Advice on dedicated room

Have fun with the project, & let us know how it works out!

Hate to tell you this but at 15x16x8 your room dimensions are your biggest challenge. LxW is very nearly square and almost perfect 2x H. Do the math, work out the modes, you will see they cluster big time. I would do this first before anything and plan accordingly. Maybe you can use a false wall to make one dimension less a multiple and incorporate a bass trap behind it tuned to absorb in the range that is left. This will be far less intrusive and way more effective than adding traps later. 

Do not fall into the trap of thinking more and thicker is always the answer. As already alluded to this only traps and stores energy in the room. Sound energizes all room surfaces. What you want is not so much to try and kill this as shape it in a way that sounds good. Your room is small but if done right will be made to sound more spacious than it is.

This small a room will also make it more important than ever that you use a distributed bass array and Townshend Podiums and Pods for isolation. The DBA will make your small room sound huge, and isolation will greatly diminish the rooms impact on the sound by energizing it less. Money spent on these will far outweigh a lot of much more expensive acoustic treatment. 

If you don't know how to work out the modes then look on-line or get Robert Harley's The Complete Guide to High End Audio. My first edition has step by step instructions for mapping room modes. There's probably faster ways now than a pencil but however you do it just be sure and do it. Whole lot easier to fix it first on paper and build it right than to try and fix it later with a lot of expensive space wasting tube traps.

@mike_in_nc  
Thanks for the first hand experience advice it is very helpful. I will add a system to my page when it’s all done. Ordered my speakers today ! 
@millercarbon 

I will probably be adjusting for a better ratio and the DBA is on my list too. I have Robert Harleys book and am reading it now in my limited spare time. I will go to the modes section and learn about it. It’s a fantastic book! Thanks for the advice. 

Regarding bass: I agree with the suggestion to use a DBA. My main system has two JL Audio F112 subs, and I was delighted by the improvement when I added a third (a small B&W ASW 610) as proof of concept. That improvement went up another notch or two when the B&W went back to my desktop system & was replaced in the main system by an SVS SB-3000.

Just FYI, my room dimensions = 20.1 ft L × 12.5 ft W × 7.0 ft H. Calculated modes don’t agree terribly well with measurements. The effective dimension is not always at the interior wall surface, it seems.

You can take a look at my system in my house of stereo. It includes construction pics and details in the comments section that may be helpful to you. Have fun with the process. Be patient.