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  1. #131
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    Quote Originally Posted by Heuer View Post
    Apparently the white case ones sound better
    Well, that's the one for me !

  2. #132
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    Quote Originally Posted by Heuer View Post
    With the (hopefully) imminent arrival of my DAC32 my thoughts wandered to a PSU for it. Polyvection say that any good USB 5V PSU/charger will be perfect and as I need one I happened upon this bit of research: https://lygte-info.dk/info/ChargerIndex%20UK.html

    Who would have thought!

    They have tested a huge number of these chargers and also measured the noise they produce. Best of the bunch is this one off eBay at ú10.99 inc P&P which has a noise level of 5mV rms and 106mVpp at 0.5A: https://www.ebay.co.uk/itm/5V-2A-AC-...AAAOSwgLFeknB5


    For those of you in the USA or EU the Apple charger A1400 produces even less noise at 0.5A with 8mV and 81 mVpp for about the same price. UK version is A1399:
    https://lygte-info.dk/review/USBpowe...pter%20UK.html



    Main page is here: https://lygte-info.dk/

    Another interesting review here: http://www.righto.com/2012/10/a-doze...le-is.html?m=1
    "Apple's power adapter is clearly a high-quality power supply designed to produce carefully filtered power. Apple has obviously gone to extra effort to reduce EMI interference, probably to keep the charger from interfering with the touchscreen. Beware of counterfeits!"

    Now, where is my DAC32?
    Good spot and yes its a 2 Amp supply, so more than enough power. You should not have too much longer to wait for your DAC32

  3. #133
    Senior Member Heuer's Avatar
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    Actually I replaced the Amazon AC/DC USB adapter used for my Topping E30 with the JHD one off eBay. I have a SB3>E30>Arcam Solo Mini>Anthony Gallo Micro's/TR-2 subwoofer in our kitchen and it is a lovely sounding system but the new 5V supply made a discernable improvement to my ears. I did look at the Topping P50 linear PSU which has a measured noise level of 1mV rms but not sure it is worth ú129 when the JHD adapter has a measured noise level of 5mV rms and probably gets most of the performance out of the DAC in what is usually a background listening system. None of the other adapters I tried on the E30 (LG, Google, Motorola, Samsung, generic) made any difference. I have an Apple one somewhere which I will try but I will probably spring for another ú10.99 JHD for the DAC32.
    Lounge: Transporter>Audio Synthesis DAX Decade>Audio Research LS22>Krell FPB300>Wilson Benesch Act 1's + 2 x Velodyne SPL1000 sub's
    Kitchen: SB3>Topping DAC>Arcam Solo>Anthony Gallo Micro's+Sub, Joggler controller
    Office: DAC32>Acoustic Energy AE1 Active's, Joggler controller
    Garage: Boom>QAcoustics 7000s subwoofer
    Bedroom: Radio
    Shed: Radio
    Workshop: Boom
    Garden 1: SB3>JVC amp>Rock outdoor speakers
    Garden 2: SB3>JVC amp>Rock outdoor speakers

  4. #134
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    Some words regarding power supplies and noise.
    While of course it is always the best to eliminate any noise directly on the root we built advanced noise rejection filtering into DAC32.
    It starts with a power input filter that cuts off any major spikes in noise.
    Another potential source of noise is the ESP32 module itself. RF devices usually can have very high peaks in power consumption during transmission and reception. Those peaks will basically translate into ripple on the power supply rail which is also some kind of noise. Again there is a special filter added that decouples that ripple voltage from the rest of the system.
    Last but not least there are too dedicated low noise power regulation LDOs that will supply the digital as well as the analogue part of the DAC.
    The one feeding the analogue part in an ultra low noise one which has a typical output noise of 30 ┬ÁV RMS and a ripple rejection of 45 dB.
    So while it is recommended using a high quality power supply we did our best to maintain best sound quality independent of it.

  5. #135
    Senior Member Heuer's Avatar
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    Someone has trodden this path before:

    https://www.youtube.com/watch?v=Kp2cGjscYKM

    Choosing the right SMPS can get you 80% of the performance of a LPS it seems. Many people will have a legacy Apple adapter lying around to try so a free and easy experiment!
    Lounge: Transporter>Audio Synthesis DAX Decade>Audio Research LS22>Krell FPB300>Wilson Benesch Act 1's + 2 x Velodyne SPL1000 sub's
    Kitchen: SB3>Topping DAC>Arcam Solo>Anthony Gallo Micro's+Sub, Joggler controller
    Office: DAC32>Acoustic Energy AE1 Active's, Joggler controller
    Garage: Boom>QAcoustics 7000s subwoofer
    Bedroom: Radio
    Shed: Radio
    Workshop: Boom
    Garden 1: SB3>JVC amp>Rock outdoor speakers
    Garden 2: SB3>JVC amp>Rock outdoor speakers

  6. #136
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    I'm sure I have seen somwhere that Ikea units are well regarded

    ronnie

  7. #137
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    Quote Originally Posted by Heuer View Post
    Someone has trodden this path before:

    https://www.youtube.com/watch?v=Kp2cGjscYKM

    Choosing the right SMPS can get you 80% of the performance of a LPS it seems. Many people will have a legacy Apple adapter lying around to try so a free and easy experiment!
    Hmm I wonder how the Samsung S5 and the Amazon Kindle power supplies compare

    Sent from my Pixel 3a using Tapatalk

  8. #138
    Senior Member Heuer's Avatar
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    My E30 was powered with an Amazon branded 5W supply (from the Kindle I seem to recall - they all blur) before trying the JHD one which is when I heard an improvement. After listening for about three hours last night and a couple of hours today I stand by the improvement in sound quality. Still hunting down my Apple charger which must be in use somewhere but plugged in behind cabinets or furniture. Incidentally these are the people who make the JHD charger: http://www.jhdpower.en.worldbuy.cc/

    I have every confidence the DAC32 has been designed to optimise sound quality and reduce injected noise but I wanted to give it the best start in life and as I have no spare 5V supplies decided to buy one. Polyvection said use a good one so I started searching.
    Lounge: Transporter>Audio Synthesis DAX Decade>Audio Research LS22>Krell FPB300>Wilson Benesch Act 1's + 2 x Velodyne SPL1000 sub's
    Kitchen: SB3>Topping DAC>Arcam Solo>Anthony Gallo Micro's+Sub, Joggler controller
    Office: DAC32>Acoustic Energy AE1 Active's, Joggler controller
    Garage: Boom>QAcoustics 7000s subwoofer
    Bedroom: Radio
    Shed: Radio
    Workshop: Boom
    Garden 1: SB3>JVC amp>Rock outdoor speakers
    Garden 2: SB3>JVC amp>Rock outdoor speakers

  9. #139
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    Feb 2011
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    Cheshire, UK
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    Quote Originally Posted by Heuer View Post
    My E30 was powered with an Amazon branded 5W supply (from the Kindle I seem to recall - they all blur) before trying the JHD one which is when I heard an improvement. After listening for about three hours last night and a couple of hours today I stand by the improvement in sound quality. Still hunting down my Apple charger which must be in use somewhere but plugged in behind cabinets or furniture. Incidentally these are the people who make the JHD charger: http://www.jhdpower.en.worldbuy.cc/

    I have every confidence the DAC32 has been designed to optimise sound quality and reduce injected noise but I wanted to give it the best start in life and as I have no spare 5V supplies decided to buy one. Polyvection said use a good one so I started searching.
    Is there a recommended 5W adapter with multiple USB ports? Ideally one that produces 0.5A
    VB2.4 storage QNAP TS419p (NFS)
    Living Room Joggler & Pi4/Khadas -> Onkyo TXNR686 -> Celestion F20s
    Office Joggler & Pi3 -> Denon RCD N8 -> Celestion F10s
    Dining Room SB Boom
    Kitchen UE Radio (upgraded to SB Radio)
    Bedroom (Bedside) Pi Zero+DAC ->ToppingTP21 ->AKG Headphones
    Bedroom (TV) & Bathroom SB Touch ->Denon AVR ->Mordaunt Short M10s + Kef ceiling speakers
    Guest Room Joggler > Topping Amp -> Wharfedale Modus Cubes
    Everything controlled by iPeng & Material on iOS

  10. #140
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    Cheshire, UK
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    Just seen this post elsewhere -> https://forums.slimdevices.com/showt...=1#post1011596

    One assumes a pre-built LMS server ....... Wow
    VB2.4 storage QNAP TS419p (NFS)
    Living Room Joggler & Pi4/Khadas -> Onkyo TXNR686 -> Celestion F20s
    Office Joggler & Pi3 -> Denon RCD N8 -> Celestion F10s
    Dining Room SB Boom
    Kitchen UE Radio (upgraded to SB Radio)
    Bedroom (Bedside) Pi Zero+DAC ->ToppingTP21 ->AKG Headphones
    Bedroom (TV) & Bathroom SB Touch ->Denon AVR ->Mordaunt Short M10s + Kef ceiling speakers
    Guest Room Joggler > Topping Amp -> Wharfedale Modus Cubes
    Everything controlled by iPeng & Material on iOS

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