2.1 channel speakers has an additional subwoofer channel (3 speakers in total). Typically source material isn't in 2.1 format, it's in 2.0 (or plain old stereo). The low frequencies are sent to the subwoofer by a filter or sound processor in an amplifier. 

 buy 2.1 channel speakers india,2.1 speakers with bluetooth, 2.1 speakers for sale chennai,klipsch 2.1 review, paradigm 2.1 channel speaker system,cheap 2.1 speakers india, best budget 2.1 speakers india, 2.1 ch speaker taga harmony, 2.1 channel speakers

Paradigm SoundTrack 2 System 2.1 SoundBar with BlueTooth & Wireless Sub - Wireless Sound Bar - Jamsticks