Monstieur
100+ Head-Fier
- Joined
- Jan 3, 2017
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The standard Lightning to 3.5 mm Headphone Jack Adapter has a mono ADC for the microphone. It's a standard TRRS connector with a microphone input. I tried plugging this into the AirPods Max but it wasn't detected at all - the Bluetooth connection remained active. I sent a line level signal on the microphone pin, but it still wouldn't take. The AirPods Max are actually detecting that the correct type of lightning cable is attached, rather than simple jack sensing.the standard lightning to female 3.5mm adapter they sell only has a DAC inside, not an ADC, and can't be used to feed audio to the APM.
The Lightning to 3.5mm Audio Cable must have a stereo ADC (assuming the headphones don't have a non-standard Lightning connector with analog input pins), and it can switch the same pins between ADC & DAC mode, unlike the other adapter.
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