The inner gear also permits a complete range of EQ controls. From the Marshall app on your phone, you are able to make a number of adjustments to have the sound you wish. Around the speaker itself, You should use the brass control panel to adjust bass and treble. https://www.bluetoothspeaker.top/rgb-bluetooth-5-0-speaker-with-stereo-sound-bass-support-tf-card-aux-waterproof-speaker/