Great review. I currently have the hd555 and I am looking to get either these or the AD700 soon depending on the price. The ad900 are about $100 more than the AD700 so I would like to know how much of a difference there is if possible. I would also like to knoe if you ever heard the hd555? If you have, how does the soundstage compare to the ad900? The hd555 has too small of a soundstage in my opinion.
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