The Problem With 3.5mm Microphone Inputs
Above you will see our Deity Smart Cable with numbers along the jack. We at Deity use 3.5 TRRS jacks on all of our V-Series Microphones. This way we can adapt our TRRS automatically down to a TS, TRS, or another type of TRRS.
The problem in the past has been some manufacturers, like Sennheiser, wiring their audio transmitter with what’s called the Standard Pinout. The tip (1) on their devices is the one that supplies the 1-10v bias power to the microphone. But companies like Sony choose to put the audio/bias voltage on the Ring (2). While other companies like Azden, with their latest wireless kit the Azden Pro-XD, choose to make their microphone jacks TRRS and put the bias voltage on the Sleeve (4). DSLR and other manufactures that add stereo 3.5mm jacks to their devices often put bias voltage on both Pins 1 and 2. Now let’s add headset jacks to the mix where a few of the pins are used for speakers and the ground wire is shared with the microphone’s return. Plus you sometimes will find cellphone and laptop makers putting the bias voltage on Pin (3) OR Pin (4). And sometimes the same cellphone maker will do it differently across their various devices.
If you find this confusing you aren’t alone.