Got the 3 ft Auvio cable today, and have been listening for about 2 hours. The barrels are 0.23" (approx. 6 mm) diameter. The socket on the Mikros is about 0.28" (a hair over 7 mm). The cable is not very flexible and the 3 ft length is just long enough for me to stow my iPod in the pocket of my hooded sweatshirt while listening...too short to reach pants pocket (I am 6'4"). The cable appears to be well made, and pretty sturdy. It is not very flexible, but this may change with continued use. I am not certain how much improvement, or difference, there is in the SQ compared to the stock cable...too soon to tell, but clearly there is no degradation to the SQ...the sweet Mikros sound transcends cable choice. This was purchased at Radio Shack for $14.99. I ordered the $2.99 cable from their web site (free ship to boot)...6' and not really practical for a portable set up.
Took my Mikros to RS today, and eyeballed the Pipeline ET4. The clerk took one out of the box and as expected it doesn't fit the Mikros OTB as others ave indicated. Didn't get it, but like the longer 4 ft length though. May need to have another look at it. What is with the arrows? A directional electrical conductor...who comes up with this marketing nonsense. Next thing you know we will have peeps saying that the SQ is degraded if you put it in backwards.
The Auvio must be solid core because it kinks and bends so readily and is pretty unwieldy--not the ideal for portable use.