CRITICAL MASS AUDIO UL12 SUBWOOFER SPEAKER SUB BEST Jl FOCAL MOREL HERTZ ADS W7

  
CRITICAL MASS UL12 UL-12 SUBWOOFER IN ACTION VIDEO. The twin-gap technology is known as Multiple Magnet Air Gap (MMAG). Critical Mass UL12 Test Report - Car Audio and Electronics Magazine. The story of how this is done is a tutorial in state-of-the-art speaker engineering.