Non-directional bass allows you to put the subwoofer under your desk or even next to your desk without any distortion of sound or reduction in sound quality. Magnetic shielding allows you to put the speakers next to the monitor without causing magnetic distortions to the picture and damage to the picture tube. Other electronic devices could also be damaged or changed by being placed near an unshielded speaker, so this is a very important feature. Matched Frequency Response gives better sound and tonal balance and may not be present in speakers bought separately. You should but speakers in a set that shows matched frequency response as a feature.
Small footprint is important where desk space is involved.
Many people have their computer, monitor, mouse, track ball, and many other computer devices on their desk. The speakers become another problem for the desk to carry. A high-powered sound system can come in a small footprint speaker. Volume controls on the front of the speaker make changing the volume easier. Wired volume control helps users place the volume control near the keyboard or in another convenient location.