Devialet Chat

Hello. I am a happy owner of Devialet 140 expert pro, but would like to upgrade soon.
Would a second 140 Pro make a significant difference, ?
If not,  then maybe selling my 140 Pro and buy 440 expert pro?

Depends on what you are trying to achieve and if your current speakers will benefit from the extra power. There will always be the extra benefit of lower noise with going double mono I guess.