Do Lightning adapters affect sound quality?
Another great feature of the adapter is its dual use. You can connect your headphones to the 3.5 mm jack and charge your iPhone at the same time. We tested this adapter with iPhone 8 Plus and Sennheiser HD280 Pro Headphones. We found no change in the sound quality of the headphones; seriously, no change at all!
What is a Lightning audio adapter?
This adapter lets you connect devices that use a 3.5 mm audio plug to your Lightning devices.
Is there a DAC in the Lightning to 3.5 adapter?
Since the Lightning port is digital-only, the Lightning to 3.5mm connector must contain a Digital-to-Analogue Converter (DAC). Since the sound quality will depend largely on this DAC, how does it compare to the DAC contained in the iPhone and used traditionally for the headphone jack?