A well tried method which includes been used over a long time frame for the acoustical design of a custom home cinema system is to build a smaller style of the cinema room, in mind which is similar to the original room, at 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 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 absolutely necessary to utilize sound waves for the house cinema model measurements. More profitable may be the use of light as an alternative 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types of dedicated home cinemas are actually an extremely useful tool for the acoustical design, they are being superseded gradually by way of a cheaper, faster and much more efficient method, namely by digital simulation of sound propagation in enclosures.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 probably 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 and other working spaces as well.
Basically, there are two methods of sound field simulation in use nowadays, for home cinema designs; namely ray tracing and the technique of image sources, and both derive from geometrical acoustics. The most tedious and time consuming part of the whole process may be the collection and input of room data like the positions and orientations of the home cinema’s walls and their acoustic properties. One can study the combined effect of several source, and take into consideration all home cinema speakers together. This permits home cinema designers to determine the optimal configuration of a speaker installation in a house cinema system.
There are several computer based programs available today. They do not all guarantee exactly the same accuracy, so it is around the house cinema designer’s experience to choose which one computes better and reliable results. The computerised design of a house cinema room can be a big benefit; the program operator has the ability to alter things and achieve a smooth and pleasant result for the home cinema ‘s seating area. It really is done before the home cinema installation and may achieve great acoustical final results.