Just wanted to share with you a simple project that is quick and produces guaranteed improvement in SQ. The Mytek products truly do benefit from tossing the IEC cord and to provide DC to the input power female jack. I just purchased a Mytek Liberty actually for my home stereo but overal SQ is of course shared with headphones as a source to a good headphone amp. The jack is a 2.5mm DC male on the Mytek products. The center pin is 12+V and the outer connection is ground like many universal applications of a DC plug. My 10,000 MaH Lithium battery pack has a 2.1mm jack so I purchased some connectors with a toggle switch. Some quick soldering and I have approximately 10hrs of play time . The Lithium battery has a wall wart that trickle charges the battery when the battery is not in use. Removing the IEC plug from the equation has increased my sound stage with much more details. The location of instruments can be found with pin point accuracy. The music flows effortlessly with a new found finesse. I use a Blue circle power conditioner and high quality power cords made by Audio Sensibility using ohno copper. The DAC sounded great as is but using a DC power source the sound is NOT a marginal step up compared to being plugged in. I'm quite fascinated in the drastic change. I'm still considering the Sbooster for more convenience of being plugged into 120VAC. However the fact that there is no conversion of AC to DC the battery pack is probably the cleanest power source introducting no noise. I've seen people using the QC2.0/3.0 usb charger and coupling it with a QC 2.0/3.0 trigger "hack" and using a male usb connector with 2.5mm male DC plug. The issue i have with that is when the trigger is activated it apparently is regulating the voltage with according to an engineer has a switching mechanism. My solution of going straight with the lithium pack is pure DC. The components I was using is: 1) 2.5mm DC power plug male with right angle and straight 2.5mm plug (4 feet). 2) in my case a 2.1 (my equipped plug on battery) I used a "switch inline with 2.1mm barrel jack". 3) Lithium 10,000 mah battery pack with trickle charge wall wart (not to be used when DAC is on). The extension cable with 2 male ends I cut in half. This way I can make another plug (spare cable).