@Artemus, the hat channels on the ceiling is for decoupling. They are mounted on sound clips which assures no transfer of vibrations caused by low frequencies through the ceiling. The walls did not need them since we did the offset stud method to accomplish the same. Meaning the inner walls do not touch the outer walls except a little at corners and edges.

@cymbop, in 3 words you laid it out perfectly. Room, treatment, gear.

Beautiful project you've pulled off there, @baylinor .

BTW, What is the purpose of the hat channels with the wooden framing? Just curious.

Love for music is never enough!

Again my best compliments!

My AC guy wouldn't be interested in shipping these, if he has any left, since he makes most of his money on the install. You can get these online from many suppliers.

The model is probably a couple years old. The AC guy had a good deal on it and bought a couple dozen. They have now a newer unit which saves even more power wise. Either unit you get, those things are amazing, way quieter than the noise you hear from a vent when a central AC unit is on. The thing is set on 74 in 100+ degrees in Texas. The thermostat is on a remote control. Never hear it from my seating position EVER. Obviously much superior to central AC for a single room. Only added $20 a month to my bill. Great insulation though...

Well done effort. My only comment/critique/suggestion is... verify just how much your 2 windows are effecting the sound. I have 2 windows in my room, thought I had them handled via absorption placed and such, then I noticed I had a cheap stethoscope, so I grabbed that and put on some music pretty loud and listened to the window, which is a bit tricky because you're in a room with loud music, but lifting it on and off the glass gives you perspective.... My windows turned out to be quite evil, likely because of how they are mounted to the cinder block building. The resulting improvement was major. So, get a cheap stethoscope for like $5 and see what the sound of your windows really is. If it is making higher pitched than the music noises or screeching noises... I stuck some 2" 30 Duro Sorbothane pucks on the glass and that slowed it down to non-damaging. Cheers.

The mini split is a Daikin 12,000 btu unit. Goes for $1,200 + $800 install. There is an inside and outside unit and it is fairly complicated to do on your own. It is more than sufficient to cool down my 27,000 cubic ft. in a matter of minutes. And you basically can never hear it unless you are right next to it. Amazing unit. My AC guy said I would love it in a music room and he was right. I thank you for your gridfusors suggestion for the front wall. As you may have noticed I have two small windows in that front wall and that would be a no no to any serious audiophile. But I didn't care, I need those windows to view the many beautiful trees in front and relieve me of the claustrophobia I would feel staring for hours at a plain wall. Hence the art work also. That to me is more important than any small sound improvement I may hear from treating the front wall. Something very interesting happened, the TV is mounted on a stand rather than against the wall, and what I found out is the lead vocal would disappear BEHIND the TV. After trying different options, I installed a 4" thick open cell piece of foam about the size of the TV right between the TV and the wall, and magically the lead vocal placed itself in FRONT of the TV. Now my soundstage is perfect to my ears. Another thing is I maintain a great balance between a dead room and a live one because I ordered my 8 bass traps with limiters, therefore it does not absorb high frequencies, just low ones. And with my carpeting it is just what the doctor ordered. Like you say, there was a lot of homework going into this. Thanks a lot to take the time to give me your input. Very much appreciated.

Wonderful space!!  So its a separate "building" from the house it looks like?  Can you provide details on the split AC unit? 

You've done your homework on the construction and room acoustics, well done - the room is prob the most significant "piece" in this hobby, one which I personally am very much into (acoustics).  One thing I will mention FWIW on the acoustic side, some QRD type of diffusion on your entire front wall would be something to explore if you ever have the itch.  GIK gridfusiors are inexpensive (comparatively speaking) and work really well.  Also covering the TV or better yet throw two or three 244 broadband in front.  Anyway, great job. 

I love the yard too!  Mowing close to ..8 acre and all shrubs, irregation etc.. is getting old for me.  You have my dream yard, rocks, lol!!

:)