“My DAC amp has a USB-B port in the back.”
First thing, the USB-B port on your DAC designated as digital input or for service updates?
The lightening to USB-B cable (if you can find one) does not support audio or video output, so your iPhone will not output any audio to your DAC.
First thing, the USB-B port on your DAC designated as digital input or for service updates?
The lightening to USB-B cable (if you can find one) does not support audio or video output, so your iPhone will not output any audio to your DAC.