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MDAC First Listen (part 00110010)

Discussion in 'audio' started by 44000khz, Aug 15, 2016.

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  1. Superior

    Superior pfm Member

    Oh that´s easy, maybe going to the next parcel shop! :D

    Ok, just joking.

    Get some break from all the hard work and travelling.
  2. JohnW

    JohnW pfm member

    Its horrid weather here in CZ, the Long hard Winter is setting in - our dearest little Pups poke there noses out the door and then look at me in pure terror! Pups.JPG

    It was 27 DegC in the evening in Hong Kong last soon as Renata completes her studies we are out of here!
  3. Sibbers

    Sibbers pfm Member

    My old dog would desperately need a wee in the morning and would bark at the door until someone came down in the morning to let her out, but if it was bad weather (cold rain or snow) she would just look at me as though I was an idiot and would rather hold it in as long as she could manage than go out. Ha. Some dogs have real character!

    Congrats on the delivery of the #1 superior unit. Great to post to see. Those measurements are impressive. Can you hear the benefits of such low THD..?
  4. jirij

    jirij Virtual Member

    Come on, it's not that bad. :) At least no more super hot days!
  5. JohnW

    JohnW pfm member

    Well I really feel the cold - I prefer the heat, although not when its above 25Deg in the Lab for too long... I just miss Hong Kong, so in some ways looking forward to our designs reaching production so I can spend more time in Asia - but then on the other hand, I don't want to leave Renata or the Pups!!!
  6. busb

    busb Mine's a pint of beer please

    Now that is a class picture!
  7. iansr

    iansr pfm Member

    Hi John
    I need to decide what to do about my Fusion. I've been advertising it for sale, but no luck so far. The bulging caps are a further complicating factor. My options would seem to be:
    1. Keep it as a Fusion and ask you to replace the caps, or
    2. Use it as a donor for a MDAC2

    Option 2 doesn't seem to make sense, but 1 doesn't help me really because I need 2 identical DACs for my active system.

    Have you any thoughts or see any other options? Skype message me if you'd prefer to go off line.
  8. JohnW

    JohnW pfm member


    I'd go for option 1. and add an advanced clock board - this will bring a decent improvement :) shame to waste a Full Fusion on an MDAC2 upgrade....
  9. iansr

    iansr pfm Member

    I know it would be a waste to use it as a MDAC2 donor. But I need 2 similar DACs, one for the left channel and the other for the right channel. Would my Fusion and a MDAC2 have the same gain and the same latency?
  10. sam_cat

    sam_cat C'est Crounchifique!

    Go grid connected with battery backup. Solar+wind generation, pile of batteries and a smart inverter/charge controller. Sized correctly you can keep working whilst everyone else is in the dark.
  11. wintoid

    wintoid pfm Member

    Don't give John another project!! :)
  12. misterdog

    misterdog Not the canine kind

    Could provide a solution for the Mdac PSU problem..
  13. JohanH

    JohanH pfm Member

    I didn't know there was a problem with the MDAC PSU....
  14. misterdog

    misterdog Not the canine kind

    There isn't until you hear one with a 5 rail regulated supply.
  15. fusion5

    fusion5 on the dark side of hifi...

    Well, does it sound good? :)
  16. sam_cat

    sam_cat C'est Crounchifique!

    Very much this... I have the original Soverign+ DC that JohnW modified years ago (around the time of the Soverign mods). It has all Soverign+ mods plus stripping out all AC rectification and splitting the rails so it requires a dedicated 5 rail PSU.. I built a 5 rail psu with lots of tweaks, 5 winding toroid with Electrostatic screen and EMI/RFI Shield, 5 seperate channels of hexfred rectification, CRCRC tailored around the loads and then 5 SuperTeddyRegs. All cable lengths kept as short as is sensible, plus care with the wiring and internal layout to reduce the risk of any crosstalk/noise.

    It sounds sublime, and when you hear a 'standard' Mdac next to it the difference is pretty big.
  17. iansr

    iansr pfm Member

    The rectification/ regulation board in the MDAC does seem to be a weak link and as I recall John has confirmed that the regulation on at least one of the rails is below par.

    With the MDAC2 I'm not clear whether there will a new and upgraded on-board AC-DC board, or whether the required external PS will provide the rectified / regulated 5 rails.
  18. Mark Dirac

    Mark Dirac pfm Member

    Seems to me there are three key weak (or, more accurately, not-strong) links:

    1. Analogue output. I gather that the MDAC2's analogue output will be as good as the FDAC's (within the capabilities for screening in the tiny MDAC casework).
    2 USB input. I gather that the FDAC's USB noise & jitter rejection will not be adequate, and so a Detox is required in addition. I am therefore assuming that the MDAC2 will perform as well as the FDAC in terms of USB noise & jitter rejection (i.e., the MDAC2 will depend upon the Detox no more or less than the FDAC will.)
    3. Supply of power. I am curious to establish if the MDAC2's supply of power (i.e. PSU, rectification, regulation etc) will be as good as the FDAC's. Because this seems to be a critical area (or critical not-strong link, if you prefer).
  19. fusion5

    fusion5 on the dark side of hifi...


  20. iansr

    iansr pfm Member

    Well that does imply a new rectification/ regulation board, but if that is the case why is a new external PS needed? More VA required??
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