I'm only repeating what I have read here, but the 2134 used in the Music Hall and the 2604 used in the Onix are very good OPA's. The 627 is more highly regarded but is quite a bit more expensive. As far as I am aware the 627 is used only on the more expensive players like the $5,000 Shanling SCD-T300. None of these really are expensive parts, but the $5 price of the 627, combined with the fact that you need four of them versus only two of the others, would be considered high by a manufacturer. We are able to buy a player for $300-$600 only because the most expensive parts in it seldom cost them more than a few cents wholesale.
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