Computer Audio Asylum

Music servers and other computer based digital audio technologies.

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it was deliberate

Posted by Joe Murphy Jr on August 17, 2012 at 11:06:50:
Apple was concerned that there were USB devices that would draw a good bit of power from the iPad. They didn't want the battery life to become an issue and thus face the bad PR after touting the battery's long life, so some time back they made a change to iOS (I believe it was iOS 4) that basically dropped the current draw support to 100 mA from the earlier higher amount.

I do know that if you use the camera connector and a Turtle Beach Audio Advantage Micro II, you can feed a DAC via an optical cable. Not High End by any means, but it does work and there are people who use these and similar to feed the optical input of the DAC in their vehicle (lots of YouTube videos online).