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Check the settings on your lav mic system to see if you mix down the two channels into a mono mix. Otherwise, you may need to use separate inputs for each channel.
If problems persist, please elaborate on the audio settings that you are using on the camera.
Hi and thanks for your reply. For some unexplained reason, when I switched to my other system which is the Saramonic UWMIC9 dual wireless lav microphone, this has the ability to output sound equally to both the left and right earbuds! So I am very happy about that. I don't know why my Comica dual wireless lav system can't do the same but instead only outputs sound coming out of the same earbud for both transmitters. Even though the audio settings are the same, the Saramonic system works but not the Comica system. Again, I don't know why. I made a video about this if anyone cares to view this, link here: <link removed per Forum Guidelines>
Update: I figured out how to output the same audio into both left and right earbuds. But I had to use my Saramonic UWMIC9 dual wireless lavalier system, as the Comica system did not work. I also recently ordered the new Rode Wireless Go II dual wireless lav mic system (2nd version) that has many new features including the ability to output the same audio into left and right earbuds at the same time. So far I'm really liking my new Canon XF400 camcorder and I've tricked it out with both the Audio Technica AT875R shotgun mic into the top handle mic holder into Input 1/Channel 1, plus the Rode Wireless Go II wireless lav mic system into Input 2/Channel 2. The Canon XF400 top handle audio feature is very slick for advanced multiple mic recording setup, whereas my Canon G60 lacked this feature.