Interestingly the DAC used with those adapters is in the adapter. https://apple.stackexchange.com/questions/252779/how-does-the-lightning-to-3-5mm-adapter-dac-c

Interestingly the DAC used with those adapters is in the adapter. https://apple.stackexchange.com/questions/252779/how-does-the-lightning-to-3-5mm-adapter-dac-compare-to-the-internal-iphone-dac https://apple.stackexchange.com/questions/252779/how-does-th...