I know this is a little late but might help others.
I have also had a noisy power adapter and have had it exchanged. The new adapter is almost silent when you power up the console. If you listen hard you can just hear a faint whisper of air from the fan in the brick.
The old brick blew really hard from the moment I switched it on and the noise level from the brick was considerably louder than the console itself. The power adapter should not be louder than the console as mine was.
Not sure if this is relevant but the noisy power brick I owned was a (rev b) purchased in the UK. I've seen it mentioned elsewhere that this type of brick is noisy so perhaps there is a problem.
Hope you got your brick changed.
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