Earthquake Sound SuperNova MKIV-12P Subwoofer:
HT Labs Measures
HT Labs Measures: Earthquake SuperNova MKIV-12P Subwoofer 
This graph shows the quasi-anechoic close-miked response of the MKIV-12P subwoofer, normalized to the average level from 40 to 80 hertz, which indicates that the lower -3decibel point is at 37 Hz and the -6dB point is at 31 Hz. The upper -3dB point is at 91 Hz with the "X-Over Freq" control set to maximum.—AJ
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