Dual mono AK4495S with AK4137 and MCU/LCD DAC kit for $160

[xcj999]

Most DACs use a dedicated clock to swap back and forth between left and right channels coming in on I2S (16/24 bits then swap, repeat), if your device isn't outputting in the properly structured format, you might get a result similar to what you're seeing.

ok, thanks for the reply. will contact the waveio designer and see what he says.

 

[xcj999]

*lol* figured out my problem, it was a wrong jumper setting ;-)

 

[MBA]

...figured out my problem, it was a wrong jumper setting ;-)

Is your DAC running incl. remote, XCJ999? How is your experience up to now?

 

[Neslo]

I have build the Dual AK4495 and AK4137...however together with my NewClassD NCDV then there are digital interference so music comes and goes (dropouts and mutes in channels). it is not constanst but happens randomly. I have tried to replace the AK4137 with TwistedPearAudio 4:1 SPDIF MUX but same issue.
NCDV works fine with other analogue input and with TwistedPearAudio MUX, OPUS and IVY combination.
When there is no dropouts then it plays fine and much better than OPUS/IVY combi...
My guess it is some sync issue (MCLK is connect both from AK4138 and MUX) but can't find the issue..J04 and J07 was closed for the MUX not difference on J10,11 on or off.

Any hints to what it can be and how to fix it?

 

[MBA]

I have build the Dual AK4495 and AK4137...however together with my NewClassD NCDV then there are digital interference so music comes and goes (dropouts and mutes in channels)... NCDV works fine with other analogue input and with TwistedPearAudio MUX, OPUS and IVY combination....
Any hints to what it can be and how to fix it?

Have you tried the DAC with another amp? Is it the DAC itself or in the combination with NCDV only?

 

[Neslo]

Have you tried the DAC with another amp? Is it the DAC itself or in the combination with NCDV only?

I don't have another amp at the moment to try it out...but NCDV D-class amp does not make any noise or dropouts when connected to other equipment

 

[Tomax]

Anyone knows where to buy the Dual mono AK4495S board because it isn't available at Aliexpress anymore?

Bye
Tom

 

[ozcal]

Anyone knows where to buy the Dual mono AK4495S board because it isn't available at Aliexpress anymore?

Bye
Tom

https://www.aliexpress.com/item/DUA...lgo_pvid=ca98f0bf-1936-4747-829e-aeeeca15f40b

 

[kukynas]

here's complete functional DAC in chassis if anybody interested, $160 + cost of USB module, shipping and import taxes, excellent bargain if one consider cost of all components presented in this thread and work required to put it together 🙂

 

[ozcal]

here's complete functional DAC in chassis if anybody interested, $160 + cost of USB module, shipping and import taxes, excellent bargain if one consider cost of all components presented in this thread and work required to put it together 🙂

Now , that's a bargain even if one has to swap out the transformers for 230 v instead of the supplied 220v ones. In Western Australia I get 248v at the outlet so we have to be careful.
Saw the same thing on Aliexpress for a lot more.
Daniel any idea when the designer will release a dual 4497 board for diy?

 

[kukynas]

I don't think he will release AK4497 or at least not soon, haven't heard from him for some time but I know he is working on full DAC version with ES9028 as shown here...

 

[ozcal]

I don't think he will release AK4497 or at least not soon, haven't heard from him for some time but I know he is working on full DAC version with ES9028 as shown here...

Thanks Daniel.

 

[felipeunix]

Is the load resistance information referring to the diagram?

 

[fluid]

In case anyone is interested I ran some measurements with different filter settings on my Dual AK4495 DAC connected via USB with the input board from the same manufacturer. They are recorded into a Focusrite 18i20 interface so there will be some influence from that device in the impulse responses but the frequency and phase have been calibrated as can be seen from the straight line from the Scarlett trace.

I have included the traces from an ES9018 for comparison.

As you can see they vary quite a lot. The sharp roll and super slow seem to be the cleanest.

The impulse responses can be seen in this post here

http://www.diyaudio.com/forums/full-range/303417-full-range-tc9-line-array-cnc-cabinet-49.html#post5091167

 

[vulejov]

As you can see they vary quite a lot. The sharp roll and super slow seem to be the cleanest..

Please, explain a little bit detailed..

 

[fluid]

Please, explain a little bit detailed..

If you look at the impulses in the other thread I linked you can see the level of pre and post ringing in the impulse response from the filter used in the DAC. The Sharp and Super slow have the least overall ringing.

The sharp filters have no high frequency roll off in the frequency response, but the slow roll off filters do. Whether any of that matters maybe depends on your point of view, but I was a little surprised by how early the slow roll off filters started.

The phase graph shows where and how the filter affects the phase at high frequencies.

The colours in the graph represent the filters listed in the legend below and the traces have been separated to make it easier to see the responses.

So apart from the effects of the different filters the frequency response is really very good.

 

[vulejov]

The Sharp and Super slow have the least overall ringing..

So, you claim that two theoretically worst filters are the best..

 

[fluid]

So, you claim that two theoretically worst filters are the best..

I made no claims, I said they have the least overall ringing which they do. What is the best is a more subjective discussion.

I posted the data without much of a description so others can make their own mind up, you were the one who asked for more description so I gave it.

It was more a verification that the different filters do have an effect and I showed how they measure in frequency, phase and impulse.

What do you consider to be theoretically the best filter and why?
Does that match with your preference when listening to them?

 

[vulejov]

I posted the data without much of a description so others can make their own mind up, you were the one who asked for more description so I gave it.

In yours data best impulse response have slow and sharp roll..

 

[vulejov]

What do you consider to be theoretically the best filter and why?
Does that match with your preference when listening to them?

I use JLSounds AK4490..
I can't decide between sharp and slow short delayed..