DJ21 is the smallest, lightest and most costeffective solution available. Suitable for the truly bass-insatiable, whose focus is on modern music that features frequencies well below the usual 40-50Hz range, this extremely compact sub weighs only 138 lbs and delivers output down to 24Hz (-3dB). The DJ21 is +2.5dB at 30 Hz while most subs are -10dB at 30 Hz. That’s an equivalent output ratio of 4:1 at the lowest notes.