The inner equipment also allows for a full range of EQ controls. From the Marshall application on your phone, you could make a number of adjustments to have the sound you desire. Around the speaker itself, You should use the brass control panel to adjust bass and treble. It https://www.bluetoothspeaker.top/colorful-light-bluetooth-speaker-with-function-of-supporting-to-play-usb-tf-card-fm/