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The Zishan dsd's corner

Discussion in 'Portable Source Gear' started by neog007, Nov 17, 2016.
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  1. Draknodd
    I have a quite annoying problem on my dsd 4497: the EQ just does not work at all.
    Tryed reflashing firmware (0.4i) multiple times, tryed using 180eq cfg files but nothing.
    Has anyone experienced the same problem?
    HeyManslowdown97 likes this.
  2. Denystafa
    Audio note & ad797 its a best pair
    endia likes this.
  3. Ivan TT
    It would not work on DSD files if that’s what you are listening to...
    HeyManslowdown97 likes this.
  4. DBaldock9
    I can't remember which other thread that I was reading (Cayin or Shanling), but I believe it was mentioned that the EQ on those would only work on "standard" (CD quality) tracks, and not HD tracks, due to the processing power requirements.
    Does anyone here know for sure that the Zishan DSD can apply EQ to HD (above 16-Bit/48-KHz) tracks?
  5. endia
    exactly, that's my setup too :)
    second row by opa627..
    Last edited: Sep 25, 2019
  6. Themilkman46290
    Yep, eq only works on flac, mp3
  7. Draknodd
    Yep you are right, EQ works only with 16bit files.
    I have found a workaround to have EQed music on the zishan without downsample everything and with a better equalization:
    Build your HP equalization curve with RePhase (lower the gain before exporting), export it as a FIR filter (32/64bit float txt), then apply the convolution FIR filter to all songs with SoX. No need EQ if the files are already equalized :D
    It's a good solution only if you use zishan with only a single pair of Headphones

    I write an example below just in case someone wants to do the same.
    Batch script for windows -> you drag on it all the songs and the result will be in "\converted" folder.

    1st ex: import pcm file, upsample to 24/48 with max quality settings, apply convolution in 32bit float, export in flac
    cd %~dp0
    mkdir converted
    FOR %%A IN (%*) DO sox -V4 -G -S %%A -b 24 "converted/%%~nA.flac" rate -v -s -I 48000 fir coeffs.txt
    2nd ex: import pcm file, apply 32bit float convolution, convert, apply noise filter and export in DSD64
    cd %~dp0
    mkdir converted
    FOR %%A IN (%*) DO sox -V4 -S %%A -t dsf -b 1 "converted/%%~nA.dsf" fir coeffs.txt rate -vInt 2822400 sdm -f clans-8
    Enjoy :D
    Last edited: Sep 26, 2019
    DBaldock9 and HeyManslowdown97 like this.
  8. oneula
    dumb question,
    but I have the DSD Pro AK4497
    I want to connect it via the Coaxial out to the Coaxial in of my XDuoo XD-05 but most coaxial audio cable don't have the 3.5 SE type plug.

    What kind of cable can I use?
    Just the standard 3.5 SE interconnect or something else I need?
  9. Merlin-PT
  10. Draknodd
    Sometimes in my head grows some strange and crazy idea. First a pair of questions:
    Has anyone written down a full schematic of the zishan dsd?
    At what gain are set lpf opamp?

    My main idea is to remove from the audio signal path everything after the LPF opamp, raise the power with a current buffer, BUT I need to know at what voltages the op275 are driving headphones, because if it is too low maybe a voltage gain stage is necessary. And keep only the balanced output, because atm i have only one pair of IEM and one of Full-size planars both with 2.5trrs jack. And the zishan power output is often not enough. After the project stage the main idea is to first use matrix board and then just order a custom pcb to put over the cleaned zishan pcb

    @Ivan TT
    DBaldock9 and Themilkman46290 like this.
  11. Ivan TT
    Try removing x4 output resistors on 2.5mm output, this may solve the issue.
    I'm not 100% certain but I think LPF has gain of 2, but since the balanced output is bridged (borrowing the term from PA world) it's above my current level of understanding to predict the output voltage swing, sorry.
    DBaldock9 likes this.
  12. Merlin-PT
    You can increase lpf gain (output voltage) if you want, you need to change the gain resistors.
    zishan lpf has gain of 2, but ak4497 datasheet lpf uses a gain of 3:
    Personally I didn't need more gain with my earbuds, so I didn't try to increase the gain.
    If you want to change the balanced output after the lpf, I suggest to do it outside of the player in a separated circuit connected to the 2.5mm jack, then if you like the result you can implement it inside.
    Last edited: Sep 28, 2019
    HeyManslowdown97 and DBaldock9 like this.
  13. Draknodd
    Very smart advice to use jack as input for the testing circuit.
    Resistors before jack already removed, still need more juice.
    Unluckily my multimeter passed away :frowning2: need to buy a new one. Ideal would be 4volts at the output for my full size headphones. In these weeks I'll do proper testing.
    Thanks for the advices :wink:
  14. gazzington
    So is the dsd still the best zishan or is the T1 better?
  15. neog007
    Merlin-PT likes this.
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