Xmos and AK4399 in single board

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#82
vulejov said:
If you made ​​buffer you'll need a power supply of analogue section ..

If you want to try a direct output from AK just remove opamps, 8k2 replace with 1k, 560p with 1n, out of there take the signal from PCB over 2u coupling capacitor..

It will be more than enough to push the preamp impedance of 100k.. you can put buffer later on that line..
Click to expand...

You think 1uF would be sufficent with input impedance of 1M? I remembered wrong, it wasn't 100K.
I have only 1uF home at the moment. I'm gonna test this mod tomorrow i think. Sorry for the wait... 😉
 
#83
I think the DAC is great, but needs some work:
1. The on-board regulators are plain-vanilla LM-317 - I usually take them out and install Super-Regs of various sorts (mostly the ALW-SR regs).
2. Replace the op-amps with Audio-GD "Moon" discrete op-amps, they are outstanding and sweet sounding.
3. The output filter has its -3dB point at about 80KHz. Change R4 and R5 to something like 8.2KOhms, will yield -3dB point at about 42KHz. This means less digital junk gets out the door, and the sound becomes smoother.
4. The DAC clock signal is derived from on-board oscillators, which are then powered by the same LDO regulator that drives many other chips on board. Which means the clock signal is far from ideal. I usually replace that with the clock modules from Audio-GD, using an RF coax cable to drive the clock signal. This has never failed me until now !

Cheers, Yair
 
#84
I tried the ada4627 with more than excellent result in this dac, have you Yairf tried these opamp? These are very reactive and the sound is smooth but live in same way, very different from opa627 or ne5534 for example, to me the ada4627 is an outstanding opamp in the weiliang ak4399 dac.

Inviato dal mio SM-N9005 utilizzando Tapatalk
 
#90
Ok, I've tried this and yes it sounds better. Little like changing a "low quality" cap to a real boutiqe cap ala RIKE or Audyn True copper.

Smoother and overall everything is better. I like it but gain is lower. What was 8 o'clock before is about 9-9.30 now.

Now i suddenly have a huge "bump-bump" (pretty loud, mostly in bass) when i switch song.. what is that?


I read someone else had this too, can't remember which thread though.
 
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#94
Yes both opamps removed. I cut traces after 8.2k (+ and -) total 4pcs and then soldered 1k before the 8.2k to outside my case ( no space inside for caps) the 1n is grounded to same ground as rca-

2x15v is connected but since opamps are not there no power is needed right? I mean power is cut off..

The other 2x 2x9v is there. One for clock and other for ak4399 chip.

Is it needed to have a leakresistor on output like 100k-1M like in my preamp?
 
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#96
Yes ok will try that. I've been listening alot today n except the "bumps" there is only positive things to say. Micro, macrodynamic is fantastic. Bass is scary. Very good punch and depth n drive.
There's a certain ease and flow that's quite nice. Soundstage is wider, deeper and higher.

First i thought sound became darker but it was mostly because some digital hardness dissapeard in mid/tw range.
 
#98
There is no cap in my preamp although a 1uF on output..only a grid-stopper and a 1M leakresistor on input.

I have to try to remove my 2x15v pt after weekend... Busy with other stuff

Also planning to remove all other stuff, caps, regulators "clean up" and cut of the pcb after the ak4399 chip. Why have alot of components that aren't any use for 🙂
 
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#100
I made a simple pic showing how i connected it.
 

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