Can your PC play audio without any addition of components? If that’s the case, you already have a sound card. It is a fact not all PCs come equipped with a sound card that generates the audio you’re looking for. For example, if you use your PC as a music player, gaming system, or home theater, you’ll want an audio card with 5.1 surround sound capability. 5.1 is another way of saying five speakers and a single sub woofer. A sound card designed for 5.1 is built to send individual signals to each speaker, creating portions of an overall sound.