 2 feet. Use the crawling technique to find the optimum location of the sub without hitting corners or walls. In case you havent done this before, you basically place the sub on your couch or chair close to your ear level (use some boxes, or if you cant just put it on the couch. If you have bar stools or high chairs, they work great to place it at ear level.) Once you do this, play some song with a nice constant bass line, prefereably something thats repetitive. Make sure its low deep bass as well not a bass solo or something. Then basically get crawling around the floor around your house listening to the bass line. Start with the corner to hear what you DONT want to hear, you will hear loud Boomy bass that will give you a head ache in minutes. Then move away from the corner and a little away from the wall and crawl around till you are convinced about a spot where you feel it sounds the best. There will be spots where the bass sounds very weak as well, this is why its important to get a reference level by going to the corner to see how loud it can actually be boom wise.
Your final location should not be in the middle of the wall, not close to the wall (atleast a 2 feet away), or not anywhere close to a corner.
Next the risers, an alternative to the Auralex was this thing
http://www.walmart.com/ip/Gold-s-Gym-Aerobic-Step/10910439
The Aerobic step. (It was a little cheaper in store actually I dont think I paid more than 20-25)
See the gray thingies at the bottom, they simply snap off and have rubber feet. Use blue tak on the top and stick these to the bottom of the sub. Don't use the surface on the top, its just plastic and wont do any good, just use the feet.Raises it off the floor quite nicely and looks much nicer as well. This has helped immensely in my apartment, cos the floors and walls dont rattle anymore during movies. Yes I'm sure they still hear the bass when it gets loud, but this has definitely improved the situation. This makes the biggest difference.
Next step. curtains. If you can put curtains, this helps absorb sound a bit. Then put up picture frames around the room, nice big ones if you can. The more the better, as simple as that. If you stand at the center of your room and clap once really loud, do you hear echo, or reverb? If you do, your room will tend to be boomier with bass. Try and keep more stuff in the room to see if the echo/reverb reduces. Consider an extra carpet as well which can add to decor and help with sound.