Made a few more tests. The cable upgrade also reveals the very bad sound output of my Dell D620 (Intel HDA Sigmatel). Track 5 (Let Down) of Radiohead's OK Computer has distortion throughout.
Playing the track on my desktop PC with a Creative PCI128 CT4700 (an Ensoniq 1370 inside) produces no distortion although the card has a wavy hiss at ~0dB gain. Probably because of the power supply.
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