What was the spl level of the Energy at 100Hz?
Tom Nousaine reviewed it in the Sep/Oct 2004 issue of Sound & Vision. There is nothing recorded for the 16Hz bar, nothing. At 20Hz, it was 85.9 dB spl. Not so hot. But, it did 113 dB spl at 32Hz.
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I would say, that is a considerable drop at 20Hz.