@Tysun , which one are you referring is it powerdac v2 with issue?

The Powerdac v2, makes my earbuds sing. It transforms it from a baby to a grown man. :)

@cqtek , nice fr at 83% almost flat no roll off...at 84 and above the sine wave is distorted as seen its clipping symmetrically. I think that is audible did you try with headset at that level? Also, seems it will perform better with at 100 ohm and above for max power transfer.

I don't think so... We'll see after your evaluation.. :)

@cqtek, please publish your FR findings on T1. Looks promising but seems the chassis is a reused from the failed Walnut v3. Except for the internal ckt.

@CoiL what dap are you using to experiment with those opamps? Thanks

RS Components

@Themilkman46290, that's bad.. btw, where did you previously ordered you stuff's? Try Rs or mouser.

Guys, anybody measured the actual stock output impedance/resistance of the zishan dsd? thanks

Hi @Ivan TT , on item#5, you mentioned there are four capacitors around the lpf opamps... may we know the value of these capacitors and type? thanks

@Ivan TT , sounds very convincing now..the challenge of doing the mods is one of the things that influence DIY'ers like us :) :) Thanks

Guys, just asking I want to pull the trigger on zishan dsd and I have watching thread in the past days. Curious question.. what sound signature does the zishan dsd emits when compared with other good/best sounding daps? I have zishan z1 and I just plan to upgrade.. In my z1 I only did opamp...

@Spektykles , you have a genuine AD797SQ you see they have a plant in the Philippines. For that reason it's laser printed underneath. That ceramic package is for high temp environment.

Hi @cqtek , I hope you can provide FR for X3ii it would be interesting tohow see how it actually compares to QNGEE... :) :)

@oneula which one is your favorite?

Which test parameter/s do you look into in choosing AD8672/OPA1612 as good LPF? thanks

careful removing those decoupler exposes your headphones to offset dcv it might hurt them. anyway I think ivantt did it without hassles.

Hello @oneula, soundwise how does QNGEE compare to your Faudio and Z3? ;)

Hi @oneula , what is your impression on QNGEE? :) thanks

my opa1692 and opa2209 on lbb4.

@cqtek , great review.. makes me wanna pull my trigger on QNGEE.

@cqtek , thanks for the graph I appreciate your help, no roll-off the low frequency but rolls off at high frequency which starts at 10kHz, it seems the biasing components around the lpf op amp alters the high frequency it actually starts the break off point at around 8khz. I think Z1 has better...

Hello @cqtek , that would be great. I'm excited to see your findings in the line out of Z3...

@cqtek, I am just curious you measured at the headphone out which is the amp stage. But how about measuring at the line out of each daps. Line outputs are connected directly to op amp buffers. I wonder how the results would be. :)

I dont know if it is only me but I have Sparkos SS3602, OPA2209 and OPA1692... and I have AD4084 but have not yet engage it in. OPA1692, clarity and details which translates to better highs., bass it can go deep but not basshead, width and depth is there, mids are a bit laid back but just...