Opa128sm sound very good to me it would be the best sounding opamp.... but it gives me feeling of sluggishness, a bit to much relaxing sound, vocal are impressive.
Inviato dal mio SM-N9005 utilizzando Tapatalk
lomonosoff:
, I didn't like 49710 as they were too harsh with my stereo, more than 4627-1BRZ I'm using now...
keres: next time I'll consider them 😉
keres: next time I'll consider them 😉
On my DAC LME49710NA playing well and fine.Strongly reminiscent OP01 and from 4627 not want kosovali and Goodies in the sound.How to get rich buy SS3601🙂
lomonosoff:, I didn't like 49710 as they were too harsh with my stereo, more than 4627-1BRZ I'm using now...
keres: next time I'll consider them 😉
Kukinas I am wrong or you have the same amplifier as mine?
If I remember well, you have a marantz ki pearl lite.
Anyway to me the 49710ha is not harsh in my set up, my speaker are kef ls50.
Are you sure your lm49710 is original?
Inviato dal mio SM-N9005 utilizzando Tapatalk
keres: yes, I do have MA KI pearl lite paired with Focal 826W, these speakers are bit more sensitive for highs and mids so anything what is more bright will be equally reproduced, if you try i.e. VA Best audiophile voices collection (1993-2011) in hi-res you will understand what I'm talking about, and yes, my LME49710HA are original, problem is not with OPA but with DAC, it's brighter than my other DAC and every (except OPA627BP) OPA I tried was harsh in weilliang's DAC, my stereo plays well with 3in1 DAC even if I'm using AD823 OPA which is also bright but even if, it's still less bright than weiliang together with ADA4627-1BRZ, problem is DAC or it's output stage not OPA or not that much, I got dual to 2xsingle adapter on the way so once it arrives I'll try all of my single OPAs with 3in1 DAC and will report back, I'm not saying LME49710HA as OPA is harsh but whole combination with weiliang DAC makes it harsh sounding and that's why I didn't like it 😉
yep, it is softer but sometimes too soft for me 😉
in the meantime AD797AR in dual mode arrived so round #2:
2xWM8741 + 2xAD797AR vs. 2x4399 + 2xADA4627-1BRZ
music: Eva Cassidy best of
they are equal in sound performance except 3in1 DAC doesn't sound harsh and mids do not screaming on you like in case of weiliang DAC, AD797AR was not even burned in...
I know it's unfair comparison cuz AD797AR might be better chip so I'm more than happy to do 1x1 when AD797BRZ arrives, so Thursday be ready for another battle
in the meantime I just can't express how does it all sounds, especially if your whole family's gone for playground 😀
in the meantime AD797AR in dual mode arrived so round #2:
2xWM8741 + 2xAD797AR vs. 2x4399 + 2xADA4627-1BRZ
music: Eva Cassidy best of
they are equal in sound performance except 3in1 DAC doesn't sound harsh and mids do not screaming on you like in case of weiliang DAC, AD797AR was not even burned in...
I know it's unfair comparison cuz AD797AR might be better chip so I'm more than happy to do 1x1 when AD797BRZ arrives, so Thursday be ready for another battle
in the meantime I just can't express how does it all sounds, especially if your whole family's gone for playground 😀
lomonosoff: conclusion is that 3in1 DAC sounded better to me 😉
AD797BRZ arrived, bit of soldering and now burning in, hopefully 48 hours will be enough to do another comparison 🙂
AD797BRZ arrived, bit of soldering and now burning in, hopefully 48 hours will be enough to do another comparison 🙂
lomonosoff: haha, sure 🙂, to be honest I believe weiliang DAC has potential with better chip, better dynamic range, generating more details etc. but problem is that the output stage is for now more aggressive than I think it should be, my problem could be also that the speakers+amp combo doesn't match characteristic of the DAC, may be tube DAC would be better but..., either I'll be able to fix it or not and if not I will look for other DAC, simple 😉
there is still lot of testing front of me so who knows 🙂
in the meantime AD797 got 24 hours of juice, don't know what happened but when I was checking this evening they were both ready for roasting eggs, it looks like +/-15V is edge of their specs because that's what I measured yesterday on both DACs, how to describe sound, well imagine Dr. Dre with Eminem dancing gangnam style 😀 ,maybe good for RAP but definitely no pleasure for vocals, too much of everything, most probably distortion from high temperature or it should sounds like this but than no no for me 🙂
so quickly changed to LME49710HA (will give them another chance) and will see tomorrow if anything change, stay tuned 😉
there is still lot of testing front of me so who knows 🙂
in the meantime AD797 got 24 hours of juice, don't know what happened but when I was checking this evening they were both ready for roasting eggs, it looks like +/-15V is edge of their specs because that's what I measured yesterday on both DACs, how to describe sound, well imagine Dr. Dre with Eminem dancing gangnam style 😀 ,maybe good for RAP but definitely no pleasure for vocals, too much of everything, most probably distortion from high temperature or it should sounds like this but than no no for me 🙂
so quickly changed to LME49710HA (will give them another chance) and will see tomorrow if anything change, stay tuned 😉
AD797 is really fast opamp. It requires really good layout with properly situated decoupling caps. In your case, it definitely oscillated regarding their temperature.
Page.P: most probably, but it's strange because yesterday it looked fine, even the sound seems to be OK
Yesterday opened for itself a new quality audio DAC and headphones Takstar HD5500,the sound is just awesome,these headphones beat my old DY770PRO on all parameters,I am shocked.
+5V power supply improvement
Hi guys
I've done some improvements to the analog and digital psu for the AK4399 DACS.
Unfortunately the pcb isn't very good designed, I must admit finally. The regulators are not connected to the load the best way. But don't despair, I've found a simple solution!
The sound of the DAC becomes more dynamic, but not in a harsh way, the oposit: It's much more quiet, less noise, less agitation. I'm very happy with the results.
The problem is that the regulator adjustment circuit is connected to the same ground trace as the one carrying the ('dirty') current that has gone through the load. So it cannot 'sense' the right ground potential at the load, and thus it cannot regulate the voltage over the load properly. See the first picture.
The mod is to isolate the adjustment circuit from input ground, and let it's current flow via the load ground, back to the input ground.
The output capacitor value is raised to 470u/6.3V, for better stability. Just pick a big cap (no low ESR type, preferably audio grade) and decide for yourself. The capacitor in the adjustment circuit, across the resistor, is also raised to 100u/6.3V (or higher voltage rating). There's not much room for bigger, 220u would be even better I think. This cap influences noise performance.
To isolate the adjustment circuit, you have to cut 3 traces (for modding 3 regulators). Two at the front, one at the back of the PCB. Finally you must complete the circuit by connecting 4 wires from the load-decoupling capacitors ground terminals directly to the - terminal of the big psu cap (2 for analog, 2 for digital, see picture).
IMO, this mod can also be very rewarding if you're using super regulators for 5V analog and digital DAC supply. I included a picture of the circuit, it's practically the same method.
Analog output stage with the LM337/317 regulators suffers probably from the same, so can be improved the same way. To improve analog stage you can also try to mount (super)regulator very close to the load (op-amps), to have the same effect.
If you have any questions, just ask.
Regards, NinoSimona
Hi guys
I've done some improvements to the analog and digital psu for the AK4399 DACS.
Unfortunately the pcb isn't very good designed, I must admit finally. The regulators are not connected to the load the best way. But don't despair, I've found a simple solution!
The sound of the DAC becomes more dynamic, but not in a harsh way, the oposit: It's much more quiet, less noise, less agitation. I'm very happy with the results.
The problem is that the regulator adjustment circuit is connected to the same ground trace as the one carrying the ('dirty') current that has gone through the load. So it cannot 'sense' the right ground potential at the load, and thus it cannot regulate the voltage over the load properly. See the first picture.
The mod is to isolate the adjustment circuit from input ground, and let it's current flow via the load ground, back to the input ground.
The output capacitor value is raised to 470u/6.3V, for better stability. Just pick a big cap (no low ESR type, preferably audio grade) and decide for yourself. The capacitor in the adjustment circuit, across the resistor, is also raised to 100u/6.3V (or higher voltage rating). There's not much room for bigger, 220u would be even better I think. This cap influences noise performance.
To isolate the adjustment circuit, you have to cut 3 traces (for modding 3 regulators). Two at the front, one at the back of the PCB. Finally you must complete the circuit by connecting 4 wires from the load-decoupling capacitors ground terminals directly to the - terminal of the big psu cap (2 for analog, 2 for digital, see picture).
IMO, this mod can also be very rewarding if you're using super regulators for 5V analog and digital DAC supply. I included a picture of the circuit, it's practically the same method.
Analog output stage with the LM337/317 regulators suffers probably from the same, so can be improved the same way. To improve analog stage you can also try to mount (super)regulator very close to the load (op-amps), to have the same effect.
If you have any questions, just ask.
Regards, NinoSimona
Attachments
For those having the newest version PCB: please, can you check if this mod can also be done with your version?
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lomonosoff: I got Hi2050 and HD2000, both of them are great cans for different purposes but of course you can't expect it'll be at the level of something like Senn HD598
Hi Nino: I'll have a look over the weekend but if I remember well top of the PCB is the same like v.1
Hi Nino: I'll have a look over the weekend but if I remember well top of the PCB is the same like v.1
Personally my HD5500 easily beat DT770PRO.От that I am not a big Satan because they have absolutely rasnaca just makes wonders.
I'm not fun of Beyers so can't comment the difference but if you like bassy sound HD5500 isn't bad choice 😉
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