The inner gear also permits a full range of EQ controls. From the Marshall application on your phone, you are able to make a number of adjustments to find the sound you wish. Around the speaker itself, You may use the brass control panel to adjust bass and treble. https://www.bluetoothspeaker.top/bluetooth-speakers-colorful-sound-with-rgb-light-stereo-speaker-wireless-speaker-with-led-light/