Acoustic Room Treatments

You have a relatively small listening room.  Bass control will be your biggest challenge.  Focus on that first.  I would highly suggest you do your treatments in steps.  Take care of the bass then move onto the first and second points of reflection.  Do some treatments and then add to them incrementally and listen to what you are hearing as your room develops and progresses.  If you follow this you will not fall into the trap of overtreating (over spending) and making the room dead.  Take your time, it's a journey not a sprint.  Good luck and cheers.  

I believe that contouring the bass will be near impossible via room treatment and instead will be most greatly influenced by speaker and listening positions. If there is space and WAF, then two or more subs are likely going to be a far better use of limited real estate than bass traps.

The next step as suggested above is to treat first reflections, which you will likely notice and appreciate the most.

Good luck!

A great way to start is to use cushions (couch and other), heavy blankets, pillows to experiment with to get the hang of it. Then companies like ATS and GIK can help provide better looking and more effective treatments. They also do sonic analysis. Personally, I have found it better to listen and learn better than all the "sonic analysis"... but that is me. 

Ditto to what @jastralfu said.  Recommendations regarding room treatment will not be meaningful without measuring the in-room performance of your current system.  Every room will exhibit different sonic characteristics even if the dimensions are equal. The materials used, carpeting versus hardwood floors, etc. will impact the response you get in the room.  The other critical factor is placement of your speakers which will activate different room modes depending on placement in the room.  REW will help you identify frequency response issues with your current. speaker placement.  Take measurements with your current speaker position and then move speakers around till you get the best response possible.  Once you have optimized your current setup then the measurements will help you determine what type of room treatment is necessary to fix the remaining problems. I have done this and have worked with GIK. They are terrific.  Good luck.

Joeradio,

11' x 15' x 8' is not a bad shaped room, so you should be able to treat it well with some assistance.

Give GIK Acoustics a call, and see if John Dykstra is available for a chat; Chris and Paul are also excellent, but John is who I've work most with. They'll walk you through the entire process, including the EQ Wizard software, and will make realistic recommendations based on your budget and desire.

It's mostly absorption and diffusion with proper placement, and in the proper amount......more is not always better. It's not rocket science nor complicated once you get into it.