[Setmagic]

DSDs with @maxifuny modifications sounds really impressive.
Can't tell much about replacing resistors in headphones output 3,5mm ~2,5Ohm instead 100Ohm resistors.
I don't make tests but seems to be softer and clear highs, punchy mid bass is gone and now more linear and polite.

After many modifications I can't force AD3 Tube-amp to sound as vivid and dynamic as DSDs 3,5 headphone out.

 

[Trespa]

Hi there! Enjoying my dsd for quite some time now. I've got the ak4497, since it can operatie as a dag for your desktop, is it possible to hook an android phone on it as a dac? Havnt been able to make that work

 

[Setmagic]

Hi there! Enjoying my dsd for quite some time now. I've got the ak4497, since it can operatie as a dag for your desktop, is it possible to hook an android phone on it as a dac? Havnt been able to make that work

It's not possible just like connect, and bad idea if it's will run due to extreme sound delay.
If You like Zishans just go for U1 model.
It's cheap, have big battery and good sound quality.

 

[raabje]

I have a question, I want to buy a Beyer Dynamics DT 250 (I know about the sonic differences and the imbalance problem). There is a 80 ohm and 250 ohm version . What would be the best match for the Zishan DSD players, and Z1 and Z3?

Will the 250 ohm version drain the battery more? I read somewhere Zishan needs 100 ohm or more for the best performance?

 

[Setmagic]

@raabje Zishan DSDs will drive any headphones up to 300 Ohms and better go for hi-impedance 80+ headphones for best performance.
If You have same model of headphones but different Ohms versions it's always better to go for higher impedance if your source can handle it.
Beyerdynamic DT150 DT250 and all classic studio and audiophile Beyers need a lot of output voltages to achieve best performance, especially highest impedance.
12Vpp is minimum and best will be 24Vpp

 

[raabje]

@raabje Zishan DSDs will drive any headphones up to 300 Ohms and better go for hi-impedance 80+ headphones for best performance.
If You have same model of headphones but different Ohms versions it's always better to go for higher impedance if your source can handle it.
Beyerdynamic DT150 DT250 and all classic studio and audiophile Beyers need a lot of output voltages to achieve best performance, especially highest impedance.
12Vpp is minimum and best will be 24Vpp

I have ordered the DT 250 - 250 ohm. I narrowed my choice between AKG 371 and the DT 250 80 and 250 ohm. Difficult choice, neither are perfect.

The DT have the imbalance problem, heavy curly wire, high clamping force, and higher cost. The 371 has a weak construction, ears get warm, and only 32 ohm so (on paper) not the best match for the Zishan DAP's.

I am looking forward to it. Since I have a HD560S I can´t stand my AKG 271mk2 and Grado SR80 anymore, they sound weak and without proper bass. I need a good closed headphone for listening when there are others in the house.

edit: just received the DT 250-250. The DSD has no problem at all driving this 250 ohm headphone. Moderate volume is the same as the 120 ohm HD560S, position 46-50.

I put in the screw to lock the connector, and also an felt ring on top of the connector for better sealing, just to make sure there is no imbalance problem. I don't hear it yet, so that is a good sign. Sound is good with the DSD. The fun of a closed headphone is a bigger impact of the music with the same volume.

 

[SnooDucksAudio]

@londere

I don't have the ak4499 model, so this can the wrong, but based on what I see in the randomly googled photo I attached, I think this ak4499 model opamps voltage is +-7V.

The ak4497 that I have has the same resistors positions in that MP1542 circuit, so I assume the two resistors that setup the MP1542 voltage to be in the same position, but if you want to be sure, you need to read the MP1542 datasheet and trace in your PCB to see if the resistors I marked red are the R1 and R2 in the datasheet circuit.

I marked in RED the 2 resistors that (I think) sets the voltage for the MP1542 boost convertor:
R1 = SMD resistor marked 224 = 220K
R2 = SMD resistor marked 473 = 47K
Vout = 1.25 × (1 + R1/R2) = 1.25x(1+220/47) = 7.10V

I'm thinking to put ELNA Silmic II on this board. At which section should I add the CAPs for the DAC itself and which part on each I/V opamp. Space isn't of concern, I'm splitting the board into two cases. I'm thinking of 16V for I/V (AD8620), 5V for the DAC, 16V for the LPF (OPA1622,1656)?

 

[SnooDucksAudio]

I do not know where to attach for the DAC, I believe the AK4499 has a MAX Voltage of 5V? Maybe WIMA will do?

 

[Merlin-PT]

@SnooDucksAudio

Good idea to separate ak4499 into 2 cases.
When you say no space concerns, you are speaking portable cases or desktop cases ?
Usually Elna silmic II is used in the signal path and they sound good there, but I never tried them in power supply.

When we select the voltage rating of a capacitor, we leave some safety room for it's operation, also not all capacitors types are equal, some you need to read the datasheet for it's specs and operation recommendations.

Do you have a multimeter?
You could identify the voltage and polarity of those capacitors places you marked in red.
From their place, they look like _local_ power reserve for the opamps.

I don't have zishan ak4499, so I can't say what connects to what (I can't see the PCB traces).
I can guess from components places, but it's much better that someone else with that model helps you.
So let's wait for others that have the ak4499 to reply and help with specific information related to that model.

 

[SnooDucksAudio]

I'm thinking two use a 2nd Zishan case. The player on one side, the other is the DAC. So there is huge amount of space for Caps.

 

[Merlin-PT]

It was a joke, there are really huge capacitors.

 

[SnooDucksAudio]

It was a joke, there are really huge capacitors.

I just got 8 whopping pieces ELNA Silmic II 50V 470UF, they are huge. No way to fit in Zishan. I'm now wondering where to use them on. I've got no desktop dacs or amps or anything.

 

[Setmagic]

Elena is good for audio path, usually for high end power supply best is MUSES KZ (best possibile series of Nichicon) for Zishan will fit FW/KW. Up to 16V 470uF in one place, and 220 (4 spaces) for 100uF 16V (8 places)

 

[SnooDucksAudio]

Elena is good for audio path, usually for high end power supply best is MUSES KZ (best possibile series of Nichicon) for Zishan will fit FW/KW. Up to 16V 470uF in one place, and 220 (4 spaces) for 100uF 16V (8 places)

I've tried Nichicon MUSE ES (old ones) on Cayin N3 to the DAC. They made the N3 less warm.

I'm thinking of 8* 10V 220/470uF for the I/V in DSDs 4499 Pro. I don't think AD8620AR can handle too much voltage?

 

[SnooDucksAudio]

I've tried Nichicon MUSE ES (old ones) on Cayin N3 to the DAC. They made the N3 less warm.

I'm thinking of 8* 10V 220/470uF for the I/V in DSDs 4499 Pro. I don't think AD8620AR can handle too much voltage?

And then 2* 470uF 16V for LPF, as OPA1622/1656 has max voltage to 38V, or is that risking it.