When connected to the Presonus STUDIO 24, the headphones only produce sound from the left side (although it sounds beautiful), but there is also the Presonus STUDIO 24C, which produces sound correctly from the left and right. I don't know the cause. I have uninstalled and installed the driver many times, but only the sound comes from the left side. I'm in trouble because I'm listening to You Tube and MP3. It works except that there is no sound from the right.