Yes a DAC ought to be a big improvement. Audio out on Apple products have long been a weakness.
But a big factor in how much improvement you get will be how well the DAC handles jitter. After the initial model (which measured well) Airports have become notorious for their high jitter. So a DAC that handles jitter well ought to really help things out.
But a big factor in how much improvement you get will be how well the DAC handles jitter. After the initial model (which measured well) Airports have become notorious for their high jitter. So a DAC that handles jitter well ought to really help things out.