Speakers
Magic holes that make noise.
Speaker Types
Bookshelf speakers
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Surround speakers
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Subwoofers
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Speaker Placement
You can place 'em here, you can place 'em there. Whatever floats your boat.
Near Field Listening
Speakers are placed directly in front of listener, generally 1-3 meters in front. Speakers may be placed on a desk, or may be brought out into the room with 3-4 meters behind it.
Far Field Listening
Speakers are place 3-4 meters in front of listener, generally with 1-3 meters from the back. Speakers will be tilted 10-15 degrees to line up with the listener's ears.
Speaker Configurations
Stereo
Stereo refers to the speaker configuration where the audio signal is split into a left and right channel. Thus this configuration features two speakers. The premise of stereo is that by delaying the time it takes for a signal to hit your left ear from your right, an impression of sound being heard from various directions can be made. Bookshelf speakers and floor standing speakers will cover a large frequency response by using multiple drivers tuned and designed for different frequency bands. Hence the subwoofer and tweeter is self contained in the single unit. Regular desktop speakers however tend to only offer a larger single dynamic driver which tries to cover the entire frequency range by itself, leading to lower quality and unsatisfying sound.
2.1 Channel
A 2.1 channel configuration refers to a stereo configuration with the addition of a subwoofer. This can be a fully featured stereo setup backed up by a subwoofer to add more depth and extension to the bass (cutoff frequency inaudible), or it can be a simple setup with single driver speakers and at a certain cutoff frequency (typically 3000-2000 hz) the subwoofer will kick in. This can be undesirable since it can lead to sound immediately switching between the woofer and the stereo making it noticeable in that cutoff range.
5.1 Surround Sound
A 5.1 Surround Setup allows for sound to be thrown around a room and creates a sense of being in the action. This setup is more complicated than 2.1 or stereo since it heavily relies on the acoustics of the room, meaning the placement of the speakers have to be tweaked until they have been room calibrated.
7.1/7.2 Surround Sound
Has become increasingly popular, allows more realistic soundstage.
9.2/11.1/11.2
Features Speakers Mounted on Wall and floor standing speakers
13.2/13.3/13.4
everything 9.x has but now includes ceiling speakers. effect comes most noticeable with rain or waterfall scenes where it feels like the rain is pouring on you.