Here's another data point to add.
stock Samsung Galaxy S3 > digital USB audio out >> USB OTG cable >> Audioengine D1 >> AKG K702.65.
Thanks!
Quote:
A word of warning though, I only tested it for 1 song because when I was checking one of my battery monitor widgets, it was showing 1,000mA power draw from the battery. Granted, the widget may not be super accurate, but nonetheless, that is a lot of current to draw from the battery. I would recommended using one of those USB OTG Y-Power cables with an external power supply if you want to use for anything more than testing. Mine is on its way from dx.com so it'll be another 2-3 weeks before it arrives.
Another way: Qi wireless charging with a portable wireless charger like the Mugenizer N11 Portable Wireless Charger Power Bank with 4800mAh
http://mugen.hk/mugenizer-n11-portable-wireless-charger.html
Qi wireless charging standard:
charging base station >> power >> mobile device
http://blog.3g4g.co.uk/2010/09/wireless-power-consortium-wpc-launches.html
http://en.wikipedia.org/wiki/Qi_(wireless_power_standard)
Some Android devices like Google Nexus 4 or Google Nexus 7 2
nd gen have built-in Qi receiver.
Others, like Samsung’s flagship smartphones, have Qi receiver included in an aftermarket battery door.
"Automotive Industry selects Qi
The CE4A is a initiative of the automotive industry that aims to standardize interface between vehicles and consumer electronics products, such as smartphones.
CE4A generated requirements that must be fulfilled for use in automobiles. These relate to installation space, usage profiles, electromagnetic compatibility, and safety, for example. In addition, the standard must be ready for future requirements and offer potential for further development and commercialization as well as have global distribution and the acceptance of handset makers and wireless providers.
Based on these considerations, CE4A recommended its members to use the Qi standard in current and future vehicle models."
http://www.wirelesspowerconsortium.com/blog/73/automotive-industry-selects-qi
"Mercedes-Benz introduces Qi wireless charging
Following the announcement of the CE4A on September 3, Mercedes-Benz announced on September 6 that they will act on the CE4A's recommendation and introduce Qi wireless charging in their consumer vehicles."
http://www.wirelesspowerconsortium.com/blog/74/mercedes-benz-introduces-qi-wireless-charging