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Thread: SW1X DAC I Standard Passive I/V version

  1. #1
    Join Date: Apr 2016

    Location: Essex

    Posts: 127
    I'm Slawa.

    Default SW1X DAC I Standard Passive I/V version

    The SW1X DAC I Standard version is now available with two different I/V conversion techniques: Active or Passive. While the active current to voltage (I/V) conversion via a single specially selected transistor matches the impedance better between DAC current out and the valve grid, passive conversion via a resistor provides an alternative solution with a different sound signature.

    Difference in sound between Passive and Active I/V (current to voltage) conversion

    There are distinct difference in sound between those conversion techniques, implemented in Active and Passive versions of SW1X DAC I. While the sound of active I/V over a specially selected transistor has a better “dynamic bite”, the passive resistor I/V method gives a more relaxed feeling to the sound. On the one hand, Active I/V of DAC I has an edge over Passive I/V in resolving details, on the other, passive I/V provides a more organic envelope to the texture of music. Both conversion techniques have merits with a particular music in mind: Active I/V version will particularly excel with energized Rock or Electronic type of music while Passive I/V will sound more harmonically with Jazzy or Classical type of music.

    http://sw1xad.co.uk/production-update/
    SW1X Audio DesignTM ... Finest Audio Components ... Designed and Handcrafted in England
    www.SW1XAD.co.uk

  2. #2
    Join Date: May 2015

    Location: Bishops Stortford

    Posts: 67
    I'm Peter.

    Default

    is it as simple as flipping a switch on the DAC to go from Active to Passive ?

    all the best
    Peter
    Vinyl: Pink Triangle PT1 + Graham Slee Accession + AVI sub and DM5 active speakers
    Digital: HP Laptop + S/PDIF + Beresford 7510 MK6 + AKG K-340 Headphones

  3. #3
    Join Date: Apr 2016

    Location: Essex

    Posts: 127
    I'm Slawa.

    Default

    Dear Peter,

    It is not entirely as simple as flipping a switch. However, it is a relatively simple procedure when one knows what to do.
    Going from active I/V version would imply de-soldering parts and replacing resistors. Going from passive to active is much more complicated as the power supply and the choice of transistors is crucial.

    While either version will not disappoint anybody, it is simply a question of preference.

    S
    Last edited by SW1X; 10-04-2017 at 15:52.
    SW1X Audio DesignTM ... Finest Audio Components ... Designed and Handcrafted in England
    www.SW1XAD.co.uk

  4. #4
    Join Date: Apr 2016

    Location: Essex

    Posts: 127
    I'm Slawa.

    Default

    By the way, I noticed that you are located near Bishop Stortford, which is about half an hour by car away from us. You are welcome to audition both versions and decide for yourself which you prefer.

    S
    SW1X Audio DesignTM ... Finest Audio Components ... Designed and Handcrafted in England
    www.SW1XAD.co.uk

  5. #5
    Join Date: Mar 2016

    Location: Barnet, london UK

    Posts: 738
    I'm Adam.

    Default

    As always with SW1X products, Dr Slawa and his team are always pushing the boundaries in Sound Quality possibilities and presentations,
    using the very best and carefully selected components and the simplest approach. Always probing to deliver more from their products.
    A rare thing in todays market.
    "lack of passion is fatal"
    Garrard 401 / SME 3012 J7 Rewired / audio-technica ATP-12T - phonomac modified / Ortofon Vintage SPU GE /Shure M3D /DV XX2Mk2 / The Cartridge Man Music Master with isolator / Vintage GE VRII Mono / WAD 300b Power modded, TJ Mesh Plate Valves / David Coe AD Audio 'Satchmo' Pre & Phono / Hashimoto HM-7 SUT / Tannoy 12" MGs in RFC Custom Rutland Cabinets with RFC Custom Crossovers / Speaker Cables: Duelund DCA16GA Tinned Copper / Rpi3 & Digi + pro / SW1X Audio Design USB-SPdif / SW1X Audio Design DAC 1 Signature / Interconnects: Duelund DCA20GA home brew /SW1X Audio SPDIF AERO 6 / AD Audio Silver USB / Synology NAS Drive / Roon / Tidal HiFi / Mains Power Conditioner

  6. #6
    Join Date: Apr 2016

    Location: Bishops Stortford

    Posts: 575
    I'm Chris.

    Default

    Quote Originally Posted by SW1X View Post
    By the way, I noticed that you are located near Bishop Stortford, which is about half an hour by car away from us. You are welcome to audition both versions and decide for yourself which you prefer.

    S
    Hi

    I too live in Bishops Stortford and I cant offer you a chance to listen to active vs passive I/V but I can offer a chance to listen to the SW1X 'sound', having purchased much of Slawas kit. Also a chance to have a coffee and chat if you wish.

    Cheers Chris

  7. #7
    Join Date: May 2014

    Location: Solihull

    Posts: 360
    I'm Martin.

    Default

    A while ago after a brief conversation with Slawa re tube rolling, he recommended a 6N6P NOS tube made in the 60's at the FOTON factory
    I have obtained a pair (could not find singles) and one of them has sat in my DAC 1 since before Xmas
    It leaves the stock one for dead and is slightly better at detail retrieval than my Tesla, although not quite so good at ambient detail. The treble balance is slightly higher but a worthwhile improvement and at about 30 squids for the pair not too bad a price
    Tangerine LP12,Naim Aro, Benz Wood
    Audiomeca Talisman Highly Modded
    Audiomeca Kreatura & Elixir Dac,SW1X DAC1
    Hovland HP100 MC
    SiriuS D100
    Quad FM4,RWA Cassabria + LCD 3
    HSM with re capped Mundorf Supreme and Atlas rewire
    Cables by Cardas, Hovland G3 and Yter

  8. #8
    Join Date: May 2014

    Location: Solihull

    Posts: 360
    I'm Martin.

    Default

    Quote Originally Posted by ovlov854 View Post
    A while ago after a brief conversation with Slawa re tube rolling, he recommended a 6N6P NOS tube made in the 60's at the FOTON factory
    I have obtained a pair (could not find singles) and one of them has sat in my DAC 1 since before Xmas
    It leaves the stock one for dead and is slightly better at detail retrieval than my Tesla, although not quite so good at ambient detail. The treble balance is slightly higher but a worthwhile improvement and at about 30 squids for the pair not too bad a price
    These are they

    /www.ebay.co.uk/itm/2x-6N6P-ECC99-E182CC-Square-Getter-Foton-1960s-Gold-Grid-Tubes-NOS/191887911796?ssPageName=STRK%3AMEBIDX%3AIT&_trksid =p2060353.m2749.l2649
    Tangerine LP12,Naim Aro, Benz Wood
    Audiomeca Talisman Highly Modded
    Audiomeca Kreatura & Elixir Dac,SW1X DAC1
    Hovland HP100 MC
    SiriuS D100
    Quad FM4,RWA Cassabria + LCD 3
    HSM with re capped Mundorf Supreme and Atlas rewire
    Cables by Cardas, Hovland G3 and Yter

  9. #9
    Join Date: Apr 2016

    Location: Bishops Stortford

    Posts: 575
    I'm Chris.

    Default

    Quote Originally Posted by ovlov854 View Post
    A while ago after a brief conversation with Slawa re tube rolling, he recommended a 6N6P NOS tube made in the 60's at the FOTON factory
    I have obtained a pair (could not find singles) and one of them has sat in my DAC 1 since before Xmas
    It leaves the stock one for dead and is slightly better at detail retrieval than my Tesla, although not quite so good at ambient detail. The treble balance is slightly higher but a worthwhile improvement and at about 30 squids for the pair not too bad a price
    Yep many Russian valves are great. Older the better
    SW1X Universal Music Server UMS I Signature with Power Supply Unit PSU I Signature
    SW1X USB I Signature
    SW1X DAC II Special
    Passive Volume Control
    Ron Welbourne DRD 45 monoblocks improved by SW1X
    SW1X Open Baffle Speakers containing vintage alnico drivers - Grundig tweeters, Saba Greencone midrange and Altec VOTT 416 bass.
    Silver mains cables, interconnects and speaker cables by SW1X

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