I got a 6.35mm to 3.5mm M/F audio adaptor several days ago. When I installed the UR22 mkII and used the adaptor, I could only hear the sound from one channel (only my left ear could hear the sound). Are there any preferences of the brand and features of the headphone adaptors? Thank you!!
Are you sure you purchased a stereo to stereo adapter? Maybe it is mono. You can physically see the difference. Look at the male end. If it is a TS connection (tip/sleeve like a guitar cable has) it would be mono and, most likely you would only hear from the left side. If it has a TRS (tip/ring/sleeve) connection it would be stereo. Google “tip ring sleeve” for some further explanation.
Regards 