I've owned the Audio Research Reference 8 CD player for a couple weeks now. I figured I should at least give a few words on how I think it sounds.
First I dropped it into my Big Rig to get a feel for how it performs. It is highly musical and does nothing offensive. The highs are a touch restrained over my beloved Berkeley Alpha Reference 2 DAC. There's not quite as much air or three-dimensionality as with the Berkeley. The mids are smooth and a bit more pronounced than the Berkeley. The biggest difference is in the bass, where the AR gets a little wooly and not as tightly pitch defined. So, as an absolute, it would not displace my Berkeley DAC. But if the Berkeley is a 10, I'd give the Reference 8 a solid, um, 8.5.
But in my headphone rig, where if a recording is too hot on top, it'll blister your ear drums, the Ref 8 filters out a lot of that, resulting in a more enjoyable performance. I find it just about perfect for headphone listening. Musical and quite accurate.
And a word on tube testing. I test ALL tubes with a Hickok 6000A tester before use. One of the triodes within one tube that came with the AR had a Significant loss in transconductance, about half output of the others. I had a spare 6h30 tube and used it. I don't know how much degradation in sound that one tube would have had. But it couldn't have possibly been positive.
