Thank you for reply.
My question is “do I have to use Camera Adapter when I can directly connect iPhone to DAC by Lightning-USB A/B?”
From my basic understanding, less device, shorter case should sound better. So, using camera adapter (more device), so making the total sound travel distance longer(longer) seem counter-intuitive.
I thought that one of followings might be the reason.
1) due to certain Apple’s certain technical restriction, I can’t simply use a cable alone to bypass apple device’s internal DAC
2) Camera Adapter has some sort of sound enhancing device.(?)
Have you tried connecting Apple device to external DAC without using Camera adapter?
In case of Dragonfly type DAC (Audioquest) I can see why I need a camera adapter simply to avoid error message. But in case of other self-powered external DAC, I do not understand why I need to go through camera adapter kind of external accesory.