Apparently Samsung messed up on the USB hardware, when a USB device draws above a certain level of current the S3 can self destruct, hence the powered Hub protects the S3.
Wow, surprised to read that, as I thought the Galaxy S range was one of the better handsets for usb audio. At least that was the impression from occasional visits to this thread.
Anyhow, If I bought the S3, I would definitely want to install a custom rom (such as CyanogenMod) to improve the phones everyday performance. Would that change usb audio in any way?