[musicheaven]

It's there and they do provide the components for the output stage but not for the Input analog source, it is however on the schematics but very fuzzy and can't really tell what it is.

 

[AmberOzL]

It's there and they do provide the components for the output stage but not for the Input analog source, it is however on the schematics but very fuzzy and can't really tell what it is.

Shoot them an email, I am sure they will answer your question. Told them the schematics they published are not really clear and you would like to see the design better before you order.

 

[musicheaven]

   
Yes, you're right, there was:
 
http://www.head-fi.org/t/697035/ibasso-dx90-dual-sabre-es9018k2m-dacs-new-amp-section-latest-specifications-1st-page/1095#post_10353529
 

Spoiler: Warning: Spoiler!

but unfortunately, it's not very clear
 

 
 
 
 
 
....OK... I just visited MiniAudio's website and their schematic is clearer, but I've edited it again, to minimise degradation by the Head-fi forum software:
 

 
So, as you can see, it appears to be a TI (Burr-Brown) OPA1611
 

 
 

---

 
Thanks looks like you got it. Unfortunately it is not even in the list of recommended op-amps. I guess the AD797 would have been too expensive for them. The characteristics of the OPA611 is not bad nonetheless.

 

[jamato8]

The 1611 is very good but I like to mix opamps, if they are correct for the application, rather than using too many of the same one. The one constant is change. 

 

[HiFlight]

IMHO, the choice of the OPA1611 is an excellent choice as the audio specifications are the equal of any currently available for uncolored sound.

 

[jamato8]

IMHO, the choice of the OPA1611 is an excellent choice as the audio specifications are the equal of any currently available for uncolored sound.

Yes, I like it as much and it is more neutral when compared to the opa627. But I still prefer to not use too many of the same op amp in a circuit if there are a number of op amps to be used. The same for me, goes when using tubes and caps. I like to mix and match. The proof of course, is in the hearing. 

 

[Mython]

  .... I still prefer to not use too many of the same op amp in a circuit if there are a number of op amps to be used. The same for me, goes when using tubes and caps. I like to mix and match.

 
 
Just out of casual curiosity, what is your logic for favouring a variety of different components?

 

[monkeyboylee]

hi all, ibasso kindly emailed me back saying they expect to have it available to buy 7th april, obviously wish it could be now but at least theres a date to get excited for. my birthday is 7th april too so ill take that as an omen

 

[jamato8]

   
 
Just out of casual curiosity, what is your logic for favouring a variety of different components?

What I have experienced is that you get a better synergism than using just one constant. The electrical properties are handled differently by each op amp and when tuned correctly, I have found that this gives a more musical sound, most of the time. I am not saying you can't have all the same component but like in tubes, there are better ones for voltage, current and as a buffer and then there are different gains to affect the musical signal and you adjust for each component to get the most out of that. I tend to like the opa627 and HA5002 as the 5002 isn't quite as warm as the bu634 and I find the 627 a warmer sounding op amp so you offset and balanced the sound. Also, as you know, the operating points of each chip can be optimized. I used to run my RCA 76 tubes at max bias, they didn't last as long but they had the best dynamics and transparency. Other tubes like the mesh plate 27 Sylvania work fine a little above a mid bias, which is good as I only have about 5 pairs of NOS 1931 Sylvania 27 meshies left and they are hard to find now. 

 

[philiptw]

  hi all, ibasso kindly emailed me back saying they expect to have it available to buy 7th april, obviously wish it could be now but at least theres a date to get excited for. my birthday is 7th april too so ill take that as an omen

damn, thats 2 weeks to go..

 

[musicheaven]

Well this looks like a moving target. I remember being told it was going to be first week of March, now April. It's getting close to other vendors released products which can make you choice a lot easier as opposed to buying everything.

 

[jamato8]

Few products have I seen that do not often require more time. It would be better than getting an email to send something back for an update, or a version II in 6 months like iRiver did with the AK100, which really pissed some people off as iRiver would not compensate the people who had already purchased the AK100. 

 

[musicheaven]

Right now it's one of those two or maybe both?
 

 
 

 

[Mython]

DELETE

 

[burtomr]

   
 
Or one of these

:
 

 
Oh....you must mean the un-edible version: