New face in op amp industry

[MCH]

@jkim measured the jcally jm20 max, that supposedly uses the sgm8262 and he was impressed with the results

https://audiosciencereview.com/foru...ap-usb-c-headphone-dongles.26260/post-2271431

 

[Jean-Paul Petrosyan]

@jkim measured the jcally jm20 max, that supposedly uses the sgm8262 and he was impressed with the results

https://audiosciencereview.com/foru...ap-usb-c-headphone-dongles.26260/post-2271431

Got it, thank you!

 

[jkim]

@jkim measured the jcally jm20 max, that supposedly uses the sgm8262 and he was impressed with the results

https://audiosciencereview.com/foru...ap-usb-c-headphone-dongles.26260/post-2271431

Based on the SGM8262 datasheet, it seems that it was specifically designed for high output current applications. It should beat the SGM8261 or the RT6863---the two chips discussed in this thread---in regard to max output capability. There should be reason why a bunch of recent Fiio products are using the SGM8262. Most likely nice performance for its cost vs. TI or AD chips...

 

[Jean-Paul Petrosyan]

Based on the SGM8262 datasheet, it seems that it was specifically designed for high output current applications. It should beat the SGM8261 or the RT6863---the two chips discussed in this thread---in regard to max output capability. There should be reason why a bunch of recent Fiio products are using the SGM8262. Most likely nice performance for its cost vs. TI or AD chips...

Hope there weren't too much compromises made for the sake of that high output capability... Chasing raw power is a silly trend, imo, for portable devices at least. It'll be redundant in 95% of use cases, I think.

Though I might be wrong...

 

[jkim]

Hope there weren't too much compromises made for the sake of that high output capability... Chasing raw power is a silly trend, imo, for portable devices at least. It'll be redundant in 95% of use cases, I think.

Though I might be wrong...

It is all about use cases. If one uses only highly efficient IEMs and headphones, then high output capability is wasted. And as you know, high gain / current is simply unfavorable to headphone amps---i.e., it is much easier to design a transparent headphone amp stage if the demand is low.

In my case, the only reason why I would prefer a powerful USB dongle is because I want to use some relatively inefficient headphones connected to my laptop and don't want to also carry a heavy DAC/amp. Since I use it with a laptop, power consumption is not much of a concern.

 

[Scrivs]

right, it's about half the price of opa1612, maybe cheaper, after test those chips I didn't back to bargain, maybe possible to get 1/3-1/4 price.
I hate such ugly clipping behavior(any real opamp of serious manufacturers have an ideal clipping without screeching) and one that fact is enough to me to consider that chip junk. However, I remember that the chip was about 3 times worse vs opa1612 regarding noise in I/U stage and even more noisy than opa1602 which draws 3x times less current. So I've no interest to use it and do not support the hype-makeup around that cheap chip. Seems it possible to buy a big enough batch of SGM8261 with any ordered marking, like "bravissimo", "virtuoso", "maestro" or even "mussolini" and BS like that to use inside of overpriced DACs
Actually, the ignorant datasheet itself is enough for an experienced engineer to see that this is junk, SGM8261 pdf looks more professional that's why I believe SGM is the origin.

Said like a true boss!

 

[pangcukaipang]

First post here, sorry for my bad English.

Just found this thread. I think this is the reason of the bass distortion on my case. I have Acmee 4x dongle dac amp (ES9038Q2M + RT6863) and it gives my IEM Dunu Talos (16 ohm, 100 dBSPL @ 1 mW) a distorted sound when I'm listening EDM with heavy bass section.

I'm so frustrated and bought a cheaper dac amp Kinera Celest CD-2 (CX31993 + MAX97220) to test, and it's okay. No listenable distortion on the bass section. I don't know how well the measurement of this CD-2 (probably not good, based on the other thread discussing CX31993 + MAX97220) but at least I can actually use it without ugly distorted bass sound.

I wish I found this thread sooner to avoid dac amp with RT6863 and SGM8261-2.