Hi all,   Currently I use the Fiio E7 with my iPod classic to power the UM3X and I'm looking to upgrade.  My budget is around $200-$300.  Right now I'm eyeing the JDSLabs c421 with the AD8620 opamp and the Headstage Arrow 4G - I know the Arrow costs almost twice as much as the c421, but from...

Hi all,  I recently purchased a 16GB Cowon C2. Right after the purchase, I plugged in a microSD card loaded with some music and it played well, no issues.   When I got home, I loaded some music onto the internal storage from my Macbook Pro.  Before I ejected it and tried it out, I also...