I hear you, but I have always found this mfr. to be honest in the past and so have to give them the benefit of the doubt. They post plus or minus 3 dB bandwidth and 10 dB down freq. Thus while frequency at which sensitivity is measured is not specified, it is bounded. If I get into a conversation with them I will ask about freq response graph. Carvin is not a fly-by-night outfit. What would be a "standard" frequency to measure sensitivity for subwoofers anyway?