How many watts??

Maybe this related to power and sq.
I have noticed when listening at friend's system which is much more sophisticated than mine when listening at higher levels we can still talk to each other comfortably at the listening distance approx 12 feet from speakets without raising our voices too much . And the music seems more 3 dimensional.
When in contrast at my place as I turn up the volume we can't talk to each other as well.
Not sure if it is the quality of his system vs my system or room interaction his vs my room.

More than likely it is a combination of a little bit of all of those things. Detail and resolution are not just the ability to make sound fast, they are equally the ability to end sound fast. Every single component in the chain contributes in some way or other.     

More information is needed, specifically what are the speaker's rated sensitivity.

It is a hypothetical post or a troll post.
So I am not sure that more information is need? It is either answered generally and hypothetically or it is not.

Many amp designers say amps tend to work at their most linearity at around 20% of their full rated output. As has previously been posted, volume increases require logarithmic power output. Having an additional 80% of total power output for headroom is prudent. Running out of power; can lead to clipping; clipping can lead to speaker damage.
Speaker sensitivity, room considerations and desired volume levels will ultimately determine how much power one needs.
There used to be an oft repeated audiophile general rule of thumb; "double the manufacturers minimum power recommendation".

Hello,
I usually listen at modest volumes. Probably 60-70db and even a lot lower at sometimes. I was never impressed by playing loud. I am more impressed by how low you can play the volume and still hear the full dynamic range. One way to cheat this is add a subwoofer so you can still hear that deeper bass. I will tell you the preamp or preamp portion of an integrated amp is most important. More important than 80 watts or even 1000 watts. The amplifier is amplifying what the preamp sends it. Garbage in, garbage out. If you hear a his, hum, or distortion why would you want to amplify that. I have seen a 10w per channel integrated tube amp rock out. You should try it. But it’s the preamp, not the amp doing that. Your system is amplifying garbage from the preamp. If you can hook up a good preamp to your system you will understand what I am saying. If you are in the Chicagoland area borrow a Rogue preamp from this store to hear how good your system can sound. https://holmaudio.com
they let you demo in your home before you buy. No more buyers remorse.