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Thread: MacBook used in a Digital system

  1. #81
    Join Date: Apr 2008

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    I'm Neil.

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    Quote Originally Posted by Macca View Post
    So what's your take on it then, Chris? Personally I've no doubt that 90% of the things people think matter in digital audio make no difference whatsoever. 'Jitter', 'Bit perfect', 'high resolution' and so on. The things that do matter, like the power supply regulation, no-one seems to be interested in.
    If your DAC uses a USB powered connection then this is a great piece of kit:

    http://www.aqvox.de/usb-power_en.html

    Makes the computer side a lot less relevant, as you get independent, galvanically isolated power for the USB device.
    Mana Acoustics Racks / Bright Star IsoNodes Decoupling >> Custom Silent Media Server >> Halide Bridge USB (with AQVOX USB power) >> Pedja Rogic's Audial Model S DAC + Pioneer PL-71 turntable / Vista Audio phono-1 mk II / Denon PCL-5 headshell / Reson Reca >> LFD DLS >> LFD PA2M (SE) >> Royd RR3s.

  2. #82
    Join Date: Nov 2008

    Location: Valley of the Hazels

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    Quote Originally Posted by Macca View Post
    So what's your take on it then, Chris? Personally I've no doubt that 90% of the things people think matter in digital audio make no difference whatsoever. 'Jitter', 'Bit perfect', 'high resolution' and so on. The things that do matter, like the power supply regulation, no-one seems to be interested in.
    My take on it is that power is everything.
    Clean the mains up effectively and you'll get tangible gains in sound quality.

    The main culprit is switching noise from SMPS, and they're all pervasive.
    TVs, DVD/BDPs, central heating, fridges, washing machines - the list goes on and on - they all have SMPS, and they're all chucking switching noise onto the mains.

    Reduce all that switching noise, inaudible though it is, and your audio equipment will sound better.
    Chris



    Common sense isn't anymore!

  3. #83
    Join Date: Aug 2008

    Location: Suffolk, UK

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    I'm Paul.

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    I think that things like mains filters are ferrite beads are somewhat effective at stopping noise from the mains getting into your equipment, but are can be much more effective if you use them to stop noise generated by equipment getting onto the mains. This is why instead of using a large mains filter block I use single filters primarily on anything with a switchmode supply including the wifi router, which is close to the HIFI. Ferrite beads are on the fridge and CH boiler mains cables instead on the HIFI mains leads.
    ~Paul~

  4. #84
    Join Date: Nov 2008

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    Quote Originally Posted by Primalsea View Post
    I think that things like mains filters are ferrite beads are somewhat effective at stopping noise from the mains getting into your equipment, but are can be much more effective if you use them to stop noise generated by equipment getting onto the mains. This is why instead of using a large mains filter block I use single filters primarily on anything with a switchmode supply including the wifi router, which is close to the HIFI. Ferrite beads are on the fridge and CH boiler mains cables instead on the HIFI mains leads.
    That's what I did too.
    Ferrite clamps on everything but the audio system. The audio system doesn't need filtering because all the PSUs are linear, and don't exhibit the high frequency switching noise.
    Last edited by Stratmangler; 11-05-2018 at 09:29.
    Chris



    Common sense isn't anymore!

  5. #85
    Join Date: Oct 2008

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    I'd avoid these tbh.
    Made my servers sound worse and weren't even compatible with certain hard drives.


    Quote Originally Posted by Yomanze View Post
    Actually made the sound worse in my system! I use a fanless PC with solid state drive now, no filters, and my USB output has its own independent power supply, outside of the PC.
    Saw Jaws in ‘75 at the Cinema...
    Star Wars in ‘77
    Close Encounters in ‘77
    Superman in ‘78
    Raiders in ‘81

    ...I’m doing the same thing with my Son (who’s 24)
    Only now getting the wisdom of my Dad and I’m 50 next birthday!

  6. #86
    Join Date: Aug 2009

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    Quote Originally Posted by Stratmangler View Post
    My take on it is that power is everything.
    Clean the mains up effectively and you'll get tangible gains in sound quality.

    The main culprit is switching noise from SMPS, and they're all pervasive.
    TVs, DVD/BDPs, central heating, fridges, washing machines - the list goes on and on - they all have SMPS, and they're all chucking switching noise onto the mains.

    Reduce all that switching noise, inaudible though it is, and your audio equipment will sound better.
    That's external to the equipment, though. I'm talking about noise generated within the audio equipment itself, which is an entirely separate issue. I'm theorising that this is the reason that cd players with high quality power supplies outperform those with 'just adequate' supplies.

    The only smps I have that is active when the hi-fi is on is the router.
    Martin



    Current Lash Up:

    Technics SLP1200 CD Player * NVA P90SA passive pre / Krell KSA50S Power amp * JM Lab Electra 926 loudspeakers *


    'This is the sort of music I'd be listening to if I was going shopping for a training bra.'

  7. #87
    Join Date: Apr 2008

    Location: Warrington

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    I'm Neil.

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    Quote Originally Posted by Macca View Post
    That's external to the equipment, though. I'm talking about noise generated within the audio equipment itself, which is an entirely separate issue. I'm theorising that this is the reason that cd players with high quality power supplies outperform those with 'just adequate' supplies.

    The only smps I have that is active when the hi-fi is on is the router.
    Yeah I agree with this, there's only a certain level of performance you're going to get with a couple of regulators feeding multiple chips.

    Also how the equipment deals with the noise coming in is important, and in digital, how RF return currents / ground bounce are controlled is paramount. As an example my DAC has balanced mains built in, 9x transformer windings feeding 9x supplies, and each of those supplies is zero feedback and uses 3 stage (passive) common mode filtering. Overkill? I don't think so...
    Mana Acoustics Racks / Bright Star IsoNodes Decoupling >> Custom Silent Media Server >> Halide Bridge USB (with AQVOX USB power) >> Pedja Rogic's Audial Model S DAC + Pioneer PL-71 turntable / Vista Audio phono-1 mk II / Denon PCL-5 headshell / Reson Reca >> LFD DLS >> LFD PA2M (SE) >> Royd RR3s.

  8. #88
    Join Date: Apr 2008

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    Quote Originally Posted by Stratmangler View Post
    That's what I did too.
    Ferrite clamps on everything but the audio system. The audio system doesn't need filtering because all the PSUs are linear, and don't exhibit the high frequency switching noise.
    What about all the RFI that rides on the mains?
    Mana Acoustics Racks / Bright Star IsoNodes Decoupling >> Custom Silent Media Server >> Halide Bridge USB (with AQVOX USB power) >> Pedja Rogic's Audial Model S DAC + Pioneer PL-71 turntable / Vista Audio phono-1 mk II / Denon PCL-5 headshell / Reson Reca >> LFD DLS >> LFD PA2M (SE) >> Royd RR3s.

  9. #89
    Join Date: Nov 2008

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    Quote Originally Posted by Yomanze View Post
    What about all the RFI that rides on the mains?
    The SMPS noise is RFI, just with a limited range of frequencies.
    The local problem is the amplitude of it, and ferrite clamps improve the situation.
    Chris



    Common sense isn't anymore!

  10. #90
    Join Date: Apr 2008

    Location: Warrington

    Posts: 3,072
    I'm Neil.

    Default MacBook used in a Digital system

    Quote Originally Posted by Stratmangler View Post
    The SMPS noise is RFI, just with a limited range of frequencies.
    The local problem is the amplitude of it, and ferrite clamps improve the situation.
    Ah now the increased amplitude of in home RFI vs. the AC lines makes sense to me. Thanks.

    Have been looking into lining my DAC and server with ERS paper from Stillpoints, anyone tried it?
    Mana Acoustics Racks / Bright Star IsoNodes Decoupling >> Custom Silent Media Server >> Halide Bridge USB (with AQVOX USB power) >> Pedja Rogic's Audial Model S DAC + Pioneer PL-71 turntable / Vista Audio phono-1 mk II / Denon PCL-5 headshell / Reson Reca >> LFD DLS >> LFD PA2M (SE) >> Royd RR3s.

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