I would let it break - in more.
While I don't own a 555, I do own a 333, and it errs exactly on the opposite side of bright. It is full bodied, rich, and features strong bass, but not harsh highs. Its weaknesses are that in resolution, clarity, detail, and most of all, speed.
And, as yours is mulitchannel, are you sure the player is set up correctly? I have seen many a multichannel player(especially, Marantz) sound pretty bad when playing through the incorrect(and default) mode.
While I don't own a 555, I do own a 333, and it errs exactly on the opposite side of bright. It is full bodied, rich, and features strong bass, but not harsh highs. Its weaknesses are that in resolution, clarity, detail, and most of all, speed.
And, as yours is mulitchannel, are you sure the player is set up correctly? I have seen many a multichannel player(especially, Marantz) sound pretty bad when playing through the incorrect(and default) mode.