[Ivan TT]

Is there a post here, or a link, to the changes you made to the HPF?

I don't think so.

If the original Zishan circuit is from the AK4490 data sheet, are your changes just substituting a different op-amp or are you changing other filter components?

Changing op-amp and other components (MKT caps 1nf, just to see if it makes any difference, most likely not), having said that currently I have NO LPF opamp at all.
"Null" LPF opamp has the following advantages: does not overheat (or consume any power at all), cheap, does not colour the sound.

 

[Ivan TT]

I wish you are just 1 hour driving so I could visit and get my Z2 those 2 green arms of HULK lol... Anyway looking so fully packed, how was the sound difference after the mod?

Buy all means to pop by if you find yourself down under.
I don't remember the original sound signature, to be honest (although I have another Z2 on it's way, so will be able to compare), but I am VERY satisfied with the sound ATM.
Most important components are: V6, buffers/balanced drivers in F1, CH9T IEMs, AD712JN op-amps in F1, Nichicons output caps x2.

 

[Muzamil]

Ok..I took the plunge

 

[chaotic_angel]

Can you close the casing?

Yes, perfectly!

 

[MLTKSHHBT]

Do I need a single or dual one if I want to swap the stock opamp to opa627?

 

[knudsen]

Do I need a single or dual one if I want to swap the stock opamp to opa627?

A dual one, I bought one like this. I don't know why all the sellers have agreed to call it "dual to mono", they're the opposite. On the linked one there is a mono ic on top and one on the bottom. Dual just means stereo

 

[MLTKSHHBT]

A dual one, I bought one like this. I don't know why all the sellers have agreed to call it "dual to mono", they're the opposite. On the linked one there is a mono ic on top and one on the bottom. Dual just means stereo

Thanks!
How does opa627 sound compared with the stock one on z2?
Have you tried lme49720ha, and which is better?

 

[knudsen]

I like 49720ha best of all, but I may be in minority. I find opa627 quite warm, I think it is best for controlling a bit too much brightness/too lean sound. I also find 49720ha better than muses02 and v5i, but maybe I haven't given those enough time (I've tried several times, and each time missed the HA)

 

[noknok23]

let it go for a couple of days when replacing op amp maybe :^)

 

[tamio]

Hi
Could we use WASAPI + foobar for Zishan Z2? :-? I can only use ASIO4ALL + foobar...

Still confuse about how to get bit-perfect playback

 

[LaughMoreDaily]

I like 49720ha best of all, but I may be in minority. I find opa627 quite warm, I think it is best for controlling a bit too much brightness/too lean sound. I also find 49720ha better than muses02 and v5i, but maybe I haven't given those enough time (I've tried several times, and each time missed the HA)

I just installed the 49720HA in the Z1, yours is in the Z2?

 

[LaughMoreDaily]

So I would rather choose Burson V5i instead of LME49720HA and V6 vivid instead of MUSES02, or would look at stacking opamps to give MUSES02 more articulated lows and highs.

What's the V6 Vivid? Do you have a link to buy?

 

[Ivan TT]

What's the V6 Vivid? Do you have a link to buy?

Discrete op-amp from Burson Audio.
Link and more info:
https://www.bursonaudio.com/products/supreme-sound-opamp-v6/

 

[DBaldock9]

I don't think so.

Changing op-amp and other components (MKT caps 1nf, just to see if it makes any difference, most likely not), having said that currently I have NO LPF opamp at all.
"Null" LPF opamp has the following advantages: does not overheat (or consume any power at all), cheap, does not colour the sound.

From my understanding of Digital Music conversion to Analog, you're dealing with converting a stream of discrete voltages to a smooth analog signal - i.e. for a CD, that's changing the 1.4 Million Bits per second data stream, into an analog wave.
Since the data stream is square wave pulses, and a square wave has a large number of higher frequency harmonics, wouldn't you need a good Low Pass Filter operating, to remove the harmonics when converting from the digital representation to the smoothed analog signal?

 

[Ivan TT]

From my understanding of Digital Music conversion to Analog, you're dealing with converting a stream of discrete voltages to a smooth analog signal - i.e. for a CD, that's changing the 1.4 Million Bits per second data stream, into an analog wave.
Since the data stream is square wave pulses, and a square wave has a large number of higher frequency harmonics, wouldn't you need a good Low Pass Filter operating, to remove the harmonics when converting from the digital representation to the smoothed analog signal?

Absolutely!
Having said that, AK4490 has built-in filters, so the analog one is only contributing to filtering, not doing it on and by itself. Also, all the caps and resistors are (mostly) in place, so I have a passive filter (instead of an active one that utilises OP amp).