Most reverbs put the low end in the room with the rest of the note. The kick blooms. The bass grows a tail. High-pass the send and the weight drops out.

Gradient keeps the low end dry.

Lo-Split holds it centered and at full level. The kick and the bass stay the length of the note. The body above the split takes the room.

Near, Mid, and Far sit on that same split. A close room, a hall, and a long tail, on one insert.