I do however have many years of practical experience and my opinion is based on that. Small Recording Studio Room Acoustics and Helmholtz Resonators Trying to build an effective small recording studio can be a frustrating experience because of acoustical problems. Things just don't seem to sound right. Recordings seem to sound muddy or cloudy. A primary reason for this is the tendency for rooms with small dimensions to have severe coloration in the mid bass or upper low frequency region.
Coloration is a result of standing waves or resonances in a room.
Unfortunately smaller rooms have dimensions that favor standing waves or resonances that are right in the fundamental range of voice and many musical instruments where our hearing is much more sensitive and critical than at lower frequencies. Also unfortunate is the mistaken belief that the use of materials such as foam acoustical tiles and fiberglass can solve these coloration problems. The worst coloration problems are caused by frequencies around 300 Hz and below. In smaller rooms the most noticeable build up often occurs between about 100 and 300 Hz. While foam tiles and fiberglass are excellent absorbers at higher frequencies they become increasingly less effective below about 1000 Hz.