But I'm getting way ahead of myself. The actual order in which we listened was as such:
1. Klimax DS/1
2. Klimax DS/0
3. PS Audio PWD
And then back and forth countless times, over the coarse of 6 hours.
Naturally I leveled the playing field in terms of interconnects and powercables by using powercables that come from a single schuko connector so that they not only are the same cable, but also have the same position in the extensionblock. Both DSses were setup on the same feet in the Spider rack and the Cardas Hexlink Golden 5C XLR interconnect was swapped from DS to DS. What's more: the involvement factor goes up the higher you go in a Spider rack, and the DS/1 was in the bottom position, which puts it at a slight disadvantage. But as it would turn out: this was no limiting factor whatsoever.
When switching from DS/1 to DS/0, the DS/1's owner and me looked at each other and it was clear that we were in agreement: the DS/0 just doesn't keep up. Yes, its detailing and overall character is almost unchanged, but the DS/0 just doesn't grab you. It sounds flat in comparison. The DS/1 is everything the DS/0 is, but better. It is every bit as smooth, creamy and fluid, perhaps even more finely resolved, but it is much more dynamic. It swings from super-soft to loudly-dynamic with amazing ease. Also its soundstaging is a lot better: instead of the DS/0's smallish bubble, there is now a larger bubble with better focus. Instruments are more reach-out-and-grab, they stick out from the bubble more. Also piano attack and body is more real, more like what the PWD does, which makes the DS/1 much more acoustically credible. In a way, the DS/1 reminds me a lot of how my Levinson 390S sounds in terms of soundstaging and overall involvement.
Then for the final tests, I re-installed the Levinson 390S in its usual position (it had been kept powered on all the time), to see if the Klimax DS/1 would now be on equal ground. The Klimax DS/0 already challenged the CD player in some areas and even beat it in others, but overall I preferred the Levinson's better timing and more royal character. Well, again using the same Cardas Hexlink Golden 5C interlink, switching between the tow, the DS/1 could now really be considered to be in the same league. There were differences but in absolute terms they were small. What's more: Chet consistently felt that the DS was better. How about that! Myself, I felt that while the DS/1 had better treble and more nimble bass, as well as better resolution, the Levinson was still more generous, more enveloping and bigger. Chet described it as being "more veiled, more friendly" and indeed his observation is spot on. This was why I prefered the Levinson, and why he prefered the Linn. Same ears, different opinion. What's clear to both of us though, is that both players are very nice and that it doesn't take much time to get used to either one. But we couldn't listen to the DS/0 very long before getting annoyed. And this is something to really think about.
CONCLUSION
The upgrade may be very expensive, but well-worth doing. It brings the whole delivery to another level. While the Klimax DS/0 was already regarded as the world's best streamer, the DS/1 makes sure that Linn maintains that position. While I'm writing this I can imagine that some people may think that when the best has now been improved, surely "the best" wasn't very good to begin with. I can understand that stance but this is not the case. When the DS/0 was introduced, there was simply nothing around that could equal its mix of utter naturalness and extremely finely detailed sound. Computer audio simply never sounded this good. Yet, some CD players had and have more bounce, more involvement, even if they sound less detailed and less well-balanced. This is what the DS/1 adresses: it takes all the DS/0 strong points and adds to them significantly. Importantly, it does this without sounding more analytical, more dry or otherwise more technical. The DS/1 is the reference, and I think that it will keep that position for quite a while. I sold my DS/0. Need I say more?