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AK4499EQ - Best DAC ever
AK4499EQ - Best DAC ever
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Old 3rd September 2019, 07:04 AM   #21
xx3stksm is offline xx3stksm  Japan
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AK4499EQ - Best DAC ever
AK4499 is now working on an experimental level. He isn't an engineer but has another project about SARADC(LTC2380-24).
http://innocent-key.com/wordpress/?page_id=12726
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Old 3rd September 2019, 07:15 AM   #22
xx3stksm is offline xx3stksm  Japan
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AK4499EQ - Best DAC ever
The most surprising about AK4499 for me is the delivery time. AK has succeeded to be in time(May 2019). Even an ordinary user can buy the chip now. The six-month delay is usual in the silicon industry.
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Old 3rd September 2019, 02:07 PM   #23
diyralf is offline diyralf
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$83! Not bad.
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Old 23rd September 2019, 01:37 PM   #24
terry22 is offline terry22
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Ak4499 dac:
Новый Hxmelody (Wilmer Workshop) AK4499 DAC 2019 купить в Москве на Avito — Объявления на сайте Авито

and japanese ak4499 double mono dac card:
AK4499DM DAC基板

What do you think?
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Old 23rd September 2019, 03:53 PM   #25
Markw4 is offline Markw4  United States
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Quote:
Originally Posted by terry22 View Post

What do you think?
I would suggest to wait for some user reviews comparing them to well-known good dacs to give some idea of how the new dacs sound. How they look says little or nothing about sound quality. Even if they were found to measure very well that would not tell the whole story about how they sound.
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Old 23rd September 2019, 05:09 PM   #26
terry22 is offline terry22
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Quote:
Originally Posted by Markw4 View Post
I would suggest to wait for some user reviews comparing them to well-known good dacs to give some idea of how the new dacs sound. How they look says little or nothing about sound quality. Even if they were found to measure very well that would not tell the whole story about how they sound.
Hi Mark, thank you for your answer.
Donít worry, I wasnít about to try to buy one of these.😄
I just found them yesterday night and wanted to share, cause I think they are some of the first Dac using that chip.( except the mobile one)
I thought that someone could tell if they are good or bad implementations after seeing the pictures and translating the info.

Did you made progress with the ak4499 dev board?
Itís very exiting but you didnít post about it for a while.
Regards,
Terry
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Old 23rd September 2019, 05:56 PM   #27
Markw4 is offline Markw4  United States
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Originally Posted by terry22 View Post

Did you made progress with the ak4499 dev board?
It’s very exiting but you didn’t post about it for a while.
Yes, some progress. Working on finding out how it works with different types of voltage regulators. They do affect the sound, especially so for the +15v input power for the Jung regulators. I am going to stiffen up the feedback gain of that particular shunt regulator to see what it does to/for the sound. I also disconnected the default +-15v for the I/V stages and made it so I could run those on a separate regulator. Don't know why AKM didn't make that easier to do. With the different power loads on separate regulators (much like I did with Sabre) its possible reduce distortion and better find out where problem areas are.

Also, experiments with different cables between the eval board outputs (which are passively filtered) and the headphone amp balanced input strongly suggest some low level RF is still making its way out of the eval board. That is also a problem that has been seen with various implementations of Sabre dacs. Chord mentions it as a problem in one of their youtube live presentations too. Anyway, its something I need to deal with since it can affect the sound quality of a differential summing stage.

We tried a number of different clock sources and settled on a USB board that sounds like it produces the lowest jitter. However, I want to try that USB board with some external Accusilicon clocks.

Bass distortion was reduced early on, but the basic AKM Reference Voltage scheme has been retained so far. It can sound quite good now, but the goal is to see if we can find more ways to get further improvements in sound quality. Measurements are important too of course, but they don't correlate exactly with how people hear, so we need to do a lot of trial and error listening experiments. It is expected to take time, but its interesting and hopefully we will learn some useful things along the way.

Last edited by Markw4; 23rd September 2019 at 06:00 PM.
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Old 24th September 2019, 02:08 AM   #28
Terry Demol is offline Terry Demol  Australia
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Quote:
Originally Posted by terry22 View Post
Top one (Wilmer workshop) is using BB OPA2604 opamps for I-V.

IME, (this is my direct experience not something I've read on the internet) is
that the 2604 is a fairly colored opamp and definitely clouds some nformation
in the process of sounding 'sort of nice'. Biasing into class A definitely helps
a lot but ultimately there are better suited opamps for I-V, especially the
AK4499 which has serious OP current swing. It's not the best measuring
opamp either.

If they chose the 2604 based on listening tests then IME something else
must be slightly amiss.


T
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Old 24th September 2019, 02:43 AM   #29
Terry Demol is offline Terry Demol  Australia
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Quote:
Originally Posted by terry22 View Post
OK, just briefly checked out the second one (yanasoft.) and translated the
pdf.

IME this designer(s), has historically done some extremely high level and
interesting audio projects. Very switched on designer.

I can already see some thing's that have been addressed, it's potentially
a good board but it's also expensive and you would be foolish to go into a
project like this without at least a 100MHz cro, decent electronics knowledge
and probably a bit ore info from the designer WRT some of the choices that
were made.

My 2 cents


T
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Old 24th September 2019, 02:48 AM   #30
gabdx is offline gabdx  Canada
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who cares about specs, each dac chip has its own sound coloration.

They have strong and weak points. And the tda1541 is still a favorite despite the specifications, it has liquidity, flow, easy to grasp sound and voice that few(or none) dac can balance this well.
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