Archimago - you are probably noticing only the jitter characteristics of the SPDIF transceiver chip in the X1 - WM8805 (atleast when using the coaxial input). It is also possible that the USB output also passed through this before the DAC chip. That will explain the lack of any effect from the load on the computer. Follow leeperry on head-fi he know how to find out the source jitter by connecting it to DACs without any buffer/de-jittering chips. BTW, the WM8805 is a wonder which otherwise (10 years ago or so) needed a discrete implementation in the Genesis Digital Lens. Now these transceiver chips (WM8804/5, CS8414/6 are showing up in cheap ebay DACs/converters and helping make jitter as a non-issue even in affordable electronics. Note, though such quality chips were not available in the past and it is better to upgrade to new electronics even at low-mid price levels.
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