ebay:Weiliang Dual X2 AK4399 DAC with LCD

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#161
Hi Dave,
Agree with your comments, this DAC for me too is the best so far.

My previous DAC was a Behringer SCR2496 too, very modified finally, with separate output stage (the same I'm using still). I found out that the ASRC of the receiver wasn't that good, it was just transferring jitter from a timing problem to an amplitude problem, which is discussed on this board also.

Original clock sounded better in my setup though. After modifying (separating) analog psu of the CS8420 of the behringer, sound improved a lot and there wasn't anymore that much difference between original and upsampled SQ.

This new 2xAK4499 board has a better receiver, without upsampling, but you really don't need it, imho. I have already done the same trick: giving the analog pin of the chip it's own (very low noise) psu. Result is very good. I'll post some pictures later.
 
#162
kukynas said:
we are in 2014 right? or shall I return my DAC because it's lying to me? 😉

An externally hosted image should be here but it was not working when we last tested it.

images upload

do you have link for that thread please? I can't find it, or I'm blind 🙁 , thank you


.
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I have run 192k thru toslink. you need the right transmitter and receiver opto blocks (not very common, 25mhz I think is one of the part grades) but it DOES work in those cases.

btw, that breeze audio box is funny. 'compress' ? what the hell is that all about? does this convert audio to mp3's or something? (LOL!)

cracks me up. before putting words on a box that you don't understand, MAYBE the seller can have an english speaker proof read things before he looks like a fool? nah, that would be too easy.
 
#163
vulejov said:
This XMOS board do not have DSD support.. DAC7 do not have DSD support.. you did not understood something..

Chinese sellers just play this game.. as long as everyone write what they can not understand or do not know, they will continue to have a good advertisement for their junk..

On the other hand, situation is nothing better with comercial devices, I think it's a lot worse..
Click to expand...

A guy who own this board says here that it plays DSD. Anyway I will know truth and report it in 3 weeks time because I already ordered it.
 
#164
re. toslink, if I understood well it's more about max bit rate of the transmitter and receiver, standard one is 16Mbps = to 96khz, 25Mbps = to 192khz

yeah I know, box has funny name 😀 but I took it because it nicely fitted my board with backplate and LCD so I didn't have to drill too many holes 🙄
 
#166
vulejov said:
The most important thing is not mentioned..
The settings in Foobar are set up to convert DSD-PCM..

Also are mentioned some problems with XMOS chip.. another low designed Chinese toy..
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Hi Vulejov,
Did you mean that in order to play DSD files with that XMOS USB card it is necessary to set up DSD->PCM conversion in Foobar2000? I am asking for that because here different settings are described. Thanks for an answer in advance.
 
#168
Valeri100 said:
Hi Vulejov,
Did you mean that in order to play DSD files with that XMOS USB card it is necessary to set up DSD->PCM conversion in Foobar2000?
Click to expand...

There are several versions of XMOS chip..
Also, there are many ways how to flash it, depending of the use.. it's not so simple..
If you have time, read it Multicore Microcontrollers | XMOS

Nosian said:
THIS one came to the world! i2s choose your own input board!
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Same story here..
There are several ways to input I2S signal in AK4396 or AK4399.. only one way allows PCM and DSD playback, others only PCM..
Until now, not a single Chinese board support DSD and PCM playback..
If you have time, read it, page 6 first.. http://www.akm.com/akm/en/file/datasheet/AK4399EQ.pdf
 
#169
kukynas said:
vulejov: I've asked same question on previous page, what is than better? what is so good you won't call it Chinese or other junk? of course in similar price league, have you ever seen Chinese diy forum? do you know what these guys are capable of or will you just stick to ebay sellers and put all Chinese into same bag. Until someone show me better sounding DAC able to receive 24/192 through toslink in same or similar price I won't accept these are junk products, not perfect or high-end but for such money I won't complain
It's always easier saying how bad it is but much harder how to fix or improve it...

Dave: I didn't bother with USB card as I wouldn't use it, rather use network or USB/HDD player with optical out which you can use instead of PC, of course there is nothing wrong with USB transport from PC just not so much practical especially if you have your stereo elsewhere
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Thanks Kuynas I was thinking if buying a second hand squeezebox touch from eBay they can do 24/192.
 
#171
Dave murrey said:
That's interesting I would be up for trying a AK4490 dac.
It would be nice if it upscaled the incoming signal as well like the behringer src2496 did.
It used a AK4396 CS8420 upscaling chip it upscaled my digital input signal up to 96/24 bit.
Saying that the Dac I've got now still sounds better but I can only imagine how it would sound with up scaling because it made a huge difference to the behringer.
Click to expand...

I don't understand the figures but they also list a AK4495.
 
#173
Thank you Veleri I will consider this but I have not got my own computer I use my sons computer or a iPad.
I was thinking of a squeezebox and a hard drive to save music onto.
Then I can use my iPad with squeezebox.
I much prefer my dac with the tubed output.
 
#174
Established OP01 so far this is the best sound.
½ÜÃ÷OP01¶¥¼¶µ¥ÔË·ÅÄ£¿é£¬³¬OPA627½ð·â¡¢AD797¡¢NE5534-ÌÔ±¦Íø IMG_0572.jpg
 
#178
Output stage for all devices with AK4396/99 looks like this, values are maybe different, but schematic is same..
The biggest problem there is 680p feedback resistor, because it significantly slows opamp.. there is no logic that you can hear differences between two opamps, as long as circuit is like this.. same story about replacing of capacitors..
 

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#180
kukynas said:
vulejov: I can tell you for sure you'll here the differences with changing opas on this board but it is not significant like night and day, minor change of characteristic...
here is schematic of our board AOUT, any suggestions? thank you

An externally hosted image should be here but it was not working when we last tested it.

click image upload
Click to expand...

Hi Kukynas I also noticed a difference by changing the cap after LT085-3 from 47uf to 2x Sony oscon sepc 100uf caps.
This was a mod suggested to me by Ninosimon 1st June.
To be honest I couldn't notice much difference on op output but it is slightly clearer on tube output.
My tubes take signal from the 12k resistors after the AK4399.
 
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