Since Rose’s programmers might be teenagers still living with their parents, and probably can’t find their asses on an aircraft carrier’s radar, I prefer a standard format like wav. 
So far you haven’t managed to say a single thing worth paying attention to.
Which was very easy.
And what would they be good for exactly? Playing the two Diana Krall tracks on repeat, as proper audiophiles do? They sure don’t work for listening to music.
Which just goes to show that a) you have no clue about acoustics, and b) even worse, nice people at Mon don’t either. Really, anyone who even starts saying something as dumb as “fast speaker” let alone “fast subwoofer” (or recommends a REL as anything other than a butt of a joke) has no business talking abvout Hi Fi anything.
As if it were an achievement. So would a Wiim.
Fosi doesn’t have a screen though, which is 520’s one and only selling point. Ironically (or not) most Fosi amps are better than the one in 520. Or the one in RA-180 for that matter.
Most Fosi’s would sound better, actually, because they were designed by people competent at designing amps. Citech’s competence is in designing LCD display panels. They are supposed to be quite good at it. They can even assemble a reasonably decent (apart from the software being crap) standard streamer (150/250) which works, sonically, as well as anything costing 1/10th the price. As soon as they try to design something original (like the RD-160 or RA-180) results are quite pathetic. Although the 180 must be selling quite well among the “never could afford a Nagra, and never even seen one up close, but likes to imagine that he did” crowd.
And Smegmel the Stupid is still an idiot.
Can’t really argue with that!
I am really still amazed that they haven’t managed (knock on wood…) to break the Roon functionality so far. Probably because 95% of it is Roon’s code… And with Roon at least everything is sent to Rose in uncompressed PCM (or DSD) format regardless anyway, while I have my checksum guarantees and working metadata in the files.
Boris you keep proving my point.
You really don’t know what you think you do.
And since you prefer the FOSI, you should hang w Amir.
Just out of curiosity, what do you do for a living?
Are you in IT?
Have you ever developed code or a system?
Do you understand the complexities?
While working as a senior developer for a client, I remember getting stuck pulling 38hours straight every time we had a quarterly release. Or getting pulled out of meetings and my work to do an emergency patch to fix mistakes made by others.
So yeah, I know what it takes to build out a platform and understand that its very easy to bork things when releasing updates.
It seems that Boris may not be the only one sitting in his parent’s basement.
You can’t have a point because you have neither a brain nor any education in any of the things you so self-importantly try to talk about. You lack even the most rudimentary basics of physics (well, not really surprising for an American high school dropout) to comprehend just how laughable anything you say is.
Even if it were the case (not that you had any qualifications to judge) it would still be orders of magnitude more than you ever did or will.
Well, Boris had developed some rather large systems (whenever your momma lets you browse somewhere else away from this forum, which keeps you so easily occupied, you are likely touching some of it; and that Rose that you are so proud of having begged your parents to buy for you made it here thanks to the vessel routing code I worked on, too, but of course that all would pass right through your skull without ever encountering any grey matter). While there certainly would be bugs in any software released, Rose’s go well beyond that. Neither do they do any quality control nor do they even have any idea what they update would actually do.Not like it takes a genius to at least have some unit tests that check if the update procedure wipes out audio settings. And if it does warn end-users to write them down (since saving them is as much beyond Rose’s capabilities as designing a power amplifier).
Why these verbal sparring, each one more or less rude than the last?
There doesn’t seem to be a moderator on this forum.
For those who like to insult each other every other post, prefer send you private messages; you have tools on this forum to do so.
Please, for everyone’s benefit, let’s get back on topic:
[Officiel] Version logicielle de SW Ver 5.9 (Rose OS 5.9.07)
Thank you all!

Merci Dominique.
C’est effectivement pénible à force
No need to go back to topic, because we just received a new version! 
https://community.roseaudio.kr/t/official-sw-ver-5-9-rose-os-5-9-09-software-release/12817/4
So, that we all start again on a good basis.

It’s great that you tell us you work in systems. In fact, you sound like a HiFi Rose employee, justifying everything. All I know is that I paid thousands of dollars for a product that, after an update, isn’t the same. I hate any kind of justification; a company can’t just put crap on the market and sell it like caviar.
I hope the update works for you JMBARG. It might improve your demeanor. Fingers crossed.
Sorry Jose, I just happen to be a satisfied customer.
I did the update this morning. (Ironically I don’t think you see the update notification unless you power off the unit rather than just go into standby. )
Like Before, I don’t have any major issues… so far.
I agree that if you paid thousands of dollars for a piece of equipment, you should be satisfied.
But here’s the thing.
You’re the only one who is having this specific issue.
A population size of one isn’t enough to draw any conclusion.
I understand how you feel… but unless someone else has a similar issue… what do you expect Rose to do?
Update went fine, both units still work and had even kept output settings this time.
One thing noticed is that while every other VU Meter style works, needles moving furiously, the colored bars style doesn’t. It just stays flat, whether Input or Output is specified in VU settings.
There’s always something, huh! How incredible that everything they touch, they break, and sometimes, they improve!
The latter happens quite occasionally though, while the former quite consistently…
On both 250 and 520, the horizontal bar style VU Meter does not move. Same track, at the same time, produces quite noticeable movement in all needle-style meters.
And speaking of broken things, the 520 kept the Qobuz login. The 250 required me to log in again. But of course logging from the device did not work. You can enter the username and password (of course removing the “User name” and “Password” hints from input boxes, once you start typing, would be too much to ask, so you can’t even easily see how many characters you have typed) but clicking the login button does not do anything. But… but… if you hold it you can select a word inside the button and get the standard Android pop-up. Can even do a web search for the selected word (opens Chrome just fine). Just not logging in. At least that worked from the app, but still annoying if not totally unexpected.
JMBARG
No, buddy, you wrote more than once that the new software changed the filters and that this meant you couldn’t listen to music with your favorite filter.
So I decided to play around with the pre-update filters, as I haven’t updated yet, and in my opinion, the differences are very subtle. I play guitar, and I also do it by ear. I suspect you don’t play any musical instruments, so your hearing probably isn’t any better than mine. So, in my opinion, that’s not the reason your device sounds worse after changing the filters. Because the difference in filters before the update, I’ll repeat, is very, very tiny.
I never said it changes the filters, it seems to me that from programming so many applications your eyesight is tired.
Well it appears that not everyone gets the update…lol
Go figure…
They never did properly…