Adding an external USB DAC to your Egreat for HQ & SACD/DSD playback

Discussion in 'Functions Operation Guidance' started by Nice Monkey, Nov 13, 2018.

  1. Nice Monkey

    Nice Monkey Active Member

    Got myself a DIY-kit USB DAC and use USB Audio Pro Player APP together with it. The main reasons are getting native SACD/DSD playback and true gapless playback specifically for live recordings. Will gradually add my findings here after using it a lot more (sounds just great)

    Maybe something for Egreat to start selling for music lovers not having all the money in the world?

    This is a solid DAC design around the SABRE ESS ES9038PRO chip using quality components with over-sized dual linear PSU's, including a front display and even a remote control (not really needed). My ordered gold bundle 2 version is € 410 fully assembled, tested and inclusive taxes. One can also get all components separately for true DIY custom builds at much lower costs specifically when using cheaper standard components.

    Using the remote control one can easy choose the Digital Filter (7) for PCM conversion and the low-pass band filter (4) for DSD conversion:
    - The Digital Filter is set at the "fast roll off minimum phase filter" for minimal audible impact.
    Default was "fast roll off linear phase filter"
    - The Analog Filter is set at "47 kHz" for maximum high frequency filtering.
    Default was "60 kHz".
    The design apparently saved on non-volatile storage as settings are not sticky when powered off. One needs to re-apply them after power-on. Honestly if it is worth to do so???
    With the remote also the output volume can be controlled and mute be switched on/off.
    It does not allow other ES9038PRO parameters to be altered. The defaults applied seem to be doing the correct job though and without stickiness not very useful in practice anyway.

    What differentiates this unit mostly from (very) expensive branded DAC's is the use of the internal ess-es9038pro digital filters rather than a custom designed DSP based proprietary digital filter. It should be very challenging to hear the difference as each new SABRE version of their ESS series DAC's improved and added more digital filters to choose from (this one has even 7). Be aware those digital filters are for PCM => Analog conversion only. For true DSD => Analog conversion (like this chip does) only simple low-pass filters are used instead and all talk about advanced digital filtering simply does not apply.
    Expensive DAC versions also may use 2 ESS9038 Pro chips being one for the Left Channel and the other one for the Right Channel. SABRE DAC's are 8-channel capable but to compensate design tolerances for 24-bit conversion, ESS9038 designs often bundle 4 or 8 channels to a single output. This averages out component tolerances to a certain degree. Hence the deployment of one or two chips for stereo output only. Full HT 8-channel DAC's often use 4 SABRE chips for exactly that same reason. We see this 4 chip design above all in top of the line UHD-BD players with discrete 8-channel analog outputs.
    The DIY kit has design flaws too: The 240V section is not fused and worse it is not being low-pass filtered. As a consequence it is audible sensible to line-voltage spikes. One needs to add those components self which is more of a mechanical challenge to get it all fitted.
    When connected to my AMP the S/N ratio is extremely good as even turning up the volume to the maximum does not produce any audible noise at the speakers even at extreme close range.

    The integrated alternatives:
    The unit is far superior regarding HW design to the DAC audio panel included with Zidoo X20 Pro e.g that one is using the ES9038q2m (mobile version) not the PRO chip and a simple PSU and AMP design. Also important it is a lot more flexible as it has both SPDIF (coax plus optical) and USB external inputs. This enabling it to be used with other sources and other media players.

    For those familiar with Eweat the DAC build is very close not to call it identical to the DAC included in their € 900,- Eweat R11 design. Eweat is not using all best available components as standard oscillator and AMP's for that main board are used. This can be seen using the zoom feature on the link attached.
    The design includes external inputs via SPDIF and AES. Eweat R11 also includes an extra 12V Trigger plus IR In/Out panel and an additional Headphone panel (for those asking what all those other components are). They also included the 240V filter/fuse panel missing in my own design. Overall it is very complete and most likely sounds close to identical.

    A full alternative to my DIY kit is the new Dune HD Ultra 4K player which seems to be using the same audio boards and PSU´s as the Eweat R11 but advertised to deploy only top quality components on those. Functionally the audio/DAC section and other features are identical to the Eweat R11 audio but obviously the players FW is very different. It is very expensive though list priced at a whopping € 1.500.
    Very interesting move from Dune. The first Dune HD Ultra 4K announcements and pictures where clearly a clone of the Zidoo X20 Pro but the product actually launched now is a clone of the Eweat R11 instead. This design again uses the same DAC/PSU basis as my DIY kit. In contrary to Eweat Dune is going for the best posible result with that design also using top quality components for both the DAC and PSU´s (according to their specs). The final design regarding components used probably is even superior to the DIY kit. Did not see an interior picture yet but I do believe them here also seen the price asked for the player.
    It is using the standard XMOS audio processor for internal USB interfacing instead of the Amanero option of my DIY limiting audio rates to SPDIF limits also internal.

    USB Audio Player Pro (FW 4.4.1)
    This APP was tested on my Egreat A11 successfully. No OS or platform compatibility problems found. It will also work without an USB DAC being attached but it was designed specifically for that deployment. Installed it on my Egreat A11 without it using the default Android Audio driver included (=48 kHz 16-bit output for all source formats).

    - Paid the license (about € 7,-) via the Google Play Store and it got activated automatically. Using the same Google account it can be installed that way also on other Android platforms if you have multiple like I do.
    - Support for almost all Stereo HQ Audio sources including DSD/SACD formats makes this APP also special. Currently only missing support for DST compressed DFF files. DST is very effective as it reduces DSD lossless to about 40% of the original size. Files in fact are smaller that FLAC (172.4 KHz 24-bit) for the same source. Playback is gapless.
    - It next does not play DTS-CD's which is not that strange as that is actually using the DTS audio standard which is part of Video players.
    - It does not down-mux multi channel sources (FLAC) to stereo output using the Android drivers. Using an USB DAC content is sent to it untouched and my DAC will down-mix MCH output to stereo. So no MCH SACD sound support but yes these SACD can be played too.
    - The players UI needs some time getting used to. It e.g. uses all 4 corners for scattered controls. Forget using a standard remote. Using Hicontrol to control it works but has some quirks using it. Combining it with any Egreat remote works as the missing pointer mouse actions can be done using touch screen operations.
    - All sources are played truly gapless which is always nicer and essential for live recordings!
    - It is clearly designed for Smart Phones with a touch screen. Using a pointer mouse with a TV for display is essential in the current state. I registered myself on their forum and asked among-st other things for added Media Player support using a standard remote.
    - But honestly it is already unique that native DSD is supported with USB DAC's in many flavors.
    - It also works with wired Ethernet, NAS and external and internal HDD's connected which is often a problem with APP's designed for smartphones. Took me a while to find out how to scan folders on those HDD's as they where not found for that action (Manual).

    The player is around for several years already and is praised for the sound it can produce. True gapless playback for formats supported seems stable including CUE sheets. It also has an active forum and ongoing software development.

    ONKYO HF Player (FW 2.4.0)
    This is a real alternative player to be used with external USB DAC's. Worked straight with my setup too. For HQ playback the license is € 9,50 for SQ playback it is free (with minimal advertisements).
    Also this APP is really designed for Smart-Phones and needs also to be controlled using a pointer-mouse, which next works just fine. Differences are:
    - There is also the free version reducing playback to SQ but still handling all albums including SACD DSF and DFF.
    - Very smooth on the controls and actions. Playback is gapless.
    - No support for SACD ISO directly just DSF and DFF track extractions.
    - Can toggle USB DAC or HDMI outputs via setup.
    - Plays MCH SACD also via HDMI (Down muxed)
    - Can real-time convert PCM to DSD which I have never seen before!
    There is still development for this player but no forum.

    Practical functional experiences
    Installed it and next connected via USB2 (with a USB-hub in-between). After toggling some settings in the USB Audio Player Pro almost all my audio formats come out as they should except for:
    - DTS-CD (the alternative via HDMI is just fine for me as that is really MCH)
    - SACD using DFF tracks with DST compression (not really a commonly used format, but yes it is very efficient on HDD space)
    Got PCM 24-bit sample rates up to 384 kHz and DSD up to DSD128 working via USB. UP-sampling is also available as an option with USB Player Pro but not used by me. Finally can compare native DSD64 with FLAC 88.2 conversions.

    Practical sound experiences
    Obviously my findings here are subjective like hell, but most should be common for many.

    Sound quality perceived depends on: Quality of the Album ==> Speakers ==> Amplifier. The role and sense of an External DAC depends on that. I try to invest my good money smart in that sequence.

    With good quality speakers and medium range Home Theater AMP as a start it makes sense to add a high quality External DAC.
    My AMP for comparison is an Onkyo TX-RZ720 which works just fine. It has a decent AKM AK4458 DAC built-in but plays in a different league.

    a) For most CD's played in MP3/FLAC format the audible difference is minimal.
    For very good recordings it may be perceptible doing blind checks.
    b) For most SACD played in native DSD the reverse is true.
    Most will sound noticeable better using the DAC (and far better than the CD).
    Also the difference between converted to FLAC tracks and the native DSD tracks of the same recording can be heard clearly.
    c) Using Onkyo HF Player there is an option to convert PCM => DSD which works remarkable well with my DAC including MP3's.
    Output just sounds more crispier and clearer that way. Blind tests with visitors showed it was heard not only by myself. For quality CD recordings the difference is bigger than for cheap collection CD´s but the difference is always audible.
    This may open a new line of discussions for audiophiles as this way no digital filters are used/needed at all anymore.
    If one already has a very nice and expensive Pré-Amplifier it may not make a difference as the build-in DAC might already be a nice match for the DIY kit?

    For DTS-CD and (Pure Audio) BD albums I prefer the Multi Channel sound of my AMP above the 2-channel down-mixing via the External DAC for most albums. MCH SACD is not that easy as it varies per recording but often I prefer MCH (alas only getting that with this setup currently via FLAC).

    I like the UI of Egreat Music Player far better. When it reaches the same stability and functionality will use it for all my music for sure. I now use both music players APP's depending on the source being played:
    - DTS-CD and MCH FLAC via my AMP using HDMI with Egreat Music Player 2.0
    - SACD via the DAC with Onkyo HF Player (Analog RCA to my AMP)
    - SQ tracks including MP3's via Onkyo HF Player and the DAC with PCM => DSD conversion.

    Bottom-line I am very pleased with my setup/purchase. It was a bit of a gamble but worked out just fine.

    Attached Files:

    Last edited: Mar 22, 2019 at 8:23 PM
    Foei likes this.
  2. Nice Monkey

    Nice Monkey Active Member

    The review was updated with mainly additional findings and experiences. Above all using PCM => DSD conversion for all tracks including simple MP3's was a surprise to me.
  3. Nice Monkey

    Nice Monkey Active Member

    Updated with Dune HD Ultra 4K as an alternative. Also updates made with additional information in general.

    This is something Egreat could do as well avoiding an own design. A14?
    Last edited: Mar 15, 2019

Share This Page