I have a Zoom H4n Pro and I am trying to connect my PC 3.5 speaker plug to the H4n Pro's XLR connections. I want to do this because I want to record voice calls. I need to use the XLR and not the Ext Mic connection because using the Ext Mic disables the voice microphones on the device and I need to use them to record my side of the conversation.
Now, to connect the PC 3.5 speaker plug to the XLR I am using these two connectors:
The sound passes through and gets recorded but with it there is a huge humming sound. I suspect the XLR is expecting an unpowered source and the PC plug is probably powered but I have no idea if this is the case or if it could be resolved by reconfiguring the H4n Pro.
Thanks for any help.