As with any sub, "boomyness" will depend on frequency response, which will depend on the room, the placement, EQ, and the sub's tuning.
As long as you set the rythmik to a lower tuning mode in its settings (IE 14hz), it's lower bass output should be balanced in most rooms. As long as you set things up properly, it'll be fine, with very low distortion and a hopefully flat in room frequency response. Again, placement is a big one. When you use two subs, placed distantly instead of one, frequency response flattens out more and across multiple seats.