A well tried method which includes been used over a long period of time for the acoustical design of a custom home cinema system is to create a smaller style of the cinema room, in mind which is like the original room, at the very least geometrically, and to study the propagation of waves in this model. This method has the advantage that, with little expenditure, a great number of variations can be tried out: from the choice of various acoustic wall treatments to major changes in the shape of the home cinema room.
Since several properties of propagation are normal to all types of waves, it is not absolutely necessary to use sound waves for the home cinema model measurements. More profitable may be the use of light as a substitute of sound. The detection of the power distribution in the house cinema room can be executed by photocells or by photography.
Although physical types of dedicated home cinemas are actually a very useful tool for the acoustical design, they are being superseded gradually by way of a cheaper, faster and much more efficient method, namely by digital simulation of sound propagation in enclosures.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 merely to home cinema systems, but to factories, auditorium and other working spaces as well.
Basically, there are digital cinema 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 portion of the whole process may be the collection and input of room data such as the positions and orientations of the house cinema’s walls and their acoustic properties. One can study the combined aftereffect of multiple source, and consider all home cinema speakers together. This permits home cinema designers to determine the optimal configuration of a speaker installation in a home cinema system.
There are several computer based programs on the market today. They do not all guarantee the same accuracy, so it is around the home cinema designer’s experience to decide which computes better and reliable results. The computerised design of a home cinema room could be a big benefit; the software operator has the ability to alter things and achieve a smooth and pleasant result for the house cinema’s seating area. It is done before the home cinema installation and can achieve great acoustical end results.