Combining 2 channel audio and home theatre

Hello,
I apologize, I just saw you have the correct AVR. You just need to reassign the front amps on the AVR or turn them off in the setup menu. Get a nice used amp. 10 years old or less so the CAPs are still good. I say look at shiit audio for new amps. Stay away from tubes because you might get ground loop hum since you are using your Denon as a preamp and AVRs usually do not have a ground plug on the EIC plug in the back of the AVR. Very high bang for your buck. Or an older two channel Marantz amp which will blend nicely with your Denon AVR since they share a sound signature.  Try to get close to 100 watts. No need for anything above 150w. You can look at the posts in audiogon about having too much power. Good job on the AVR selection!

I made a mistake :
´´Tidal uses ´´ Leedh Processing ´´ and it is better with amplifier only.´´

It is Lumin that uses ´´  Leedh Processing ´´ .
It is the streamer ,I use to stream Tidal.

Hshf totally wrong the preamp in the denon will. Kill the systems Ultimate sound quality

We did a denon vs a Cambridgeu  audioreceiver and the Cambridgesoundeded way better

By all means do it! Most receivers have much better "front ends" than the power amp sections. It's a good place to start. As long as you have "Preamp Outputs" you can add multi channel power amps or multiple single or stereo amps (maybe just a stereo amp for your front speakers - let the receiver drive the center and rear channels). The DSP features of receivers and multi-channel sound synthesis are not to be ignored. If it's a receiver with multiroom capabilities, you can use those channels to drive subwoofers. Later, you can get a "real" front end like the Emotiva MC-700 and enjoy the amazing improvement. Look for used ones. Keep the receiver for the FM tuner and the ability to put god sound in other rooms.

I am in the exact same spot, having a relatively new dedicated room, and the need for both HT and 2ch music.  Since I am still on route I have a mixture of old and new.  You have great pointers from the guys:
1. using HT RV with amps
2. using two subs
3. upgrading room acoustics
4. upgrading components as budget permits (buying second hand is a great suggestion)
5. enjoying the route not only the end result...
This is what worked for me:  I went with the Canadian Anthem MRX720 7.2 (debated on Denon/Yamaha. The anthem has less bells and whistles but is said to be more solid for music) as my HT system core.  My next step would be adding amps to the two mains and using the anthem as a pre (which I am currently looking at and debating on mono’s if budget permits).  Another thing that really worked great was adding two subs (SVS4000 X2) which did in fact take the low end load of my old AR94’s and did a super upgrade (for time being until budget permits to upgrade the AR’s...which are 40 years old but still kicking).  Room acoustics is my next step, but if budget does not permit, then furniture and simple “books” on a book shelf will do a decent job meanwhile.