The DE-DA2012DJ3 2-sub 12-inch standing speaker has four 12-inch subwoofers and two 1-inch tweeters. The sound power of this speaker is 80 x 2 watts. The subwoofer of this speaker is an active type and has an internal amplifier that amplifies the sound and increases the sound quality. This model is capable of playing MP3 audio files and has Bluetooth.