UPDATE 8/2/23:
Exactly 5 months after purchase, the Bluetooth function is now nonexistent even though the blue LED is on.
I have followed all the recommended steps given by the manufacturer, but it does not appear anywhere as a Bluetooth device (tested with 4 mobile phones and 2 laptops).
I returned it to the supplier for replacement, after updating and discussing the issue with Edifier Support, who responded promptly.
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Although most of it has been mentioned in previous reviews,
I will also add my experience and initially say that it is a value for money purchase.

Packaging:
Well-packaged, with everything needed to operate, including connection cables and a remote control.
Certainly, the RCA is basic, but with a little extra money, I upgraded it to something slightly better.
The remote control is indeed very minimal, but personally, it doesn't bother me as long as it functions.
I wouldn't want anything more.

Appearance and construction:
Incredibly simple, it is a gem and the construction is sturdy and well-crafted, with nothing to envy from much more expensive options, at least in terms of their exterior.
You can only understand this by seeing them up close. A significant reason for choosing them, as strange as it may seem, is that I have them in the living room and wanted them to perfectly match the space.

Technical specifications:
Multiple inputs and Bluetooth are also a primary reason for purchase, so that everyone in the house can listen to music from their mobile phones via Spotify.
The knobs on the side for volume, bass, treble, and input selection have distinct colors.

Sound performance:
I am not an audio expert or professional to have an in-depth opinion.
I have connected the turntable to a preamplifier to listen to vinyl records in a space of about 35 square meters.
Because I listen to various genres of music, mainly rock, metal, but also synth/electro, in my own ear, the speakers seem to perform better with electronic music.
They definitely have power, but I always have the bass and treble settings turned up to fully enjoy the music and have a full sound. If you set them lower or at 0, they seem weak and muffled.
If someone is used to a 2.1 system with a subwoofer, they might miss the power in the bass.
Obviously, if they are connected to a PC or even a mobile phone where you can play with the equalizer, things change, of course.
I have not encountered any issues with Bluetooth, such as lag or interruptions.

Certainly, at 90-100 euros, they are decent. However, before making a purchase, I recommend watching/listening to reviews online, if not in person, in order to form the best possible opinion.

Purchased at €103 on offer.
Positive:
1. Full sound, good frequency response at high volume. (Balanced curve in the photo at 85db max vol.)
2. Many connections that work perfectly (Bluetooth 4.0, optical/coaxial with max audio resolution at 24bit/48khz, line in 1 and 2)
3. Included cables: optical fiber, RCA to RCA, RCA to 3.5mm minijack.
4. Remote control.
5. Amplifier with low harmonic distortion (somewhere I found it to be 0.05%, very good if true, but I mention it), treble/bass/vol controls on the speaker.
Negative:
At low volume at a distance of 1 meter, they lose a lot in frequencies, especially in the highs which almost disappear, and the bass and mids overpower (except for the snare area which also gets lost). I should note that the distance and overall placement of the speakers play a big role in sound quality, so the ability to adjust bass and treble is a big plus if there is no standard volume and distance adjustment.
Conclusion:
Very good speakers for many uses. I did not find any negative that would prevent their purchase. For what they offer, they are definitely a value for money choice.

A friend had recommended them to me and I was checking the reviews here and on other Greek and international websites, and I was thinking, are they really that good...??? And ever since I got them, I can't get enough of them. They are among the best speakers I have ever heard, even compared to much larger and more expensive sound systems! They may not have the same volume and power (not that the Edifier's lack in that department!), but in every other aspect... they surpass expectations! Incredibly clear sound with a power that makes you wonder if you bought a professional machine! Balanced treble and bass, fantastic clear sound. Even at maximum volume (which is more than enough for a living room), they are still satisfying, as well as for TV and movies, and even for mini parties with friends, you will be covered 100%. For a gaming or small room, just with half the volume, you will feel great and completely satisfied. The connectivity is complete and all the cables are included in the package. The Bluetooth connects instantly and easily, the quality and appearance are very good, and the price as well. They make you want to listen to music more and more. Overall, one of the best purchases, if not the best, in their category.

I use them with optical fiber on my television, to have better sound than the nonexistent speakers of my Samsung smart TV, Netflix, YouTube (Music and mainly live concerts), and music through digital platforms like Spotify, Deezer, etc. I also stream music from my phone via Bluetooth. Let's start with this!

Very good sound, for speakers with 4-inch woofers, incredible connectivity, connects and disconnects automatically even when already connected to the phone's Bluetooth headset for calls. Good response from the EQ knobs, and if you exaggerate with the bass at high volumes, the sound will compress and cut off the information very noticeably. It is for normal home use, for at least a decent sound when you don't feel like setting up a turntable, amplifiers, and searching through your record collection for what to listen to. The result that reaches our ears is louder than the sound output from the television via optical fiber. Let's move on to this use now.

It truly transforms your television. Give it a lot of bass to have a bit of the illusion of a subwoofer in movies and lower it for music. Nothing more, nothing less.

Opinion on sound quality: Very good sound FOR THE MONEY! I wasn't blown away, but okay, it's a 4-inch speaker with a built-in 42W amplifier and 4 connections and a remote control! Okay, let's not get carried away, what else do we want? It doesn't have a very wide sound color palette like a good bookshelf speaker, but as I said, it's something else! When I want quality, I'll listen on my Rega Planar 1 turntable with Dali Spector 2 speakers... It has a good EQ response and the power you expect from its size, which by the way is very convenient, they are quite small but beautiful. I didn't find significant differences with or without the cover, and its bass reflex is in the front, which means you can even mount it on the wall if you want without fear and without experiments like "at a certain distance from the wall, the speaker hits its bass better..."

General information. The brown color is beautiful! If it matches your space, go for it! All functions except bass and treble can be controlled by the very small but very useful remote control, so be careful not to lose it! It has all the cables you need, even the optical fiber cable, and the power cable is about a meter long, which means you probably won't need an extension if you have a socket nearby.

In conclusion, I HIGHLY RECOMMEND IT, nothing better for this price, believe me, I did my research. If I wanted something more, I would pay an extra 20-30€ if it had a subwoofer output! You want a lot!

Well!
I use the speakers for 3 days after I write the review.
In terms of build quality, they are perfect!
Now, about the sound: the sound is very good for their price, but also very loud. (I tried them with high-quality sound sources such as original sounds, which are in perfect quality, Spotify, Soundcloud, etc.) and of course, YouTube :P
One negative aspect is that the cover, when placed on the speakers, in songs with bass like (Melanie Martinez - Carousel) and similar songs with such bass, it sounds like you're touching a piece of paper on the speaker and it makes this crackling noise, while if you have the speakers without the cover, they sound fine (now I don't know if this happened to me).

In a few words:

Positives:
+ Very good sound!
+ Very nice and deep bass! And not like the bass in computer speakers 2.1, etc. where their bass is like it will turn off the tractor.
+ Bluetooth, of course.
+ Remote control.
+ And it comes with all the cables you need in the package.

Negatives:
- What I said above about the cover, but the good thing is that you can remove it, enjoy their sound, and it looks nice without it.
- The price is a bit high.

That's it!
I will update if anything changes in the future.
I hope I helped! :)