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Conclusion:Inserting a mono TS plug into a stereo TRS jack will short the right audio to the sleeve ground, resulting in mono playback with only the left channel present. Audio from the right channel will be lost. This practice may also present a risk to the line level source.Using a conventional off the shelf stereo to mono adapter combining the ring and tip (right and left) audio from a stereo source into a TS plug typically preserves audio from both tracks, however, sound quality may be lost due to the way the audio is phased. Some sensitive audio line level sources may also be at risk when combining left and right audio.The most ideal solution is to use a powered device to combine the two stereo channels into a single mono channel, such as a mixer.