A well tried method which has been used over a long time frame for the acoustical design of a bespoke home cinema system is to create a smaller style of the cinema room, in mind which is similar to the original room, at least geometrically, also to study the propagation of waves in this model. This method has 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 types of waves, it is not absolutely necessary to utilize sound waves for the house cinema model measurements. More profitable is the use of light as an alternative of sound. The detection of the power distribution in the house cinema room can be carried out by photocells or by photography.
Although physical models of dedicated home cinemas have proven to be an extremely useful tool for the acoustical design, they’re being superseded gradually by way of a cheaper, faster and much more efficient method, namely by digital simulation of sound propagation in enclosures.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 due to 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 ways of sound field simulation used nowadays, for home cinema designs; namely ray tracing and the method of image sources, and both derive from geometrical acoustics. Probably the most tedious and time consuming part of the whole process is the collection and input of room data including the positions and orientations of the house cinema’s walls and their acoustic properties. You can study the combined effect of several 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 available today. They do not all guarantee the same accuracy, so it is around the home cinema designer’s experience to choose which one computes better and reliable results. The computerised design of a home cinema room can be quite a big benefit; the program operator will be able 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 may achieve great acoustical final results.