Computer speakers are sold in sets, unlike a traditional stereo, which is sold piece by piece. That means that there’s an array of terminology to know. The most important is a number you may see on computer speakers, like “5.1” or “2.0.” Those don’t refer to quality, but simply the number of speakers. The first number tells you how many satellite speakers you have, and the second number, after the decimal, tells you how many subwoofers you have. So a 2.1 system, which is quite common in computer speakers, has two satellite speakers you put on your desk, and one subwoofer you place on the floor. A subwoofer adds a lot of extra bass, but you may not need it—or have space for it.