ZAGROSS310 A 3-sub 10-inch standing speaker has 6 10-inch subwoofers, 2 4-inch midrange speakers, and 2 1-inch tweeters. The sound power of this speaker is 240 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.