How Does audio conferencing Work
Home Theater Audio - What's Multichannel Audio?
"Hi-Fi" and stereo were the big things for audio enthusiasts decades ago. Many people even bought vinyl records of sound effects just to marvel in the fidelity and stereo effects. Quadraphonic sound was tried for a while, but systems were expensive and recording and media required 2 additional channels. During the last decade digital audio makes even more sophisticated systems not only possible but also affordable.
Multichannel audio, Dolby, and THX
Stereo uses 2 recorded sound channels to feed a left speaker along with a right speaker, roughly akin to our left and right ears. Multichannel surround sound processes additional channels to enrich the audio experience with additional speakers. There's various kinds surround sound. The first utilizes a fixed listener location 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 for an audience-wide experience. Each speaker feed is called a 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 through a succession of small steps. Just about the most recent is Dolby TruHD. This provides loss-less encoding (no information lost, no noise added) of 8 or maybe more channels.
You may have read about receivers boasting about THX. THX is not actually a recording, encoding, or multichannel surround sound technology. It's actually a quality standard and certification system. Originally used for movie theaters, it "guarantees" high-quality multi-channel sound.
5.1 Channel Systems
The most common arrangement today uses 6 speakers, and is also referred to as 5.1 channels. The ".1" channel is for a sub-woofer dedicated to powerful really low frequencies. A good sub-woofer is particularly important for movie and video game special effects. Two of the rest of the speakers are the standard stereo speakers. Another pair can also be stereo, but these "rear" speakers they fit behind the listeners. So you literally are surrounded by sound. The final speaker is really a middle speaker, placed between the front stereo pair. Ideally, it's mounted fairly high to provide a broad sound experience.
7.2 Channel Systems
Add 3 more speakers and you have a 7.2 channel system. Many current receivers is only able to handle 5.1, so make sure you choose one that can handle the 9 speakers in order 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 comes from placing them in the front above the main stereo pair. Here you'd put the middle speaker a bit lower. You can also position them further to the left and right from the main stereo speakers. Finally, they are utilized as remote speakers in a 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 for the rear speakers to ensure that they're not too visible, but wireless speakers are available if this is an excessive amount of trouble. Either way, it's worth the effort. Installing a property theater surround sound system will lift up your music listening, movie watching, and also video gaming to a totally new level.
Just thought you might be interested in reading this guide: home theater installation and home theater installers.
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