While I agree with much of what has been written here (and I'm a manufacturer) I can't agree with embracing things like room treatments. I'm an acoustician and an audio consultant, my name is attached to 7 of the 10 largest AV installs on planet earth and I trained under Eric Desart the creator of the quietest recording rooms on earth.
People do NOT need to embrace room treatment, most of it is utter rubbish, I've tested hundreds of products and none of them do what they claim.
People need to understand their rooms better, that is the be all and end all of good sound. But they DON'T usually need acoustic treatment in any way and they don't need to be playing with programs like REW that they do not know how to interpret properly. Room treatment is like cables and exaggerated isolation claims, it's pure headology.
If you want to to know more by all means take a look at our (very underpopulated but factually correct) posts on Halcyon-audio.com, we're British, so there is no conflict by posting a link. You might even find some of the articles useful