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SW1X Audio Design™ DAC III VSB

Performance Level 3
Digital to Analogue Converter

The VSB version is essentially a DAC III STD/SPX with an integrated Valve USB interface in full size chassis like the Balanced version just without signal OPTs, larger power supplies & power tube output stage.

For higher perfomance, there are Balanced versions of the DAC III is equipped with signal output transformers (OTPs) providing true balanced and single ended ouputs however wtithout the Valve USB interface.

For maximum synergy, musical & analogue character, all STD/SPX & Balanced versions were designed to be paired with our VDT Digital Source products.

DAC III is currently available in following versions:

SW1X Audio Design™ DAC III VSB Features:

  • Pure NOS (Non oversampling – zero digital domain filtering) Design
  • Selected and Harmonically Matched Component & Material Quality
  • Anode Follower, Zero Negative Feedback, Single Ended, Class A, RC (resistive loaded, capacitive de-coupled) Valve Amplification Topology
  • 6N6P Double Triode Valve Output Stage
  • 6X5 Indirectly Heated or Directly Heated 5Y3 (SPX version) Valve rectified CLC (choke filtered) Power Supply
  • Dynamic Element Matching (DEM) of the TDA1541 is powered by an asynchronous E180F Valve Clock with EAA91 Valve rectified Power Supply
  • Active I/V conversion via a single specially selected transistor (with less than 10 Ohm input impedance) with the shortest signal path directly connected to the tube grid
  • Circuit is wired with of a specially selected copper (single strand or Litz)
  • Discrete Transistor Shunt Voltage Regulated Power Supplies for the TDA1541, SPDIF receiver and active I/V conversion
  • 3 (4 x on VSB version) x EI core Mains Transformers & 2 x Chokes

Specially Selected and Harmonically Matched Component & Material Quality

  • M6 grain orient EI core Mains Transformers & Chokes (SPX version)
  • Black Gate de-coupling Capacitors for TDA1541 DAC (SPX version)
  • AN Copper Foil Signal Output de-coupling Capacitors
  • Internally wired exclusively with our SW1X Magnum, Genesis and Opus conductors of various geometry (single strand or Litz)
  • AB 2W non-magnetic Carbon film Resistors (SPX version)


SW1X Audio Design™ VSB Valve USB Interface Features:

  • Discrete and Independently Transformer powered Master Clock – the Heart of Digital
  • Valve Output Stage for the SPDIF signal Output
  • Discrete & independent Linear Power Supplies for CPU, Master Clock & Output Stages

Audio Playback

  • Coaxial SPDIF Audio Output, PCM up to 192 kHz 24/32 bit
  • AES/EBU Audio Output, PCM up to 192 kHz 24/32 bit
  • USB Audio Output, PCM up to 768 kHz 32 bit

Tube Compliment: 1 x 5Y3 SPX, 1 x 6N6P, 1 x E180F, 1 x EAA91 and EC86 for SPDIF Output



Note: Due to SW1X Audio Design’s ongoing research and development process, specifications are subject to change without notice.

dac iii



Dimensions VSB version: Height (mm) 150 x Width (mm) 340 x Depth (mm) 400

Weight (kg) STD version: 15

Max Power Consumption (W): 45

Output Noise, Unweighted (mVrms): < 0.5

Output Impedance (kOhms): <1


DACs made by SW1X: The speciality of making great sounding designs



We do not recommend purchasing a key system component without first auditioning it carefully, which is why we have demonstration rooms and a 14 day trial period 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.


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