Just saw this. I like the BDA-1 very much. I'm not sure whether I love it. As I've said before, I find it difficult to review gear, but here are my impressions.
By way of background, the DACs with which I am very familiar are the Esoteric D-70, Electrocompaniet ECD-1, Dodson DA-217 mkII D, HeadRoom UDAC, HeadRoom MicroDAC, HeadAmp Pico DAC, North Star m192 mk2, Parasound D/AC 1000, and Benchmark DAC1. Most have been used with some combo of decent to high end stats and dynamic amps and cans. Balanced and unbalanced. For purposes of some of my head-to-head impressions, I use a Manley SkipJack. I listen to lossless and lossy from my iMac through the optical out to the DAC.
I am cable agnostic and don't believe much in burn-in, so I won't dwell on those subjects here. Suffice it to say, though, that much of my gear is used, so burn-in, if any, should not be an issue. Regardless, I do not consider cables or burn-in germane to this post.
Of the DACs listed above, the ones that I have found most appealing have been the ones that have what I would call sweet, or perhaps even emphasized, mids. Such DACs include the ECD-1 and the Dodson. The DACs I have liked least have been those that are splashy and bright such as the DAC1 or a bit subdued, like the UDAC. The North Star and the Bryston stand out for their cohesive presentation and detail, while remaining laid back. (Note: I know some think the North Star is bright; I don't agree.)
The BDA-1 does not have the mids and mid-bass of the ECD-1 or the Dodson. At first blush and especially when A/Bing, this feels like a real deficiency. However, upon further listening, I felt that the fun mids of the ECD-1 came at the price of some congestion (almost a nasal, shouty quality). The Dodson does this a bit, too. In comparison, the BDA-1 presents a very cohesive but wide soundstage. While the mids seem a bit recessed in comparison to the ECD-1, this is a relative not absolute statement. The BDA-1 seems to get it "right" over long periods of listening. Passages where I used to experience fatigue do not result in it nearly as much. Yet, I do not feel that I am missing details. The background is completely black, so music sounds precise; instruments seem agile; and voices are clear without leaping out from the performance.
What emerges then is a listening experience that feels very natural over time. The more I listen to it during a session, the more I like it. If I want to rock out and listen to a few songs with lots of slam, the Bryston is not the source I would go to first. That would be something like the Dodson, which has some of that added midbass slam that can be very satisfying. But I am finding that a sweetened or emphasized midrange can have a price: fatigue. Not the type of fatigue I would associate with the DAC1, but a certain annoyance or ringing to the instruments and voices. This situation simply does not occur when I listen to the BDA-1. It plays it straight, consistent, and without the glare or shimmer that I associate with many other DACs.
At first listen, one might be tempted to call the BDA-1 boring. But I recommend a long listening session with it before reaching any conclusions. I find that I lose myself more easily when listening to the BDA-1, which I think is a good thing. By not emphasizing any particular spots, the BDA-1 achieves a level of smoothness that is growing on me.
That said, I can easily understand someone preferring the ECD-1 or Dodson or even the D/AC 1000. If your listening sessions tend to be shorter and more intense, with lots of rock, then those DACs may be better choices. However, if you will be listening to lots of different genres over a medium to long session, then I think the BDA-1 begins to outshine the aforementioned. It remains smooth and balanced even at high volumes.
The BDA-1 has inputs galore. I have not used the USB input. The BDA-1 can take hi res and while it sounds good to me, I don't have enough hi res to really form a solid opinion. The defeatable upsampling is a nice feature, and I find that it very occasionally sounds better when upsampling is turned off. The thing is built like a tank and looks good, too. Bryston's customer support seems to be very good, and they have a guy who is very responsive to inquiries, which is pretty cool. HeadRoom still takes the customer service award, IMO, but Bryston seems to be doing a fine job, too.
Bottom line. I can recommend the BDA-1. It presents a cohesive and refined sound without sacrificing detail. While it may not rock as hard as some of the DACs discussed above, it can rock longer. It seems that Bryston made some choices with this DAC. In many cases those choices seem to be to err on the side of do no harm. I think that was wise. The music flows well out of this machine. Regardless, I am having a difficult time deciding whether to keep it or the Dodson. I like both enough to not want to part with either. Perhaps that's the best endorsement I can give.
Finally, and somewhat tangential to these impressions, I read a pretty decent post here recently noting that many of the differences between DACs can be attributed to differences in volume based on a given DAC's output. Some are hotter than others, even when the specs say otherwise. I find this point interesting and valid. I tried to volume match, but it isn't easy (I don't have an SPL meter). Just as I am skeptical of burn-in and cable stuff, I am also willing to acknowledge points such as the volume differential, so take that for whatever it's worth.
