The internal equipment also permits an entire range of EQ controls. From the Marshall application on your phone, you'll be able to make a number of adjustments to find the sound you'd like. Within the speaker itself, You should utilize the brass control panel to adjust bass and treble. https://www.bluetoothspeaker.top/best-selling-flip-6-speakers-stereo-bass-subwoofer-wireless-tws-speakers/