I had a quick glance at the CS chip. This chip can be easily converted to an audio transformer type output stage.The Lightning to 3.5mm headphone jack adapter includes a DAC with CS4272 Chip, and Apple’s chip number 338S100104. You can google CS4272, it has 24-bit 192kHz 114dB output capability, though I wonder if Apple still limits it to 24-bit 48kHz.