Gustard R26

@westcoastaudiophile - Glad you're enjoying the Esoteric XD series. One point of correction though is that they are not using an R2R DAC design, according to their website the proprietary XD DACs are a discrete design using ESOTERIC’s exclusive Delta-Sigma (ΔΣ) modulator. You may have confused the fact that they're a discrete design with them being R2R. Just a technicality though, what really matters is their performance which by all reports is exceptional.

@bill_k noted, thanks for details! 

@bill_k found more info about esoteric xd series dac - yummy! 

“[Capable of] 64-bit resolution and overwhelming performance. However, the true essence of this DAC cannot be discussed merely in terms of its specifications. The fundamental goal in the development of the Master Sound Discrete DAC was to achieve an accurate, full-bodied reproduction of all the vibrancy and energy of music. Music is infused with all the passion that a performer brings to a passage, with instantaneous and explosive energy. We wondered if it was possible to use higher-grade parts than integrated chips, as well as more luxurious materials, to create a more powerful DAC that could deliver a superlative analog signal. This idea led us to the discrete DAC. Esoteric’s top engineering team painstakingly invested their very pride into realizing this complete, full-bodied sound.

Featuring four DAC circuits per channel, their eight circuit elements are arranged in a semi-circle for equidistant signal transmission within each DAC. This total of 32 circuit elements are arranged in two circles that present a luxurious structure with all constituent components, including resistors, logic ICs, and power supplies, separated for all 32 of the circuits. Since each of these 32 circuits utilizes an independent power supply circuit, the music’s full burst of energy can be output in its purest form. Furthermore, by selecting the same sort of ultra-high precision resistors used in measuring instruments, the DAC can perform high-speed digital arithmetic processing with greater accuracy.

With a discrete DAC, where component tolerances are directly linked to arithmetic precision, highly advanced quality control is also required for the manufacture of electronic circuit boards. Esoteric’s own in-house factory boasts some of the world’s leading board mounting technologies, such as soldering performed in an oxygen-free furnace, which is located in a clean room featuring the same level of cleanliness found in a hospital operating room. Technologies cultivated in the production of electronic circuit boards for audio, medical, aerospace, and defense industries support the high production quality of the Master Sound Discrete DAC.”

@westcoastaudiophile - Haven't had the opportunity to audition the K-01XD (CD/SACD/DAC version) or N-01XD (Network DAC) yet myself, but have heard from several sources I trust as well as reviews that they're exceptional. Word is that the new XD DAC designs were a huge step forward from the previous X versions which used top of the line but off the shelf DAC chips from AKM. I have heard the Teac UD-701N which uses the basic design of the XD DAC but in a much simpler and more cost effective implementation and I wasn't really impressed. The Esoteric versions are designed on an entirely different level but of course their pricing is commensurate with their higher performance.

@sgreg1 have 200+ hours on mine now and it is the best DAC I have had in my system so far by some margin. FYI my digital front end is as follows:

Linksys router powered by a LHY 25 LPS -> Audioquest Vodka ethernet cable -> Melco S100 switch powered by a Ferrum Hypsos LPS -> fiber optic cable -> Lumin P1 -> Audioquest Coffee USB -> Singxer SU-6 DDC -> Audioquest Vodka HDMI I2S -> R26 -> Audioquest Water XLRs -> amplifier

I ordered a master clock from LHY (the OCK-2) they just released and I assume there will be another sonic boost from this addition to the chain since every upgrade and tweak so far has made a sonic difference. IME this DAC will scale as you upgrade what comes before it - AND I suspect what comes after. Unequivocally the best $ I've spent in this crazy hobby so far.