The THE21 SUB PRO ACTIVE VENTED impresses with its unrivalled volume level of 130 dB continuous and 133 dB peakpower. For a better understanding: An THE21 SUB PRO AV is significantly more powerful and louder than eight standard 18" subwoofers combined. The THE21 SUB PRO AV also joins this unique performance to an outstanding bass capability. Compared to conventional motorconcepts, the ultra-modern double-gap motor of the custom-made 21" driver with two outer and two inner voicecoils enables much faster directional changes with higher sound power and significantly lower power compression.