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  1. #11
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    Quote Originally Posted by JohnB View Post
    Call me silly but I've been toying with trying a Metrum Ambre and replacing the Roon card with picoreplayer (Metrum are happy users to do that). The reasons: I already have a Metrum DAC so it will match (yes, silly), a variety of outputs including I2S, the Ambre seems to have had good reviews, no need to worry about various power supplies.

    Drawbacks: price.
    I briefly looked this unit up and correct me if I'm wrong, but doesn't this unit have a Raspberry Pi inside of it ??

  2. #12
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    Yes, it does have a Pi inside it (as does the even more expensive Bryston BDP-Pi box). On the other hand it includes good quality linear power supplies, 4 ouput options (RCA/AES/Optical/I2S), an attractive substantial case, a warranty, customer support, and the box will have a resale value.

    I fancy testing out the various upsampling options advocated by John Swenson here and described by Archimago in his blog. As far as I can tell, the easiest way of doing this is via picoreplayer (which simplifies setting the Sox options) and Pi based boxes.

    The options then boil down to:

    Build my own Rasp Pi + HiFiBerry DigiPro + Case + Power supply. Then I start investigating power supplies. Do I really want to start modifying the DigiPro board to accept a good external power supply (which seemingly makes a noticeable different - whether it is worth doing that is another question).

    Perhaps the Allo DigiOne Signature + their Shant power supply which would cost, in the UK, 577 USD or around ú480.

    Or perhaps the Metrum Ambre - which has got more expensive following the drop in the Pound. I already have a Metrum DAC and could use the I2S option.

    I'm still vacillating between the options but will read up on things a bit more before (hopefully) making a decision.
    Allo Digione Signature (+LiFePo Batteries), Touch, Metrum Jade, Bryston B4 SST2, PMC OB1i speakers, HP Proliant Microserver/Ubuntu, PC/Windows 7, iPad 4, iPeng, Squeezepad.

  3. #13
    Senior Member DomieMic65's Avatar
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    Very interesting post and links.
    Upsampling is the next chapter in my reading and learning about LMS / squeezelite / piCore... hehe!!

    Can upsampling be set to effect pcm signals only and leave DSD as is?
    Thnx
    Main system: Synology DS115j/RPi3b(LMS)/RPi3B+[LnrPS](piCore)/M2Tech EvoDAC Two+[LnrPS]/Densen DM20&30/Spendor SP2/3E
    Head-Fi: Schiit Vali2/Sennheiser HD600 & HD25Alum/Audeze Sine.
    Aditional HW: Allo DigiOne, iFi iDefender, iPurifier, iPower

  4. #14
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    I'm not sure, but (from my little knowledge) upsampling DSD doesn't seem to make sense - so it might well only upsample PCM.
    Allo Digione Signature (+LiFePo Batteries), Touch, Metrum Jade, Bryston B4 SST2, PMC OB1i speakers, HP Proliant Microserver/Ubuntu, PC/Windows 7, iPad 4, iPeng, Squeezepad.

  5. #15
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    There is an interesting article and (especially) video about Raspberry Pi being used for audio, examining the Raspberry Pi alone, the Pi with a HAT board, the Allo Digione and finally the Allo Digione Signature.

    Very instructive indeed - well worth reading and, especially, watching the video.

    https://darko.audio/2018/11/a-short-...one-signature/
    Allo Digione Signature (+LiFePo Batteries), Touch, Metrum Jade, Bryston B4 SST2, PMC OB1i speakers, HP Proliant Microserver/Ubuntu, PC/Windows 7, iPad 4, iPeng, Squeezepad.

  6. #16
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    Quote Originally Posted by JohnB View Post
    The options then boil down to:

    Build my own Rasp Pi + HiFiBerry DigiPro + Case + Power supply. Then I start investigating power supplies. Do I really want to start modifying the DigiPro board to accept a good external power supply (which seemingly makes a noticeable different - whether it is worth doing that is another question).

    Perhaps the Allo DigiOne Signature + their Shant power supply which would cost, in the UK, 577 USD or around ú480.

    Or perhaps the Metrum Ambre - which has got more expensive following the drop in the Pound. I already have a Metrum DAC and could use the I2S option.

    I'm still vacillating between the options but will read up on things a bit more before (hopefully) making a decision.
    Well, I have narrowed it down to:

    Allo DigiOne Signature
    Initially with their battery pack (approx ú328 total) but preferably moving on to a Lithium Iron Phosphate 6V battery + charger.
    Alternatively a SBooster BOTW linear power supply but that would add another ú330, bringing to total to ~ú660 - quite a substantial amount.
    Pros:
    Very good reviews and measurements (e.g. https://www.audiosciencereview.com/f...i-s-pdif.5418/ ), I could buy a backup 3B+ board in case of early failure of that board due to it running hot.

    Cons:
    Not very attractive visually (understatement), needs an additional ugly power brick or battery, 2 power supplies, no easy way of passively cooling the Pi board.

    Metrum Ambre
    Cost ~ú1,000
    Pros:
    Attractive substantial case, RCA/Optical/AES/I2S outputs, very well reviewed, it's plug and go (apart from picoreplayer SD card), guarantee, resale value, single case.

    Cons:
    Cost, designed around Roon but Metrum approve of running other distributions such as PCP.
    Normally I would expect a piece of good quality audio kit to last for a very minimum of 10 years but the Pi board runs pretty hot which might well limit its life and although the Ambre uses a 3B+ board I'm not sure whether it is a standard board (it might be modified).
    Allo Digione Signature (+LiFePo Batteries), Touch, Metrum Jade, Bryston B4 SST2, PMC OB1i speakers, HP Proliant Microserver/Ubuntu, PC/Windows 7, iPad 4, iPeng, Squeezepad.

  7. #17
    Senior Member Julf's Avatar
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    Quote Originally Posted by JohnB View Post
    There is an interesting article and (especially) video about Raspberry Pi being used for audio, examining the Raspberry Pi alone, the Pi with a HAT board, the Allo Digione and finally the Allo Digione Signature.

    Very instructive indeed - well worth reading and, especially, watching the video.

    https://darko.audio/2018/11/a-short-...one-signature/
    Usually anything by Darko should carry a big woo warning.
    "To try to judge the real from the false will always be hard. In this fast-growing art of 'high fidelity' the quackery will bear a solid gilt edge that will fool many people" - Paul W Klipsch, 1953

  8. #18
    Senior Member Julf's Avatar
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    Quote Originally Posted by JohnB View Post
    On the other hand it includes good quality linear power supplies.
    Linear supplies for high-speed digital circuits are usually a pretty bad idea. Not sure what the benefit is supposed to be.
    "To try to judge the real from the false will always be hard. In this fast-growing art of 'high fidelity' the quackery will bear a solid gilt edge that will fool many people" - Paul W Klipsch, 1953

  9. #19
    Senior Member Apesbrain's Avatar
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  10. #20
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    I'm not sure that it could be called "the best audiophile hardware" (whatever that means) but I have finally plumped for the Allo Digione Signature, mainly because the options of how to set it up have been running round in my mind for a few days. Having said that, I suspect the Signature with a battery pack power supply might well give the Metrum Ambre a run for its money.

    Initially I will use the (crappy) battery pack for the clean side but move to a LiFePo 6.6V (2S2P) battery pack with a XT60 termination (for the charger) -> a XT60 to 5.5/2.5 lead -> Allo's 5.5/2.5 to USB-C connector.

    There is a German specialist supplier of Lithium batteries who makes custom battery packs to customer's specifications, for a price. (I had considered buying the "A123 Systems ANR26650M1B" LiFePo cells and making the pack myself.)

    This is definitely not a cheap option once you add it various bits and bobs - even before the LiFePo battery pack and charger.
    Last edited by JohnB; 2019-08-28 at 11:57.
    Allo Digione Signature (+LiFePo Batteries), Touch, Metrum Jade, Bryston B4 SST2, PMC OB1i speakers, HP Proliant Microserver/Ubuntu, PC/Windows 7, iPad 4, iPeng, Squeezepad.

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