I second not using Auralex,,, you'd be better off in the long run... Even if you do not go the DYI (which if you can, I would suggest like jimmy69 said) and use say GK Acoustics like I did, you'll be in much better shape and happier with great results,,
You can't really move forward as may like to with auralex,,, But you can with the proper materials and knowledge,,, a little at a time with some planning,,,
This guy has great info, he dos this all around the world,,, He loves this stuff,, you can even send him an email just for suggestions,,,
Resources - John H. Brandt Acoustic Designs
Great Tools and learning,,,
And even if not ready to go the GK Acoustics route, I would at least inquire and see what they suggest,,, estimates are free,, and they actually take the time to work with you, even before purchase,,, Rather bunch of committed people, even after purchase,,
He suggested my 10'5" x 13'8' x 8' 1" room would need about 33%+ area treated,,, this also was the suggestion from GK Acoustics,,, (about $800 custom bundled,,, not there bundles they have as I wanted better quality of their products)
Between all the suggestion of both I have really nice translation mixing and a pretty dang good recording area... I also have another bedroom just carpet and shelves, with some sound blankets from vocalboothtogo allowing some things recorded there also,,, I also use the blankets creatively for recording, both window / door area...
this isn't sound proofing, just really nice sound control, taming frequencies best one can,,, although the things I do are livable for the rest of the house,,, Meaning my Randall rg100es can be cranked a bit, lol,,, and vocals no issue,,,