Sound quality vs. volume


Looking for a bit of expertise here:

I recently made a few changes to my setup and while overall pleased with the results, I’m on the quest for better.  I’m hoping you all can help me diagnose an issue I’m hearing.

When listening to music at lower volume levels - say less than 1/2 total volume, the clarity, imaging and dynamics come across far more coherent and “in focus”.  To use an often over-coined phrase “It’s like I’m there in the room”.  As I start to push the volume up a bit, closer to live-performance levels, the sound becomes increasingly “mushy”.  I know, a highly technical term, but the best way to describe what I am hearing.  The bottom-end loosens up - getting a bit boomy, the crispness of the mid-range and highs fade and the imaging falls out of focus.  These are all incremental with volume until I get to the point where it’s just unbearable.   

I’m no expert by any means but feel it might be room acoustics.  I already know I have a less than ideal setup with a nearly square room (21x20ft) with 60% of the surface covered with clear birch wood paneling. Some things we can’t change (easily).  I do not have any acoustic treatment, just lots of soft furniture.  What I find interesting is that my old setup (Magnepan 1.6) didn’t suffer to such a degree.  Maybe with the new setup there is more to loose?  A mystery.  

For a bit more context:  
Speakers:  Dynaudio Contour 60
Streamer: SoTM sms-200 Ultra
Amplifier: Peachtree Nova500

Within the 20x21ft. room, my speakers are 4ft. from the wall, I am seated 13ft. from the front wall (a bit back from room center). Speakers are 9ft. apart.

Any thoughts?  


wanderingmoo
Yes elliottb: "Once anyone gets a very satisfying balanced system and speaker/room setup, most often you will find you very rarely listen as loudly as you used to. You are busy being immersed, involved, hearing things previously undiscovered."  ...  ...   It is my case also, rarely I listen loud, because I focus on the details of the music, so 20% of the total power is good for me. Some times, I need to lower the volume just a bit.  The quality of the electricity is a major factor to have an easy listening session.  I also use Cathedral panel in each corner of my room.
Agree with the comments on loudness.  Very rarely do I push things 90+db.  There are those few "classics" that demand to be played loud but that's usually more of a party than critical listening.  

We are having some electrical work done in the next few months (renovation) and I'll ask if the electrician can pull a new 20amp circuit down into my listening room.  I think this, combined with some quality plugs, sockets and cables could make an improvement.  Sometimes I think the lights dim a little when I crank up the volume ;-)

In the meantime, I have have a DIY project for this weekend to build some acoustic panels and bass traps.  Placing them behind my projector screen, along the back wall and in the window bays.   
It would make sense to me that when the volume is cranked that you are experiencing frequency cancellations do to the sound reflections in the room.  If you have two opposing frequencies 180% out of phase then the original is canceled out.  At low volume it would be less apparent.  As a test by placing a couple throw rugs on the wall behind the listening area and possibly experimenting in more areas to see if that helps. 
Have here an open concept space of similar albeit a bit larger dimensions. Was a nightmare and I spent considerable upgrading power treatments, speakers, amps, cables, subs....until I surrendered and rearranged the furnishing so the AV was coming out of a corner.  OMG the radical improvement in fidelity  IE top to bottom resolution/detail/definition, 3D stage, image nuances, separation and air, and tonal shadings and overall balance. Had only I started here. YEMV by degree but I believe you will be very pleased. Aside: As it's also the main living space, sound treatment properties are taken into account with decor selection and placement decisions. Seems to provide enough diffusion, absorption and life. Namaskaram