Hello. As I'm a firm believer that room acoustics plays a great part in how good a system could sound, I've hired an acoustic firm in my country (from the very, very few that actually exist) to treat the room in my house where I have my stereo, at one side and my HT at the other side. Is a room I've dedicated in my house to for that matter and I only use it a night when my daughter is asleep. It's not a perfect room and there are some parts that I just can't modify. One part is a closet I have on the right side and the other parts some windows and a door. They are offering me to change the door to an "acoustic" one and also the windows. I'm showing you some photos of the renderings they made and what could be the result. They are charging me $6,000 including the "acoustic" sealed windows at $1,500. I'm willing to spend that money for the sake of having a good sounding room, MY FEAR is what if they are only focusing on absorption of echoes? Any questions I should ask them? They came to my house, did some measurement with a "gun" they shoot at the floor while the other engineer held a special mic that has a display, and they show me an eq graph and the problems of echoes I had. They are specialized in treating recording studios, music halls, etc but just a few individual rooms like mine. That's understandable because not many people would like to pay that much just for having their room treated, heck, most of the people wouldn't even pay $6,000 for a home stereo but I guess there a very few audiophiles and music equipment lovers in my country. Anyway, I would love some comments and insight from you including suggestions and questions I should ask them. In my ignorance, as the engineers made special emphasis on the echoes, I fear they could be letting aside other factors that should be corrected apart from the echoes. That's why I think the photos of what they propose should help. They are using PVC, fiberglass and the windows are made from hermetically sealed double-glazed. Excuse the translation from Spanish to English LOL. Thank you a lot!!!