Room Treatment

I have GIK too.  Call them or send a pic of your room and they will tell you where to start

I've used GIK and yes, I made room measurements using REW software first.  Before you buy anything, do yourself a favor and optimize speaker and listening position before you begin adding treatments.  Simply optimizing speaker and listening position, guided by measuring responses, can do more to improve frequency response than a whole room full of treatments.   Treatments actually help most with reducing low frequency decay times, which produces articulate vocals, and treating early first reflection points, which improves imaging.   The more you can do on your own, the more you will benefit from consultation.  GIK is a great resource, but they are in business to sell, not to help you make most efficient use of your investment in treatments.   All of the companies that sell treatments offer really good tutorials and tools on their websites.  Real traps, for instance, offers a wealth of information which I encourage you to use.  But I suggest you stick with GIK for products and advice. 

As brownsfan suggests all these companies will over-sell you. Not that their products are not good but it helps if you know what you want ahead of time but doing some experimentation. Find your 1st reflection points using the mirror method and dampen them in series using cheap acoustic tile.  https://www.parts-express.com/sonic-barrier-fwp122-studio-acoustic-foam-wedge-panel-12-x-12-x-2-black-12-pack--260-547
Dampen the front wall first then the side walls. Some people actually like the look of the tiles. Once you have it figured out you order the size and number of decorative panels you need. I am not a fan of bass traps. I have measured several rooms with and without bass traps and have not found any alteration standing wave location or intensity.
In damping the reflection points correctly you should notice that the image solidifies like a picture going into focus. Once you have the proper image you can stop. To get the best bass possible in your room get a rolling desk chair and roll your self back on forth in the area of your listening position to find the spot where the bass sounds best to you and plant your listening chair there. 

GIK is one of the highest value product providers out there. For the price of a tube trap from ASC you can treat your whole room. Also, their advice is professional level.

Best,

E

+1 Miller.....