Room Treatment

I made my own simple corner absorbers several years ago out of covered Owens Corning 703. 8'x20"x4" deep, standing in four corners, they are considered more of a broadband absorber than a bass trap. I since have come to understand I can get them to absorb more of the lower frequencies by making them 6" deep, and I am also looking into putting a front diffuser pattern on them to keep some of the mid high and highs  in the room.  

ama732mx1, It makes a difference that you are dealing with a living room  where you do not have complete freedom due to a concern for aesthetics. Typically one also has limited flexibility in speaker and listening position in a living room. 

I have miserable acoustics in my living room, where having traps and panels all over the place is a non starter.   I went with a different approach in my Living Room.  There I used a Synergistic Research Black Box and about twenty SR HFTs.  I was skeptical about both of these products, but I found them surprisingly effective in improving vocal articulation which was a real problem in that room.  It was so bad it was hard to have a conversation much less enjoy music.  Even my wife, who is a complete non-believer in such things, was really impressed by the difference.    However, I evaluated them upstairs in my dedicated living room, and the SR products did absolutely nothing there.  So, if you try the SR products, make sure you have a 30 day return option.  

Finally, I picked up a Lyngdorf 2170 for use in the living room, which offers some very effective DSP using Room Perfect.  It is a really nice piece.  Not what I would have expected from a class D amp at all. 

There is more than one way to approach this.  In a dedicated room, I'd go traditional room treatment.  In a living room, I'd start with DSP and go from there in order to avoid or minimize panels and traps. 

Your vaulted ceiling is most probably a plus !!!!
do a mix of Diffuser and Absorbing, I love the look and performance of Vicoustic and RPG products but the DIY route can be quite effective 

have fun, enjoy, experiment and listen :-)

Have you looked at Acoustics Insider? lots of good info

http://arqen.com/acoustics-101/room-setup-speaker-placement/

This is a fantastic tutorial. He provides all the info required to make your own treatments. :-)