@luisfelipe_lfo
I think you're on a crossroad that could either take you a lot of money and years to discover what makes are real difference or set a path that makes it easy and clear.
We've all been where we believed amps have a sound signature, speakers are like instruments and people all have a different preference. I've been there and looking back it's been a massive waste of time and money. If I can, I would like to point you in the direction so you don't need to go through the same confusion I had to.
That's why I would recommend you look for speakers that have a smooth frequency curve on axis, and an off axis (10, 20, 30 degrees) a frequency curve that follows the same line. This means that the direct sound you get from the speakers is as much as possible the same as the music that is being played and you and others in the room experience pretty much the same.
It also means you can easily adjust the sound to your liking.
A good example of that would be any speaker from Genelec, with an special mention from me for the G series (G3, G4 for your room probably, you can ask Genelec for advice). Now this is powered speakers, so the power amp is in there but the preamp needs to be bought seperately. I personally have enjoyed music more and better since I've gone this route.
Passive speakers, with no amplification in them, need to have the same traits to be considered good by listeners in a blind test. Results are published here on asr and spinorama.org. From personal experience the Elac dbr62 are very good, enjoyable and exceptional for the money. Kef is too, so is Revel. A very good diy option apparently is the Audio first Fidelia.
However, in my experience you soon reach a level where upgrades in speakers make less sense. Ime if you have a good two way speaker, so tweeter for the highs, woofer for the mid and lows, if you get the basics right as described above there is a lot more to be gained from a subwoofer and a (dac/preamp/amp) that has a crossover for the sub plus an ability to apply eq.
In my experience this makes a massive difference, compared to a small one for speakers if we're talking about say 750 euros for speakers compared to say 2000 - 4000 euros for speakers.
That's why I would recommend you keep on the path you are with the Denon avr or choose a Wiim ultra or a Lyngdorf. Choosing speakers is far and away the most important. Of the speakers you listed imo only the Kef are ok. Look up speakers here on asr, watch a video, listen to Genelec to get a sense of what I mean.
Hope you do well. All the best.
Curious what Genelecs go for where you are....good luck!
, so, I've to re-think all over again.
