Speakers and Sub Woofers

Speakers and subwoofer is a type of output device which provide audio output or audio information. Subwoofer is also a part of costly sound system that gives BASS effect. E.g..2.1 ,5.1 and 7.1.
Speakers are connected to the line out port on the sound card. Some speakers sets permanently connected to each other. Others speakers sets are connected by the user to each other or to a subwoofer. A cable runs from one of the speakers to the line out port to connect both speakers to the computer. If the card it is color-coded, the speaker port will be green or lime. The port might be marked with line out, spkr, speaker, or have a marking indicating the direction of the audio (out).
The subwoofer get its power from wall outlet or UPS.

There are different types of sound system are,
a) 2.1 -Two speakers and one subwoofer
b) 5.1 -Five speakers and one subwoofer
c) 7.1 -Seven speakers and one subwoofer

Note:
           Normally 2.1 sound system can kept in the order of ,subwoofer at center and two speakers at two sides of system. Like wise 5.1 and 7.1 sound system subwoofer at center and speaker at each corners of the room to get  theatre effect. 

                                                           
                                                              2.1 SOUND SYSTEM

                                                                  5.1 SOUND SYSTEM

                                                                7.1 SOUND SYSTEM