[ninko]

IMO the wrost errors/mistakes in firmware control for Z2
1. Gap between 2 tracks is too short. Nearly zero.
2. The beginning of new track lost 0.5-1s music when Z2 is used as Dac (on Andoird OTG or PC), it is not effected by music player software on phone or windows but firmware on Z2 delayed on processing or so on... I don't know.

 

[jipkai123]

Hello guys, just got my zishan z2 from the mail today. is it better for me to get LME49720HA to change the opamp of z2 or just get an external portable amp like fiio e11 with output impedence near zero for cheap secondhand? I suspect that the 100ohm output impedence may be causing damping issues with my ath-im01 balance armature.

 

[Eririn07]

Hello I owns Z2 for almost 2 weeks now. and now i think its time to upgrade it

the question is:
1. Is changing the OP275G with replaceable opamp (like burson/muses) worth it? without adding a resistors or changing the cap
2. what is the best combination of capacitor that makes this little thing sounds better?

thank you

 

[Stevensteady]

Hi all, do I need to delete my songs in memory card during the update?

 

[theoutsider]

anyone tried AMP9980SQ/883 on a Z2? it is said to be better than
LME49720HA and MUSES02


https://item.taobao.com/item.htm?sp...389&pvid=f936455c-7fe5-490a-976f-84c3f683f48b

 

[Merlin-PT]

Ordered 0.1uF and smaller 220uF caps, i can confirm that sound changes indeed, for better or for worse - purely subjective and depends on the taste, of course.
Actually, based on datasheet only two caps should be changed to 220uF, will fix it when caps arrive.
Z2 is a wonderful platform for experimentation, that's for sure.

I randomly found this:
https://hifiduino.wordpress.com/2014/12/07/akm-verita-4490-dac/

"VREFH-L/R and VREFL-L/R should be connected with a 0.1µF ceramic capacitor as near as possible to the pin to eliminate the effects of high frequency noise…"

"In addition, according to the eval board manual, a large value capacitor between VREFH-L/R (Analog 5v) and VREFL-L/R (GND) improves the THD performance in accordance to the following graph:"

"The Diyinhk board is implemented with 2200 uF capacitors, achieving the best THD numbers. (The larger capacitor holds the reverence voltage stable -perhaps an even larger capacitor would further improve the low frequency THD numbers)."

-
I have no background in electronics, but we can see that using an higher capacitance lowers the distortion, this happens for a big frequency range.

 

[Ivan TT]

I have no background in electronics, but we can see that using an higher capacitance lowers the distortion, this happens for a big frequency range.

Neither do I, but subjective tests confirm a change in the sound that could be rationalised as lower distortion compared to stock (although another observable effect is better dynamics in LF with higher capacitance caps, which would not be happening if there is clipping present due to limiter power available from the power supply, obviously this will produce more compressed low frequency responce and generate harmonic distortion.
My mod does not have 0.1uF caps over VREF at the moment, that's next thing on my to do list, I hope for improved HF resolution (as currently cymbals lack precision and sound a bit noisy compared to mojo).

 

[Merlin-PT]

Do you know if a cap bigger than 220uF could fit there?
I'm following this thread with interest and ordered a Z2 2 days ago, but it takes some weeks to be delivered.

 

[Ivan TT]

Do you know if a cap bigger than 220uF could fit there?

Probably these, 330uF:
https://www.arrow.com/en/products/s...0uF;&sortBy=calculatedPrice&sortDirection=asc
I ordered TAJC337M006RNJ

 

[dumbears]

Do you know if a cap bigger than 220uF could fit there?
I'm following this thread with interest and ordered a Z2 2 days ago, but it takes some weeks to be delivered.

Not sure if you can buy this series from your end: Toshin Kogyo TK UTSJ. These capacitors are audio grade and bipolar. Its 6.3V 330uF is just 6.3mm diameter. You can look up for its datasheet.

 

[dumbears]

anyone tried AMP9980SQ/883 on a Z2? it is said to be better than
LME49720HA and MUSES02


https://item.taobao.com/item.htm?sp...389&pvid=f936455c-7fe5-490a-976f-84c3f683f48b

I haven't tried either of those opamps whose model # starting with "AMP". These are said to be made in US, but these only show up in China nearby region. However, if they're cheap, I myself might try them out one day, since there aren't any info in the Internet.

 

[theoutsider]

I haven't tried either of those opamps whose model # starting with "AMP". These are said to be made in US, but these only show up in China nearby region. However, if they're cheap, I myself might try them out one day, since there aren't any info in the Internet.

Don't get the AMP opamps. I talked to a TaoBao HIFI electronics merchant yesterday, he confirmed that some Chinese relabeled lesser opamps (that costs few cents) as AMPs and sell them as premium products. The company is not even real, so there's no info about the company, no spec sheets and that's why the fishy brand name. Many TaoBao and Taiwanese merchants are promoting AMPs as mysterious wunderamps.

https://tieba.baidu.com/p/4229229043?pid=81114000571&cid=0&red_tag=3590796457#81114000571

I bought LME49720HA to be safe.

 

[ninko]

The best and rite way to maximize sq of Z2 is building better power supply for this board. No battery, no switching, no boot up volts...
But for this Z2 not portable anymore.

 

[Merlin-PT]

I was wondering if 1000uF or 2200uf exists in a size that would fit the backside of Z2.
I have no idea whats the size for these capacities/voltage.
After searching, It looks like these won't fit.

Randomly googled measures:
https://content.kemet.com/datasheets/KEM_T2005_T491.pdf

1000uF/6.3V
part n.:T491X108(1)006AT
case size: X/7343-43
L=7.3mm
H=4mm
W=4.3mm

I don't have the Z2 yet, but in Z1 the maximum back Height without bending the board is <=3.5mm.
If Z2 has the same size, I think case size X/7343-43 doesn't fit.

They also have this:
470uF/6.3V
T491D477(1)006A(2)
case size: D/7343-31
L=7.3mm
H=2.8mm
W=4.3mm

Case size H=2.8mm fits, but we'll have to see if Length=7.3mm fits.

Anyway, it looks like the values that could fit are around 220uF, 330uF like you said, maybe 470uF could fit, I don't know the Length of Z2 cap.
They have several sizes for each of these capacitances, we must order the model that fits.

 

[dumbears]

I was wondering if 1000uF or 2200uf exists in a size that would fit the backside of Z2.
I have no idea whats the size for these capacities/voltage.
After searching, It looks like these won't fit.

Randomly googled measures:
https://content.kemet.com/datasheets/KEM_T2005_T491.pdf

1000uF/6.3V
part n.:T491X108(1)006AT
case size: X/7343-43
L=7.3mm
H=4mm
W=4.3mm

I don't have the Z2 yet, but in Z1 the maximum back Height without bending the board is <=3.5mm.
If Z2 has the same size, I think case size X/7343-43 doesn't fit.

They also have this:
470uF/6.3V
T491D477(1)006A(2)
case size: D/7343-31
L=7.3mm
H=2.8mm
W=4.3mm

Case size H=2.8mm fits, but we'll have to see if Length=7.3mm fits.

Anyway, it looks like the values that could fit are around 220uF, 330uF like you said, maybe 470uF could fit, I don't know the Length of Z2 cap.
They have several sizes for each of these capacitances, we must order the model that fits.

Are you trying to replace the 1000uF/25V cap? If so, you should go after those 16V caps minimum. If you're looking for caps to replace those 2 100uF caps, I don't think you need to look for capacitance with that big, 1000uF.