Stereo mode: Both line inputs, left and right, must be used in order to hear a stereo signal on the receiver. It is advisable to set the left and right line
inputs to the same level.
Mono mode: Only one line input must be used in order to hear a mono signal on both sides of the earphones.
If there are different signals on both line inputs, they are merged into sum mono signal. The loudness of the two signals is then adjusted using the