Tenson said:You need to place the Confidence in the corners. It works on pressure changes and the corners are (as T said) where pressure is at a maximum.
The foam type of traps are kind of a contradiction, they work by absorption of particle vibration yet particle velocity is lowest near a boundary (where bass builds up!).
Good work Tenson. I urge anyone going down the route of room treatement to get a basic grasp of pressure versus particle velocity. It will stop you wasting a lot of time on incorrectly selecting/placing treatments.
As already said, foam or mineral wool type absorbers work by converting the particle velocity kinetic energy (i.e. kinetic energy of air molecules as sound wave passes through the medium) into heat due to friction effects in the material.