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  1. #1
    Senior Member
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    Jan 2021
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    DAC32 low-cost high performance music streamer

    We are long-time fans of Squeezebox and have followed the SqueezeAMP, and in particular the Squeezelite-ESP32 project, with great interest.

    These efforts have inspired us to design and build our own new hardware to run Squeezelite-ESP32 software. Our idea was to manufacture an inexpensive music streamer along the lines of the now discontinued Chromecast Audio puck, but with much better sound quality and running Squeezelite, so it can be used as a fully-fledged Squeezebox Player.

    We also benefit from a significant advantage, because we have all of the equipment to manufacture and test the product in our facility just outside Berlin Germany. This has been key to enabling us to keep the selling price really low at just 50€ including VAT. This includes a complete fully assembled and pre-flashed product in a neat housing which is ready to use out-of-the-box. The package also includes a DC jack to USB-A cable to connect to a USB power supply of choice (a power supply is not included)

    The design is based around an ESP32 module which feeds a PCM5122 DAC and runs on Squeezelite-ESP32 software. A lot of attention has been paid to internal filtering and fine tuning the layout for optimal HiFi performance. DAC32 also supports file formats of up to 24/192 resolution. Listening tests, backed up by measurements using our own audio analyser, confirm that these objectives have been met. We are particularly proud of achieving an outstandingly low signal to noise ratio of -110dB

    The analogue line output is via a pair of gold-plated RCA phono sockets and is designed to connect directly to a HiFi amplifier, active speakers or soundbar.

    The DAC32 Music Streamer will start shipping early March 2021

    https://polyvection.com/en/product/dac32/

    https://youtu.be/pmqTgcCH4zM
    Attached Images Attached Images     
    Last edited by PolyVection; 2021-01-26 at 13:23. Reason: add link to pub assembly video

  2. #2
    Senior Member
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    Dec 2018
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    The Netherlands
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    Looks like a really nice product to me, and a perfect replacement for the Logitech Squeezebox Receiver. Also the price is good.
    PS: It seems there is a typo in the URL that is shown on the label at the bottom of the housing. But with the help of your username I found your website...
    Last edited by CJS; 2021-01-08 at 04:43.
    | LMS 8.1.2 | Squeezebox Boom | RPi0W + pCP 7.0.1 + HiFiBerry DAC Zero | SqueezeAMP |

  3. #3
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    Apr 2005
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    I expect that this will make quite a few people happy - in particular those that want to simply buy a box and plug it in.

    Is it pure Squeezelite-ESP32 ... meaning that users can simply update the firmware using the builds that the Squeezelite-ESP32 team release?
    Paul Webster
    http://dabdig.blogspot.com
    Author of "Now Playing" plugins covering Radio France (FIP etc), PlanetRadio (Bauer - Kiss, Absolute, Scala, JazzFM etc), KCRW, Supla Finland, ABC Australia, CBC/Radio-Canada and RTE Ireland

  4. #4
    Senior Member
    Join Date
    Dec 2013
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    111

    DAC32 low-costhigh performance music streamer

    > On 8 Jan 2021, at 12:40, Paul Webster <Paul.Webster.9v5o80 (AT) no-mx (DOT) forums.slimdevices.com> wrote:
    >
    >
    > I expect that this will make quite a few people happy - in particular
    > those that want to simply buy a box and plug it in.


    Agreed - the only thing which is now missing on the player front is AirPlay 2 support instead of only 1. I know - not their fault, but it would be really nice and I would buy it.



    >
    > Is it pure Squeezelite-ESP32 ... meaning that users can simply update
    > the firmware using the builds that the Squeezelite-ESP32 team release?
    >
    >
    >
    > Paul Webster
    > http://dabdig.blogspot.com
    > author of "now playing" plugins covering radio france (fip etc), kcrw,
    > supla finland, abc australia, cbc/radio-canada and rte ireland
    > ------------------------------------------------------------------------
    > Paul Webster's Profile: http://forums.slimdevices.com/member.php?userid=105
    > View this thread: http://forums.slimdevices.com/showthread.php?t=113633
    >
    >

  5. #5
    Senior Member Apesbrain's Avatar
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    Jun 2005
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    East Coast, USA
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    Very nice! Just give us an easy option to buy in the US, e.g. Amazon store. Maybe your next project can be a S/PDIF version.

  6. #6
    Senior Member kidstypike's Avatar
    Join Date
    Feb 2007
    Location
    Brindle
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    4,669
    WiFi only?

    How would one set this device up?
    Server - LMS 8.2.0 Pi4B 4GB/Argon one case/pCP 8.0.0 - 75K library, playlists & LMS cache on SSD (ntfs)
    Study - Pi4/pCP 8.0.0/Topping E30 DAC/Ruark MR1 Mk2
    Lounge - Pi2/pCP 8.0.0 > HiFiBerry DIGI+ > AudioEngine DAC1 > AVI DM5
    Dining Room - Pi3B/pCP/Bluetooth/Echo Show 8
    Garage - DAC32 > Edifier speakers

    Spares - 2xTouch, 1xSB Radio. 1xSB3, 6xRPi

  7. #7
    Quote Originally Posted by Apesbrain View Post
    Very nice! Just give us an easy option to buy in the US, e.g. Amazon store. Maybe your next project can be a S/PDIF version.
    Don't forget Amazon.ca as well for us Canucks!

    Price is reasonable, but from the website:

    "For orders with a total value below 100,- Ç we are using Deutsche Post Warenversand National or International."

    Not sure how much that would be to Canada, or what duty/taxes would be.

    Definitely interested though!

  8. #8
    Senior Member
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    Jan 2021
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    Quote Originally Posted by Paul Webster View Post
    Is it pure Squeezelite-ESP32 ... meaning that users can simply update the firmware using the builds that the Squeezelite-ESP32 team release?
    Yes, it basically is.
    We will ship with a custom compiled version of Squeezelite-ESP32 to have a little better control of the OTA updates. Meaning that we want to test each new community release before making it available to the DAC32 devices. Just to avoid that an accidentally released update can brick a large number of devices over night.

    Nevertheless it stays fully compatible with the community release and you can easily switch over to that one and not use our tested versions.

  9. #9
    Senior Member
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    May 2006
    Location
    Silicon Valley
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    644

    Great product idea...

    This looks great as a ready to use product, just throw it behind a powered speaker!

    I have a question however about the DAC implementation:
    The PCM5122 is getting it's reference clock from the ESP32 part and uses it's PLL?

    I am looking at the Allo MiniBoss DAC, which places this DAC part into master mode, and has two external crystals, 45 & 49 MHz, selecting one for sample rates that are a multiple of 44.1 KHz and the other for sample rates that are a multiple of 48 KHz. This strikes me as a good idea, can this be done in your product, would it improve performance such as lowering jitter?
    Living Room: SB Touch + DIY PSU > CI Audio VDA.2 DAC + VAC.1 PSU > VRX.1 cables > Emotiva XSP-1 Gen 2 preamp + XPA-DR2 amp > Blue Jeans cables > B&W 804 speakers
    Laptop: System76 Galago + Ubuntu 16.04 + Squeezelite + Vivaldi/Material Skin > Emotiva Little Ego DAC > Grado PS500 headphones
    Bedroom: RPi Zero W + Squeezelite > miniBOSS DAC HAT > Bose SoundLink Revolve
    Phone: Pixel 3a + SB Player + Material APK > Senn IE80 earbuds
    Server: Puget Systems Serenity + Ubuntu 18.04 + LMS 8.2

  10. #10
    Senior Member
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    Jan 2021
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    129
    Quote Originally Posted by Ron F. View Post
    I have a question however about the DAC implementation:
    The PCM5122 is getting it's reference clock from the ESP32 part and uses it's PLL?

    I am looking at the Allo MiniBoss DAC, which places this DAC part into master mode, and has two external crystals, 45 & 49 MHz, selecting one for sample rates that are a multiple of 44.1 KHz and the other for sample rates that are a multiple of 48 KHz. This strikes me as a good idea, can this be done in your product, would it improve performance such as lowering jitter?
    Yes, the clocks are directly coming from the ESP32 where the internal PLL is used.
    Our investigation showed that the ESP32 jitter level is pretty good and much better in comparison to e.g. a RPi.

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