The Wonderboom 4 provides a purely natural harmony of bass to midrange to treble, which implies no instruments or voices are unnaturally boosted. For all 25 speakers we tested, the average battery life was a little bit under seventeen hours. The Sony Ult Subject 7 wins the title for https://www.bluetoothspeaker.top/professional-magnet-stereo-surround-music-wireless-bluetooth-speaker-for-car-bass/