A well tried method which has been used over a long period of time for the acoustical design of a bespoke home cinema system is to build a smaller model of the cinema room, in mind which is similar to the original room, at the very least geometrically, and to study the propagation of waves in this model. This method gets the advantage that, with little expenditure, a lot of variations can be used: from the choice of various acoustic wall treatments to major changes in the form of the home cinema room.
Since several properties of propagation are normal to all sorts of waves, it is not essential to use sound waves for the home cinema model measurements. More profitable is the use of light as an alternative of sound. The detection of the power distribution in the home cinema room can be executed by photocells or by photography.
Although physical models of dedicated home cinemas are actually a very useful tool for the acoustical design, they are being superseded gradually by a cheaper, faster and more efficient method, namely by digital simulation of sound propagation in enclosures. The introduction of the digital computer into room acoustics is most likely because of M.R. Schroeder and his co-workers. Meanwhile, computer simulation has been applied not only to home cinema systems, but to factories, auditorium along with other working spaces as well.
Basically, there are two methods of sound field simulation used nowadays, for home cinema designs; namely ray tracing and the technique of image sources, and both derive from geometrical acoustics. Probably the most tedious and time consuming part of the whole process may be the collection and input of room data including the positions and orientations of the home cinema’s walls and their acoustic properties. One can study the combined aftereffect of several source, and take into consideration all home cinema speakers together. This permits home cinema designers to look for the optimal configuration of a speaker installation in a house cinema system.
There are various computer based programs on the market today. They don’t all guarantee the same accuracy, so it is up to the home cinema designer’s experience to choose which computes better and reliable results. The computerised design of a home cinema room could be a big benefit; the software operator has the capacity to alter things and achieve a smooth and pleasant result for the house cinema’s seating area. It really is done prior to the home cinema installation and can achieve great acoustical end results.