The Zishan dsd's corner

[Themilkman46290]

OK. Thanks for the thread link. I have put it there then.

Thank you

 

[Setmagic]

Maybe some of You know this lovely place for all Zishan fans. I found this today

https://www.facebook.com/groups/624906874983953/?ref=share

 

[Themilkman46290]

Maybe some of You know this lovely place for all Zishan fans. I found this today

https://www.facebook.com/groups/624906874983953/?ref=share

They won't let me join

 

[Setmagic]

They won't let me join

I waited about 1hr to join. The old group with "... Enthusiast" on the end of name is probably no longer active.
This working perfectly!

 

[Themilkman46290]

I waited about 1hr to join. The old group with "... Enthusiast" on the end of name is probably no longer active.
This working perfectly!

Nope, they blocked me, happened a few months back, I joined, I was enjoying it, then waze disappeared, I can't look them up, kind of weird, don't know why they banned me but o well, screw them..

 

[Setmagic]

Nope, they blocked me, happened a few months back, I joined, I was enjoying it, then waze disappeared, I can't look them up, kind of weird, don't know why they banned me but o well, screw them..

I see 2 groups in similar names and sent request yesterday to join:

WAZE (Walnut And Zishan Engineering)
Open Public Group and i'm join in and have fun to read about modification.
and
Walnut and Zishan Enthusiasts (WaZe)
Closed or secret but they don't invite me and now i can't see page when i logged in, maybe also ban?

 

[oneula]

never had a problem with the WaZe FB group
tends to be mostly about hacks with the walnut and earlier Zishan Z1-3 models not so much on the DSD.
David B is an actve member.
Lots of info on opamp rolling and accessories.
Again not so much emphasis on the DSD or T1 series

 

[citral23]

There's the regular and the PRO version of ak4499, the difference being better opamps in the the PRO from what I've read.
ak4499 has 2 dacs inside, the result is better specs on paper than a dual ak4497.
ak4497 dual is more expensive than the the previous ak4497 single.

I can't recommend or comment because I don't have the new models.
You'll have to read the last pages of this thread, some users bought them.

Honestly, when doubling dacs you are just lowering the THDs to levels nobody human can discern compared to the single dac if it was already good (which the AK are). And the headphones have higher THDs anyway... So it's purely a marketing/crude paper numbers stunt.

I only got the dual ak4497 because of usb-c, but would've preferred a single version for better battery life.

 

[Setmagic]

Honestly, when doubling dacs you are just lowering the THDs to levels nobody human can discern compared to the single dac if it was already good (which the AK are). And the headphones have higher THDs anyway... So it's purely a marketing/crude paper numbers stunt.

I only got the dual ak4497 because of usb-c, but would've preferred a single version for better battery life.

Dual DAC also is must have for people who really want pure balanced systems DAC -> AMP -> headphones. As you see also balanced output have ~50-100% more power in mW and Vrms in same aplication if manufacturer decided to design audio rail symmetrically.

According to DSDs - better overall performance from factor than older DSD. 4499 version is also dual DAC but in one chip.
In heavy modification you can redesign old one to newer and make it to same quality but old DSD needs a lot more work for it.
Really want that skills for it...
I am that kind of audio enthusiast i can re-cable all things i have skills and equipment but i prefer to send my stuff to masters of audio modifications.
Its depends also to have in your mind that stuff is done 100% perfectly

 

[slavalun]

The dual DAC can be enabled in different ways.
So in the case of DSD4497 DUAL, the DACS are enabled according to the "dual mono" scheme, and in the case of DSD4499, the DACS can be enabled in parallel and in this case the use in a portable device gives a small effect. But the DSD4499 scheme is made so that on one DAC (not TURBO) there will be a signal swing
5.5 Vpp, and in the mode of operation of two ADCs in parallel (TURBO) ,there will already be a signal swing at the headphone output of 11 Vpp.
This can be fixed by making a small mod (which I suggested above).
This will allow you to significantly save energy and get the maximum signal swing in NON-TURBO mode, without compromising the device's performance.

 

[Merlin-PT]

However, you should know that DSD4499 has an inverted polarity
on the headphone output, that is, the phase is inverted 180 degrees and this is
wrong.

Hi,

The polarity is inverted in what outputs:
3,5mm PO, 3,5mm LO, 2.5mm balanced, all?

Is it a circuit design problem or firmware?

What effect does is have in sound ?

Can this be "fixed" by making a special pair of headphones/earbuds with both drivers soldered with reversed polarity ?

Thanks

 

[slavalun]

Hi,

The polarity is inverted in what outputs:
3,5mm PO, 3,5mm LO, 2.5mm balanced, all?

Is it a circuit design problem or firmware?

What effect does is have in sound ?

Can this be "fixed" by making a special pair of headphones/earbuds with both drivers soldered with reversed polarity ?

Thanks

The inverted signal is formed already at the output
of stage IV , then there is a NON-inverting circuit, so
the inverse signal will be at ALL outputs. In order to get
the correct polarity, you need to add
an inverting amplifier after stage IV, which inverts the signal by 180 degrees,
resulting in the correct phase (0 degrees).
I made such an amplifier on two AD8397S and got a great balanced
amplifier with the correct polarity.

http://player.ru/showthread.php?t=180748&page=424&p=3028387&viewfull=1#post3028387
http://player.ru/showthread.php?t=180748&page=425&p=3038019&viewfull=1#post3038019

https://ibb.co/LQbmPH7
https://ibb.co/9Ym3P0Q


I do not recommend soldering headphones, especially expensive ones! Today they are needed in one
player, tomorrow in another.

 

[Merlin-PT]

Thanks for extensive explaining the problem and your fix.

Yes, if we reversed polarity in some headphones/earbuds then they could only be used in this player.
It was more to test the correct polarity than to make a permanent solution.
In some earbuds with detachable cable, the reverse driver polarity could be made in the cable.
Just an idea for someone that can't make the fix inside the player.

BTW, I never tested/listen how reversed polarity sounds.

 

[slavalun]

Thanks for extensive explaining the problem and your fix.

Yes, if we reversed polarity in some headphones/earbuds then they could only be used in this player.
It was more to test the correct polarity than to make a permanent solution.
In some earbuds with detachable cable, the reverse driver polarity could be made in the cable.
Just an idea for someone that can't make the fix inside the player.

BTW, I never tested/listen how reversed polarity sounds.

What you offer is a "pseudo" solution.
In any case, the phase in time will remain inverted
180 degrees. And although the speaker diffuser will
move in the right direction in theory, we will get a phase - incorrect
sound in any case. If it were possible to do this, manufacturers have long
been making "special" headphones...
Because this is not the only way this player is made...

 

[slavalun]

BTW, I never tested/listen how reversed polarity sounds.

Some people even like this sound, it is not bright, high
frequencies are not so sharp. This polarity can mask a lot
of technical problems...
I perceive this sound as if I'm standing with my back to the source of the music.