Home Cinema Acoustic Treatment
|The sound that you hear in a room is far more influenced by the placement of yourself, the placement of the speakers and the acoustic performance of the room's surface and contents than it is by the quality of the speakers and electronics.|
Because the front wall immediately receives the omni-directional low frequency sound from the bass speakers, it typically needs to be covered with at least 100mm of thick absorption such as nested Profoam Panels or even better Abffusers, or even better Modex Bass Traps. Corner mounting Bass Traps should be mounted in the wall / ceiling or wall / wall corners. Try to position the screen at least 300mm into the room so that there is space for acoustic treatment behind it.
The rear wall is usually treated with some kind of exposed or concealed acoustic diffuser system to uniformly diffuse sound across the listening area, thus heightening the surround sensation. If possible the listener should be seated at least 1.2m from the rear wall. Additional low frequency treatment can be placed below and surrounding the diffusers if necessary. The best diffusers for the rear wall are Diffractals although Skylines or Omniffusers are also suitable.
Left / Right Walls
The front of the room, from the screen to the first row of seats, should ideally be a mixture of absorption and diffusion which can be achieved with Abffusers or B.A.D. Panels, typically 100mm in depth. The rear side walls are usually made diffusive, so that the surround channels can be uniformly diffused. This can be accomplished with Diffractals or FlutterFree Strips in a Helmholtz mounting (i.e. off the wall). For lateral low-frequency modal control a thick bass absorbing system can be included above and below the diffusers if necessary. For lateral modal control, side wall Modex Traps are important.
The ceiling should ideally be diffusive, using Omniffusors or Skylines, or at least mixed by utilising BAD Panels. Typically Omniffusers are used when there is the possibility of using a heavy duty ceiling grid. If a lightweight surface treatment is required then the Skylines would be the better choice.