Your basement is similar to mine (concrete walls and low ceiling). My walls are finished but that doesn't make much difference. I've done a little research (not an acoustical engineer) and would say that the acoustics are bad. Some frequencies cancel each other out. Without adding acoustical treatments there is not much you can do except maybe putting the bass cab on the front wall in the center of the room. You could experiment with some cheap bass traps.
How effective are Bass traps for room accostics?
How effective are Bass traps for room accostics?