In a portable computer, the audio speakers are incorporated in the machine and rarely produce particularly satisfactory sound. On modern portables there is usually an 'Audio Out' socket, designed to take a miniature 'jack' plug leading to small, passive speakers designed for the purpose that one can acquire separately. These are usually inexpensive and often give a surprisingly acceptable sound. The standard PC loudspeakers come as a pair, linked by what is often a slightly too sort length of cable. Depending on the quality of manufacture, they may have independent volume and/or tone controls. One loudspeaker will also have the miniature 'jack' plug that belongs in the socket at the back of the computer and the mains power cable attached to it. Although they are usually included in the package deal when you buy a PC from a reputable seller, you can easily purchase some very cheaply in almost any computer store. Of course you can use these with a portable computer too, but only if you are prepared to stay put near a power outlet, which rather defeats the purpose ;-) A 'home theatre set of five small speakers and a larger 'subwoofer' can be acquired easily, and often quite inexpensively, these days and makes a world of difference to the listening experience but only if your equipment contains a sound cardor other device that allows the system to be used properly. Computer operating systems include volume controls designed for the range of sounds packaged within them and new sound cards are usually accompanied by software that includes more than just the drivers needed to run them. Some of them include quite fancy 'graphic equalizer' emulation software, allowing the user to tweak all aspects of the sound produced. | 
