The famous Cardas Room Setup Guide
The following guide was written by George Cardas about 30 years ago,
and
has been preserved on the Cardas website ever since.
We are not able to provide further guidance on this topic, however here some
links for a deeper dive into the world of room design & setup
The Pros: Acoustic Sciences Corporation
Free advice & discussion:
https://www.gikacoustics.com/acoustic-advice/
https://www.acousticfields.com/acoustics-forum/
https://www.audioasylum.com/forums/rives/bbs.html