They are basically the same internally, just different casing for the M55.
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I just received a T585 and opened it up. The audio pc board and the video pc board both have M55 printed on them. The power supply doesn't so I am not sure. I have not listened to it yet so no comment on sound quality. I purchased it only for audio. I hoping this is the $1800.00 wolf in as low as $600.00 sheep's clothing.