To use the Bose LT 6400, first connect it to a suitable audio source. Place it in a position where the 60° x 40° coverage can best reach your audience. Make sure the audio source is powered on and adjusted to the right volume. When not in use, keep it in a dry and clean place. Wipe it with a soft, dry cloth regularly to maintain its appearance. Avoid exposing it to extreme temperatures or humidity, as this may damage the internal components.