The horror! So sorry!
Does every thread on this site have to devolve into this?
Even on reference level equipment, you will still want to have EQ as an option.
While all components in the signal path are importantā¦ the speakers and their interaction with the room will have the most impact on the sound. In many situations, you can not always correct the room w acoustic treatment and this is where EQ comes into play.
Not everyone has purposely built listening rooms.
At the same timeā¦ you can also look at the speakers. EQ allows one to correct or change aspects about certain speakers.
If you look at your competitorsā¦ (outside of Eversolo) Some are doing this on comparable hardware.
There are different companies offering room correction and the results vary.
Right now Lyngdorf seems to have the best room correction on the market. Others tend to use Dirac and of course YMMV on its effectiveness.
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To do a proper room correction you need a good preamp/prepro that controls the sound of every speaker including subwoofers. Plus you need a great microphone & and a Laptop. You also need a lot of knowledge to run these Room Correction tools.
If Room Correction is your goal consider buying an Anthem AVM90 or a Trrinov.
If youāre going to go with a built in room correction, that would be Lyngdorf.
If you want to buy a good mic and use a PC running REW, you could get better results but its a lot of manual work.
Sub calibration would be interesting. Not difficult if you have dedicated sub output channel(s).
But getting back to the RS520 or RS151. You have EQ settings so you could do a parametric eq and also room correction w a USB micā¦ since you donāt have a mic input jack.
In terms of results. I used to have an AV receiver w room correction many moons ago. It workedā¦ meaning that there was some improvementā¦ but not really. YMMV.
For the correction I have an Accuphase Dg68. Itās expensive but fantastic
Iām in and Iām āposingā too.
And I have a Lyngdorf TDAI 3400 for it.
But Trinnov Audio isnāt bad either.
I donāt know how to operate it, though.
When someone shows off, psychologically itās often an attempt to boost their self-esteem or seek recognition. Itās a form of self-presentation that often aims to impress the audience.
Cheers 
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Basically, you need something that isnāt Rose and includes extra $10 in parts for sub output.
A calibrated microphone can be had for $40-80, depending on how fancy one wants to go. Better equipment will come with a microphone anyway. Laptop is not strictly necessary, higher end gear can generate corrections internally. Even a modern phone can do it quickly enough.
When one wants to play music, a surround system is not necessary. Any system supporting Dirac, or a Lyngdorf etc. will do a good job.
Surprisingly 
you are absolutely correct here, although with a PC and something like Acourate or Focus Fidelity you can get very good result wwith almost no manual effort.
Old AVR correction systems (YPAO and stuff) from years ago canāt be compared with modern DRC systems like RoomPerfect, Dirac, or Trinnovās (or Anthemās ARC, but Anthem are a less than honest company). Even Wiimās DRC does better correction for stereo these days.
Of course the level of improvement depends on how much there is to improve, but in general it will be orders of magnitude greater than anything to be gained from replacing streamers themselves or fiddling with cables, SFPs, or DACs.
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Boris,
REW is free. Just time and the cost of the mic and stand.
Thereās been some pushback on Dirac. I used it many years ago w my surround system ā¦
It was ok. Good for some improvements for home theater but that was it.
Room correction is also a must, although when you have to deal w wife approvalā¦ not always.
It is. Housecurve is free, if you have an iDevice. Focus Fidelity is the price of a single Dirac Live license and you can use it to correct any number of systems.
Sure, from audiophiles that, given possibility of manual configuration, turn it into a āsmiley faceā EQ and then are surprised to get digital clipping.
Is Dirac the best DRC system? No, there are arguably better ones. If done properly though it is beneficial. Heck, on the same room hooked to the same speakers, Wiim with RoomFit will sound better than a Rose without doing some external DRC.
Room treatment you mean, I presume? It is, some things canāt be fixed even with DRC.
Yes, thatās right!
Even RoomPerfect is not a god.
RP takes its measurements at a minimum of -40dB. That means if I assume the device is at full volume (0dB), it will take the measurement at a volume of 60%. Yes, and I know I canāt really compare it like that!
I listen to music at room volume, around -70/-60 dB (that is, 30-40% of full volume). But when I go into another room, I can already hear a slight bass rumble. Everything is fine right in the music room.
Of course, all inanimate objects, or even we ourselves, are excited by sound (acoustics). A perfect room (letās say) doesnāt exist. Perhaps the former Wolfās Lair would be a near-perfect room, but even there, the acoustics would interact with the speakers themselves, which would then produce the sound.