Thank you for understanding!
I saw threads "bridged amps" , "bridging amps" and I thought that connecting two amps is bridging! But now I learned (thanks to you all) that its not 🙂 that its not!
This thing about those Nads c370 and 3020a being not real preamps but integrated I knew 🙂 At least I know something 😁
But I thought that connecting two good Nads into stereo system would produce good quality sound, and they are in my price range ,so that's why I taken them in account.
Honestly, that who sells those Nads doesn't push me at all. I just asked about amps in local facebook group and he said he have those (2400 and 3020a) if Im interested and thats all. The thing is, that then I learned that you can combine two amps into one stereo system. I checked local ads, and found a set of c270 and c370 for sale in my price range and also taken them into account.
Then I will think about nad c356bee vs. rotel ra 1062. Prices are very similar, Nad being little bit cheaper. But I guess price doesn't determine quality.
chatgpt is pushing me for Nad c356bee 😁