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SW1X Audio Design™ DAC II SPX Performance Level 2 D to A Converter
DAC II is based on 2 x PCM56 DACs with more sophisticated power supplies and powerful 6N6P/6N30P/5687/E182CC valve output stage with 6X5GT (or GZ34/5Y3/5R4 as an option) valve rectification. The DAC has a similar analogue & musical character akin to DAC I but with a step up in low level musical refinement and presentation on another level. The more dynamic sounding active I/V (current- to voltage conversion) stage is directly connected to the single ended class A, zero feedback, anode follower 6N6P/5687 tube output stage. The whole circuit has only one decoupling capacitor per channel in the signal path. Everything, including the whole signal path is wired with specially selected copper conductors & dielectric from input to output. The DAC II is also available in the SPX, Balanced or Signature version, which is limited in supply due to scarcity of the exotic materials & components.
All SW1X products are graded according to the SW1X Audio Design™ Performance Level System. Within the performance level system, most products are offered in 3 similar but at the same time distinct versions: Standard, SPX and Signature. The rationale behind is that there is a further room for musical performance, which can be graded within each performance level. So, a version represents a grade within a performance level. Any given version reflects quality, availability and degree of harmonic matching of Components & Materials (within given performance level) a product is made of. Standard or STD is the basic version, Special is the specially selected & customised and the Signature is the most refined version.
For example, DAC II is a performance level 2 product i.e. has more sophisticated power supply & circuit design relative to DAC I. While the Standard version of DAC II comes with mostly available, excellent quality and easier to integrate Components & Materials, The SPX version is usually graded somewhere in between Standard and Signature: it is based on a circuit design of the Standard version (with improved power supply), has specially selected materials similar to Signature versions but does not utilise the most exotic materials & components that are only available in limited quantities such as Black Gate capacitors (reserved for Signature version). On top of that the SPX version entails sonic customisation options such as choice of I/U stage materials and output capacitor choice.
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