Designed by musicians and studio engineers, the ButtKicker is musically accurate, with a tight, on-the-beat transient response and is used by some of the most demanding musicians in the world. The ButtKicker Mini Concert was created especially for studio musicians, home studios, or performers who need to hear the lows, but don't need the full on power of the ButtKicker Concert unit. Great for keyboard players, lighter duty drum use. Every player on stage, and every sound engineer can have just the right level of bass, without airborne sound waves.