Sound Violin
Home Theater Audio - What's Multichannel Surround Sound?
"Hi-Fi" and stereo were the big things for audio enthusiasts decades ago. Some people even bought vinyl records of sound effects just to marvel on the fidelity and stereo effects. Quadraphonic sound was tried for some time, but systems were expensive and recording and media required 2 additional channels. Within the last decade digital audio has created even more sophisticated systems not only possible but also affordable.
Multichannel audio, Dolby, and THX
Stereo uses 2 recorded sound channels to secure a left speaker and a right speaker, roughly akin to our left and right ears. Surround sound processes additional channels to enhance the audio knowledge about additional speakers. There's several kinds of surround sound. The first runs on the fixed listener place for a 3-dimensional audio effect. Unfortunately this means there's a single "sweet spot" where the effect works best. Other forms use speakers behind the listeners with an audience-wide experience. Each speaker feed is called a channel.
Audio processing from Dolby Laboratories began long ago in the 1960s with noise reduction. Dolby processing has evolved to multi-channel surround-sound processing via a succession of small steps. Just about the most recent is Dolby TruHD. This allows loss-less encoding (no information lost, no noise added) of 8 or even more channels.
You may have read about receivers boasting about THX. THX is not really a recording, encoding, or multichannel audio technology. It's actually a quality standard and certification system. Originally useful for movie theaters, it "guarantees" high-quality multi-channel sound.
5.1 Channel Systems
The most common arrangement today uses 6 speakers, and it is referred to as 5.1 channels. The ".1" channel is made for a sub-woofer dedicated to powerful very low frequencies. A good sub-woofer is especially important for movie and video game special effects. Two of the residual speakers are the standard stereo speakers. Another pair can also be stereo, but these "rear" speakers are placed behind the listeners. So that you literally are surrounded by sound. The final speaker can be a middle speaker, placed between the front stereo pair. Ideally, it's mounted fairly high use a broad sound experience.
7.2 Channel Systems
Add 3 more speakers and you have a 7.2 channel system. Many current receivers can only handle 5.1, so make sure you choose one that can handle the 9 speakers if you want to go with this arrangement.
The ".2" speakers are two sub-woofers, making your deep bass truly stereo. The residual pair can be used in several ways. The best sound originates from placing them in front above the main stereo pair. Here you'd position the middle speaker somewhat lower. You can also put them further to the left and right from the main stereo speakers. Finally, you can use them as remote speakers within an entirely different room.
Overall
These may sound like complicated systems, but each channel and speaker has its own purpose and place. They're not really that difficult to create. You may have to be clever in running wires to the rear speakers to ensure that they're not too visible, but wireless stereo speakers are available if this is an excessive amount of trouble. Either way, it's definitely worth the effort. Installing a house theater surround sound system will lift up your music listening, movie watching, as well as video gaming to a completely new level.
Just thought you may well be interested in reading this guide: home theater installation and cheap home theater systems.
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