ok im opening pandoras box here.(treatment vs framed wall art)

Unfortunately glass will have to go. Notwithstanding the suggestion to add SR products these will only tame but not remove the effects of the highly acoustically reflective pictures (I have a full SR ART and HFT setup originally installed in my SoCa all glass modern house which you can see in my old system description)

 I experienced just this in my new room gradually eliminating each piece of artwork and hearing the improvement at each step. I still have a window but that is itself heavily treated. There's no comparison in how good the two rooms sound

luckily manufacturers of acoustic treatments have realized that not all of us want to look at plain cloth so are now making acoustic panels that double as art, for example ArtPanels from GIK acoustics are well priced and attractive. 

+1 for GIK Acoustics.

Also, sculpture can act as diffusors. :)

If possible, remove the glass or replace with museum quality plexiglass which maintains UV protection but is less rigid, and not as good a reflector. Also, use foam behind the frames to prevent rattling from the drywall.

Avoid reflectors most of all at 1st reflection points.  However, you can compensate for too much glass somewhat with lots of diffusors and dampening elsewhere. For instance, the ceiling is often overlooked. :) 

Best,

Erik

I completley agree with all the post i have been down this road before .. I was browsing the virtual tour here and i saw systems well over 75k with pics all over the walls .. And i thought to myself how the hell is that working out yannow ... I love some pics of my favorite bands on the wall but they ring , obviously i dont mind that as much in my ht room because its more oriented toward entertaining and family ( although it has waaay more low end ) but in my dedicated audio room it is challenging . It is my personal space ( man cave ) and its where i want a pic of Genesis or pink floyd etc and at 150.00 framed uv im thinking thats about the same as a decent panel . I had a killer room years ago treated very well . But sometimes staring aimlessly at a sound panel listening to music gets old . 

Well I do not think all the glass has to go. I am very happy with a Synergistic Research treated room with the latest HFT system (there are three different types of transducers that respond to different frequencies) in concert with the Synergistic Research FEQ ( which improves bass and decreases brightness).

 In addition what wall outlets are you using?  Perhaps a darkish outlet like the Oyaide R-1 is indicated . Another possible help would be SR Black fuses and Black wall outlets. Both products decrease high frequency noise and allow the system to have a more relaxed sound.

Also consider the Synergistic Research Atmosphere device which does allow one to tune the room to some degree. 

The SR Black fuse, Black A/C wall outlet, and Atmosphere unit all come with a 30 day trial.

My listening room is decorated exactly the way I want it. As I type and listen to some fabulous solo female vocal and lute music ( Shirley Rumsey on Naxos), I am enjoying looking at a painting of Saint Celia (patron saint of musicians) which was painted about 1650.

The acoustics are wonderful. The room's visuals are inspirational.

Getting it right took a lot of effort but was worth it.

David Pritchard

How a listening room looks will effect how the listener feels which can make that person either more or less receptive to good music.  If your pictures make you enjoy the music more, then keep them and just use a little common sense about their positioning.