​@Xenomorph 

„Enough“ is quite individual…

I think for a mid size room a Sub Mini can do the hob quite well. If there is enough space behind your listening position, I strongly recommend using Era300 as surrounds, if you are playing atmos content. 

Thanks. The trouble is there isn´t space behind listening posititon because couch is close to back wall and surround spelaker would be near the head. I suppouse to hear Dolby Atmos i must buy the era 300. Era 100 doesn´t works with d. atmos, True ?

Both, Era100 and 300, are atmos compatible used as surround speakers. But Era100 is more limited and 2 of the 3 atmos rear channels are virtual. Era300 does play all of them real. 
Also it’s a personal decision… there are people who place Era300 quite near to their head, but I definitely won’t do so. 

I´ll try it. Thank you .