Is room treatment a science?

The above suggestions have schooled me. Your explanations have been tangible and easy for me to understand.

Thank You!

Another vote for GIK Acoustics and their invaluable advise. They have wide variety of Acoustic panels, basic panels are inexpensive and well made. IMO, they far outweighs the DIY panels. I did my room in two phases and couldn’t be any happier with the results.

As others have pointed out, start with basics and then add more later, if needed.

Mr Squires nailed it.   "I will say after lots of measurement and experimentation that treating your room well is never a mistake." 

Room is part of the system. For me the largest and most revealing improvement in SQ came from treating the room.  

I gotta do room treatment next.  Prolly be a year or two but gotta do it, methinks.

Yes of course acoustics is based on science and nothing else.   Lots of good books on how to tackle it correctly. Applying it to a specific room to achieve a specific goal is the challenge.