Wayne Parham Messages: 18723 Registered: January 2001
Illuminati (33rd Degree)
Be careful when choosing contractors to build a sound room and/or treat an existing room and setup. Experience and ability varies a great deal, but of course, they'll all represent themselves as experts.
I would strongly suggest that you take time and learn acoustics and setup your own room. This allows you to be sure you are getting what you paid for, because you decide what treatments to install and where to put them. You can also do it incrementally, making improvements as you can afford them.
Study room modes and the reverberent field, for starters. These come into play at different frequency ranges, room modes at bass frequencies and the reverberent field at higher frequencies. You'll want to address each of these differently.