Sonic difference 1.0m vs 1.5m digital cable

Would take some mighty golden ears, IMO. I've never heard a difference of a half meter of IC or speakerwire. I suppose if it were not well shielded that the longer length would make it a bit more prone to picking up hum from other components and power lines.

I forgot to mention that the difference might be audible to a select few if you are using a passive preamp. Even then I have serious doubts.