Combining 2 channel audio and home theatre

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.

I was in a similar situation, wanting to double-duty my audio system for 2-channel listening and H/T. I also have a Denon AVR (X-4000). Because my main speakers are Magnepan MMGs that require more power than the Denon has to adequately drive them, I added a separate power amp (B&K EX-442 Sonata at 350 wpc/4 ohm) AND preamp with H/T bypass (Parasound P5). I also have a powered sub (Rythmik F12G).

The integrated setup you’re considering would combine my two separates (amp/preamp) into a single unit. Not sure of the ultimate sound of what you might end up with, but I’m exceedingly happy with the performance of the system I put together for the money that’s into it. The Key to the Kingdom for a sound system to do double duty is a H/T bypass feature.

On a strange side note, when I’m passing through my preamp with it powered on and the bypass engaged, the system sounds better than if I pass my signal through it when it’s powered off, as it will pass the signal either way. I get some measure of signal bump, so it’s always on - which is where you’d be with an integrated any way. I expect my next move might be an integrated, if I can find something that matches the B&K/Parasound output I’m getting now.