A:Answer Hi JinC. To control the volume of the treble or bass sound, press the TONE CONTROL button and then adjust the volume between -6 to +6 by using the Up/Down buttons.
Press and hold the SOUND CONTROL button for about 5 seconds to adjust the sound for each frequency band. 150Hz, 300Hz, 600Hz, 1.2kHz, 2.5kHz, 5kHz, and 10kHz are selectable using the Left/Right buttons and each can be adjusted to a setting between -6 to +6 using the Up/Down buttons. (Make sure the Sound mode is set to “STANDARD”.)
Press the CH LEVEL button so you can adjust the volume of each speaker. CENTER LEVEL or TOP LEVEL can be adjusted using the UP/DOWN buttons from -6 to +6.
~ Samsung Support