Hi Fado,
Some people might argue that the power wart that the powered usb hub uses will introduce noise. As a software engineer i believe (its of my opinion as a software engineer) that is untrue. However though that I have heard of people stating they can hear the difference and i'm not about to call them a liar by any means. With that said a good quality powered usb hub costs about 20 to 30 dollars, so it might just be easiest to pick on up and find out for your self. We have already tested the BDP-1 with the DLink DUB-H4 powered hub, it was able to power to 2.5" hard drives, one of these drives consumed a full amp. Hope this info helps.
Cheers,
Chris