Reference material of the SAE institute
One should study this site, and all menu items, before building any kind of studio. It contains lots of info belonging to the education of Audio Engineers in relation to Room Acoustics, Studio plans, Slat timber Helmholtz resonators and much more. It is the central free available on-line info of the SAE institute
SAE Institute itself
SAE is the largest Institute for Audio, Multimedia and Digital-Film education worldwide. They have schools in 28 countries, spread over 4 continents.