4.What's the difference between the E12A and the E12?

A: The E12A is our headphone amplifier targeted for IEMs and efficient headphones, with optimized power output range for such earphones (about 1/2 maximum power of E12), use of top-flight opamps, with quality features such as improved S/N ratio and lowered crosstalk.  Titanium colored chassis is employed for the first time.