ESI Aktiv 10S

-first it is very not flat, 30Hz cutoff specs is very kind, maybe at-20dB then? And even with the lowest cutoff dial? Basically just a potatoidal frequency response.
-add to that that specs are wrong: the 100Hz cutoff for satellite is wrong, this is actually 50Hz and the switch is reversed also. I swapped between 3 different units I think (hanks Thomann) before doing the measuremtns by myself... And obviously no news from the manufacturer since I presented them the final results showing their device was not to specs...
-so both combined it doesn't make it very useful by itself, plan separate equalization for the sub and for your satellites if you want to do something clean...
But I still kept it because in the price range it has nice options (phase, footswitch...), and once separate equalization is achieved the entire setup sounds nice. Just beware of what you are buying.