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=== Theory of Stereo Mono Conversion ====== Theory on Stereo to Mono Conversion ===Shorting leads to create a mono signal has been used for the past 50 or so years with headsets. The stereo plug has a tip, ring and sleeve section while a mono headset will have only a tip and sleeve. When the mono headset is plugged into a stereo jack, both ring and sleeve contacts the sleeve section of the mono plug thus combining the two channels into a mono signal.To combine the ring + tip or to short the ring to the sleeve, that is the question. According to one source, shorting leads to create a mono signal has been used for the past 50 or so years with headsets. The stereo plug has a tip, ring and sleeve section while a mono headset will have only a tip and sleeve. When the mono headset is plugged into a stereo jack, both ring and sleeve contacts the sleeve section of the mono plug thus combining the two channels into a mono signal. According to another source, the flaw of the TRS TS design is that when a mono TS plug is inserted into a stereo TRS jack, it shorts out the right channel to ground, simulating a 0-ohm load. This could be harmful to some equipment (burn out your iPod).