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Cable effects same regardless of USB mode

The USB receiver still works the same way to sync up to the USB datastream, and still has its own fixed and PLL derived clocks running in the DAC, so still most likely propagates the same jitter signature as with a normal adapative isochronous connection. It's just that with the asynch iso mode you can use a local (high quality) clock for control of the USB receiver codec outputs to the DAC chip (clock, data and enable). Jitter will still be on the signals, but can be much reduced with good layout and isolation techniques. In a perfect setup, the cable shouldn't matter, but hard to achieve that in the real world with all of the many clocks and data processing in a USB receiver, along with noisy power lines from the computer, and the resulting jitter noise added to all of the signals. It takes more than a clock to convert digital data to analog, so timing irregularities on any of the signals will be translated to jitter on the clock since they all share the same current return, and there will always be a voltage-inducing impedance in that return.

So the effects of the cable are the same, but there is the opportunity to reduce how much gets to the analog output with async iso mode.

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