If you are plugging your headphone output of your phone or MP3 player directly into a mono input on your mixer, audio interface or active speaker by using a TRS adapter or cable, then you may notice the audio does not sound correct. You may hear loss of vocals, weaker bass or bad levels of distortion. This is a phasing issue - a result of supplying your mono input with a stereo signal. In this video, we explain that such problems can easily be avoided using a specific cable type in conjunction with two mono input channels. The cable type you would need is a '3.5mm TRS to 2x 6.35mm TS’ stereo breakout cable.