Skiroe, the 1.5m recommendation is a minimum length to avoid possible jitter that the cable itself can add to the signal if it is shorter than 1.5m, there have been many posts and white papers written on this subject, if you do some searches in the audiogon forums you will find plenty of opinions regarding this. I use a 3m Kimber USB cable that is a blend of copper and silver, and the coax that I have is a 1.5m wireworld, also a blend of silver/copper. Total for both was less than $160. Have not compared the sound to cables shorter than 1.5m, so I guess I cannot definitively say that the 1.5m minimum is valid, I am just trusting the opinions of engineers and DAC designers.