The Zishan dsd's corner

[InvisibleInk]

Is meant to work with a cable with 3.5mm on one end and coaxial on the other? A cable like this:

https://www.ebay.com/itm/Digital-Co...RCA-to-3-5mm-Jack-Male-for-HDTV-/153434488368

I'm confused about it's application. Is there a different electrical specification from the line out on the top?

When it comes to this type of connection, I confess to being a noob.

 

[citral23]

The Dual AK4497 has the same circuit as the Single AK4497 - a pair of OP275 op-amps doing the 4 channels (L+, L-, R+, R-) of Low Pass Filtering, driving the input of the socketed op-amp, and driving the 2.5mm TRRS Balanced Output jack (through 22Ω resistors).
.
Since the output of the AK4499 is different, their Low Pass Filter circuit design apparently doesn't have the same Current output, which means it can't correctly drive Headphones.

Excellent pcb analysis as usual, thx.

 

[citral23]

Is meant to work with a cable with 3.5mm on one end and coaxial on the other? A cable like this:

https://www.ebay.com/itm/Digital-Co...RCA-to-3-5mm-Jack-Male-for-HDTV-/153434488368

I'm confused about it's application. Is there a different electrical specification from the line out on the top?

When it comes to this type of connection, I confess to being a noob.

Coaxial is digital signal through a copper cable, so it bypasses the amp stage and you just get the digital output of the dac itself. I've never used it and don't see any situation I'd want to use that, so no idea which cable is right tbh.

 

[InvisibleInk]

Coaxial is digital signal through a copper cable, so it bypasses the amp stage and you just get the digital output of the dac itself. I've never used it and don't see any situation I'd want to use that, so no idea which cable is right tbh.

Great, Thanks!

 

[Leonne]

just tried the new 0.4M firmware. must say that i like this update, the best one to handle heat problem on zishan, didn't have any trouble so far.

sound wise, the 0.4 K & L kinda cut on upper mid section and smooth things out to follow the trend of current Chifi DAP where they leaning on more refined sound, IMO they kinda kill the dynamic range in the previous update. They did it right this time, my favorite is on the bass. im a treble head but i seriously appreciate how they did the bass, it become well textured and detailed so it doesn't only sounded "boom boom" on the bass, it become well shaped this time.

I know results may vary since people mod their zishan differently, but i think this is the update i can recommend after quiet a while

 

[citral23]

Yes 0.4m seems to run cooler than 0.4i for me.

For those who don't know, turning off the spectograph helps a lot because even with screen off it's running in the background and uses CPU btw, so just display album art instead.

 

[DBaldock9]

General question here - How do y'all think the different Firmware revisions are changing the sound of the analog audio output, if the EQ is Off - when the actual Digital to Analog conversion is being done by the DAC chip(s), and not the CPU chip?

 

[Area511]

Is there a way to get a unbalanced signal out of the DSD with single 4497 after the LPF?

 

[Merlin-PT]

General question here - How do y'all think the different Firmware revisions are changing the sound of the analog audio output, if the EQ is Off - when the actual Digital to Analog conversion is being done by the DAC chip(s), and not the CPU chip?

Digital to analog is only done inside the dac, but the cpu is used to configure the dac with several dac parameters.
I really dont know the details.
Also the cpu is used to uncompress and read the several file formats and that could use different libs, ie, I don't know if bugs or math precision compromises were made for any kind of trade off, maybe not, but sometimes code can be improved and bugs found.

 

[DBaldock9]

Is there a way to get a unbalanced signal out of the DSD with single 4497 after the LPF?

The Single AK4497 DSD does have a 3.5mm TRS Single-Ended Output - but, it doesn't come directly from the OP275 op-amps that do the LPF. Instead, they feed the input of the socketed op-amp, and its output goes to a discreet transistor stage, before passing through the large capacitors, and series resistors, to finally emerge at the 3.5mm jack. The DSDs model has a separate 3.5mm Line Output, but I haven't traced the circuitry for that.

 

[Area511]

double

 

[Area511]

According to the diagram it's a coaxial (SDIF?) on the second 3.5mm:

Also mentioned on top of this page.
Is there no way to get a Stereo "Line-Out" after the LPF?

 

[citral23]

General question here - How do y'all think the different Firmware revisions are changing the sound of the analog audio output, if the EQ is Off - when the actual Digital to Analog conversion is being done by the DAC chip(s), and not the CPU chip?

Unless some firmware versions introduce errors in the on-the-fly decompression of the music files, which is doubtful as it would probably sound very noticeably glitchy, I don't think there's any difference and people hearing things is probably more a testament of the inherent bias of humankind than a measurable reality.

After all, I found a guy who thinks changing the orientation of a fuse in its socket impacts the sound of his hi-fi setup

 

[maxifuny]

How do y'all think the different Firmware revisions are changing the sound of the analog audio output

In fact, the firmwares gives a different sound. The first option from the oldest to G. Further firmware from i to L. And now the M firmware, in which the sound is different.

It is also worth noting that there are many revisions of motherboards in DSD - more than 10. At the moment, the controller has also been replaced with a newer one, so the firmware is partially incompatible with each other.
The other sound is normal. But not the fact that it is connected only with the firmware

 

[maxifuny]

the orientation of a fuse in its socket impacts the sound of his hi-fi setup

I know people who believe that the right piece of wood underneath a power amplifier improves the overall sound of the system. it is not even included in the electrical circuit!