Esoteric K-01

The Esoteric site has a fairly detailed descriptive PDF for the K-01. See:
http://esoteric.teac.com/resources/pdf/k-01.pdf

It looks like K-01 uses 32-bit AKM DACs--8 per side. K-01 uses neither Burr Brown nor Analog Devices, making it potentially sounding different from X-01 D2 and P-03/D03. . This early in the game I would not venture to guess whether the K-01 exceeds the performance of the P-03/D-03 combo, or even of the X-01 D2. It is unlikely that any of the K-01 in the US right now are fully broken in. It may be a spell before we can get some detailed findings on this device.

G.

FWIW - I have the 2nd generation 32-bit AKM DACs in my APL - NWO-ME Super-DAC prototype that I use along with my upgraded Esoteric UX-1, which I believe has the Burr-Browns in it. While I realize there are way more DACs in the APL prototype, so that any comparison is 4 apples to 20, I can't help but be impressed by the AKM DACs. Pretty much more of everything and the ability to get much further into the music - like a veil or 2 are lifted.
It will be very interesting to see how the K-01 sounds, especially after break-in. The only concern I would have is accuracy vs. musicality - not sure how Esoteric will handle that. The APL uses a double tube output stage, but I didn't see any tubes in the Esoteric.

>>11-27-10: Sounds_real_audio
AudioFeil
Not sure I can live up to your high standards<<

Well I'm sure.

You can't.

APL NWO Master uses AKM 4399 DACs. K-01 also employs the AK4399. There are no tubes in K-01.... The Esoteric PDF file states: "A discrete buffer output circuit with a high voltage power supply of
+/- 22 V has been deployed for the analog audio output, following
the technology used in the D-01. [...] These powerful discrete buffer output
circuits are laid out symmetrically for each of the hot/cold signal
lines to construct a rich and fully balanced configuration for XLR
audio outputs. Additionally, a parallel buffer output configuration is
implemented to switch the buffer amplifier to a parallel
configuration, when RCA audio outputs are used."

As for K-01 being more/less precise/musical than APL NWO, I doubt that anyone has any hard evidence one way or another this early in the game.

Hello Guido,

The NWO-M has the AK4399 DACs working in an unusual configuration resulting in different level of performance.

The balanced transformer-coupled tube output stage has the following features:

1. Fully differential configuration
2. One triode per phase (hot/cold) on the signal path
3. No negative feedback
4. No solid state components on the signal path
5. Custom made Oxygen Free Copper output transformers by Lundahl, Sweden
6. Vintage E182CC tubes made in Holland
7. Because of the output transformer coupling, the user can enjoy exactly the same audio quality from XLR or RCA output depending on the preferred output configuration without any additional components on the signal path.
8. Filter-less design for linear phase in the hearing range.

Hope all is well!

Alex Peychev
www.aplhifi.com