SW1X DAC I Special X

SW1X Audio Design™ DAC I Special Performance Level 1 D to A Converter with USB I interface and valve rectified power supplies


SW1X DAC I Special is the maxxed out circuit of DAC I and USB I in one chassis with addition of fully choke filtered and indirectly heated valve rectified power supplies.

DAC I Special X has 2 inputs: USB and SPDIF but could also be configured (on request) as I2S directly connected to TDA1543 via USB input only.

This is a high end entry level solution to a musical, organic & analogue sounding digital setup- just add an analogue sounding digital transport and re-experience your collection of music.



SW1X Audio Design™ DAC I Special Features:


USB I interface section

  • Master clock is based on low noise EC88 triode tube powered by a separate transformer and is output transformer de-coupled from the rest of the circuit
  • Power supply of valve master clock is valve rectified
  • Custom Shunt regulated power supply based on a Germanium transistor for the USB/SPDIF receiver/transmitter
  • separate power transformers: one for the master clock and one for the USB receiver / tube S/PDIF digital signal output stage
  • CLC (choke filtered) valve clock and valve SPDIF output stage power supply
  • E180F tube buffered S/PDIF output stage
  • Plug’n’Play with USB OTG- no drivers required for Mac, Windows, Linux and Android operating systems (works with Samsung Galaxy and Android TV box, iPad 3)
  • Asynchronous USB data transfer mode (sounds best with a dedicated, unpowered USB interconnect such as SW1X AERO 5 USB)
  • Bit perfect data transfer with Kernel streaming, ASIO and WASAPI support
  • Resolution 16/24 bit, 32KHz, 44.1KHz, 48KHz, 88.2KHz, 96KHz (higher resolution than 24 bit is not supported by S/PDIF anyway)


for Frequently Asked Questions (FAQ) click here


Reviews and customer’s feedback can be found here


I/U Conversion Transistor Options


20170724_155630 20170724_155617 20170724_15553820161015_135904




Dimensions: Height (mm) 130 x Width (mm) 335x Depth (mm) 400

Weight (kg): 12.3

Max Power Consumption (W): 15

Output Noise, Unweighted (mVrms): < 0.5

Output Impedance (k Ohms): <1

Tube Compliment:  6N6P, EAA91, EC88, 2x 6X5GT


SW1X Audio Design™ DAC I Special is available on custom built to order basis only


SW1X Audio Design Product Price List



We do not recommend purchasing a key system component without first auditioning it carefully, which is why we have demonstration rooms and a flexible home loan policy.

However in certain situations it can be difficult for people to get to our showroom and for those instances we can offer our mail order service.

For demonstration and ordering click here

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