Room Treaments - Where To Begin...

15 years ago, the realtor had a funny look on his face when I was walking around the new house, with furnishings, and occasionally clapped my hands or even whistled. Before the wife moved in, I was able to try out a few arrangements for speaker placement and a listening position as well. Paid off as good as it could given the circumstances. 

 Now days, when she leaves for work, I can adjust the furnishings in the room to better suit the result.

It is more difficult to correct what you haven't yet measured/heard.

  Now wouldn't that be a cool job and quite a challenge. "What? I didn't hear anything."

surfmuz,

This is a question of room acoustics, not soundproofing a room. Two different topics.

surfmuz,

  There may be a splitting of hairs here. Let's ask the OP to be more exact about the question or provide more information pertaining to his situation.

 I do see the relevance of your response, as some do want to 'insulate' their listening experience from nearby neighbors.

surfmuz,

Now there is something that I have never considered. You are correct. Makes me wonder how live outside concerts have to deal with since they can't keep the sound 'together?'. It also reminds that when I was young and playing in a marching band, it could be difficult hearing other instruments as you marched or turned in step.

  Appreciate learning about aspects of a subject not yet considered.

oldhvymec,

  Another point to consider. Just what can you get by with in the way maybe slightly opening a window with heavy curtains hanging before it? It could go on forever, but still I wonder. I do have a small coat closet in my listening room packed with the usual stuff. Even that would cause a difference when its door is open or shut. 

  Used to have a set of ceiling tiles Hinged together about the room. Just an experiment, yet the results were undeniable for better or worse depending on placement.