Created on 07.12.2006 19:11.
Updated 05.04.2015 11:42.
When purchasing and installing home theater components, consider the following factors:
Full five-channel sound can be enjoyed using a DVD player or digital satellite TV system. Since only they support the Dolby Digital format.
When using a VCR as a source, you can get at best sound format Dolby ProLogic, in which two-channel audio is transmitted to a decoder and divided into 4 channels (left, right, center and surround). When using the format Dolby Digital channels are not mixed on the media, in addition, in the system Dolby Digital, there is an independent channel for transmitting low-frequency information for the subwoofer.
The power output of an amplifier is not always an indication of the volume level of a home theater system. Loudspeakers have the same effect on volume as an amplifier. One of the most important indicators of the loudness of home theater speaker systems is the characteristic sensitivity level parameter. Decreasing the sensitivity by 3 dB requires doubling the input signal power to maintain the same volume. In order to ensure the same loudness level for acoustic systems with a sensitivity of 80dB and 92dB, in the first case, an amplifier 16 times more powerful is required. The choice of amplifier is also influenced by the presence of a subwoofer. When using a subwoofer, power requirements are reduced by about 20%.
The optimal distance between the viewer and the TV (or other monitor) is 3-4 times the diagonal of the screen. Position yourself so as not to move away from the centerline of the screen by more than 15 degrees. The more light in the room, the worse the image will be. Ideally, the side walls and ceiling of the room should be painted in dark colors. It is recommended to put a carpet between the audience and the screen, which will absorb the reflections of sound waves from the floor. This will improve dialogue intelligibility and sound quality. The side walls should, like the floor, absorb sound waves. To do this, you can force them with furniture. The back wall, on the contrary, should reflect sound to enhance the surround effect.
Poor-quality rear speakers will distract the viewer’s attention and spoil the sound of the entire system as a whole. Ideally for digital systems Dolby Digital and DTS the rear speakers must be of the same quality as the front speakers.
To obtain an even sound image, the distance from the viewer to the front panels of the front and center speakers should be the same. The distance between the speakers is usually 2.0-3.5 meters, and the distance to the viewer should be equal to this value or slightly more. It is not recommended to place the speakers close to the wall, because this will lead to excessive bass boost (booming). Typically, manufacturers recommend moving the speakers 1.0 to 1.5 meters away from the wall. If this is not possible, then you need to move them at least 30-40 cm. You can try to move the home theater speakers, turn them towards the viewer and determine the position in which the sound was more pleasant and the bass was distinct.
The tweeters (tweeters) of the front speakers should be at the level of the viewer’s head; the imaginary lines drawn from the front-facing home theater speakers must cross in front of the listener.
The rear speakers should be bipolar (the radiators should be on different sides of the speaker cabinet). The tweeters of the rear speakers should be approximately 50 cm (or slightly more) above the viewer’s ear. Rear home theater speakers should be positioned so that the imaginary lines drawn from the speakers intersect behind the listener’s head. Dolby Digital and DTS).
General recommendations for equipping a room for watching movies are as follows:
- the room should be moderately muffled and have a minimal effect on the sound sound
- sound insulation should exclude the influence of external noise sources, and the sound of the system should not disturb others
- the room should be provided with comfortable conditions that do not distract from the viewing process
- for good sound insulation and noise suppression, it is best to choose a separate room intended for conversion into a home theater.