2 J'utlise B1800 for 3 years now, nothing to reproach them ct reliability. Mine are not filtered, so I go through a crossover and an amp ddi.
Ct's, has pushed a lot. However the use of an equalizer to boost the TRS some low frequencies is a good addition. These boxes are really cheap, I advise no problem. Sure there are better, but may not be in this price range.