Almost every computer today comes with a speaker jack, all you have to do is plug in your headphones, and you're ready to hear music. Now, if you're looking for some more quality or volume, things get a little bit more complicated, your two choices generally include plugging in a USB sound device or you can slide a soundcard into a slot that is in your computer.
Almost all sound cards have a line out jack, this is where you plug in your headphones, they also come with a line in jack that lets your PC record things like music. You can get MIDI, which stands for musical instrument digital interface, to use this you run a cord from your music synthesizer to your soundcard, this gives your PC, the ability to tell you synthesizer what sounds to make. Then there is Dolby 5.1, this is a system with a total of six different speakers, these help you to create a home theater quality sound. You can even get subwoofers, these are large speakers meant for playing bass, this is most effective when drums or explosions are involved. Finally, there amplified speakers, these are speakers with amps in them, you can tell if you have these speakers because they need a power source to run them.
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