For a digital-only device, apart from differences in DSP (up-sampling, resolution enhancement, etc.), it's the engineering implementation which ultimately affects jitter. Look at it this way: you might have the best possible clock on your circuit board, but if the circuit board *itself* is polluting the clock signals...

For a device with analogue outputs, all of the above applies, but also the quality of components and implementation of the DAC. For example, Meridian tend to favour multi-bit delta-sigma DACs, which means cleaning up the associated ultrasonic noise and doing so with minimal damage to the phase of the actual music signal.


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