Shasha, I apologize for the inconvenience you have had with the inconsistent sound volume. Please try adjusting the following Settings to improve your experience. The Auto Volume function automatically adjusts the sound to a certain level when changing channels or switching to another external input. Go to Settings > All Settings> Sound > Expert Settings > Auto Volume = On. You may also want to perform a Sound Test under Support > Self Diagnosis > Start Sound Test. If the issue persists, please reach out to us so that we can provide further troubleshooting. You can call us at 1-800-SAMSUNG, 8 AM - 12 AM EST, seven days a week. Our LiveChat agents are also available by clicking on the ‘Support’ link on our website. ~ Samsung Pro

Suboo, We appreciate your review of the DU6900 TV. To learn how to use your Samsung remote and understand the settings on your TV, please use your remote to access the remote guide. Go to Home> (left directional button) Settings> Support> Remote Control Guide. If you need more help, Samsung is here for you. Please call us at 1-800-SAMSUNG, 8 AM - 12 AM EST, seven days a week. Our LiveChat agents are also available by clicking on the ‘Support’ link on our website. ~Samsung Pro