There are dual woofers and tweeters for the back and front, with passive radiators along both sides. Additionally, it offers Stack Mode, which helps you to pair with any other Middleton, Emberton II or Willen speakers nearby to expand your listening practical experience. Once you purchase through links on https://www.bluetoothspeaker.top/excellent-sound-waterproof-party-music-player-portable-wireless-bluetooth-speakers/