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Home Theater Audio - What's Multichannel Audio?
"Hi-Fi" and stereo were the big things for audio enthusiasts decades ago. Some individuals even bought vinyl records of sound clips just to marvel in the fidelity and stereo effects. Quadraphonic sound was tried for a time, but systems were expensive and recording and media required 2 additional channels. During the last decade digital audio makes even more sophisticated systems not just possible but also affordable.
Surround Sound, Dolby, and THX
Stereo uses 2 recorded sound channels to secure a left speaker plus a right speaker, roughly akin to our left and right ears. Surround sound processes additional channels to enhance the audio exposure to additional speakers. There's various kinds surround sound. The first uses a fixed listener area for a 3-dimensional audio effect. Unfortunately this means there's a single "sweet spot" in which the effect works best. Other forms use speakers behind the listeners to have an audience-wide experience. Each speaker feed is known as channel.
Audio processing from Dolby Laboratories began in the past 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 more channels.
You may have learn about receivers boasting about THX. THX is not really a recording, encoding, or multichannel surround sound technology. It's actually a quality standard and certification system. Originally employed for movie theaters, it "guarantees" high-quality multi-channel sound.
5.1 Channel Systems
The most typical arrangement today uses 6 speakers, and it is referred to as 5.1 channels. The ".1" channel is perfect for a sub-woofer dedicated to powerful really low frequencies. A good sub-woofer is very important for movie and gaming special effects. Two of the rest of the speakers are the standard stereo speakers. Another pair is also stereo, but these "rear" speakers are put behind the listeners. Which means you literally are flanked by sound. The final speaker can be a middle speaker, placed involving the front stereo pair. Ideally, it's mounted fairly high to supply a broad sound experience.
7.2 Channel Systems
Add 3 more speakers and you've got 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 wish to go with this arrangement.
The ".2" speakers are two sub-woofers, making your deep bass truly stereo. The rest of the pair can be used in many ways. The best sound arises 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, they are utilized as remote speakers in an entirely different room.
All in all
These may sound like complicated systems, but each channel and speaker has its own purpose and place. They're really not that difficult to create. You may have to be clever in running wires towards the rear speakers to ensure that they're not too visible, but wireless stereo speakers are available if this is too much trouble. Either way, it's worth the effort. Installing a home 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 home theater installers.
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