I doubt that. Given that the Super cube is rated down to 16Hz, and the Tom Nousaine testing shows it's 44Hz at -2.3dB, I would say there is some misinformation going on.
SheepStar
Def Tech Says that the BP10B has an "OVERALL" Freq Resp of 20Hz-30kHz.
If you ask Def Tech for the +/-3dB Response, it is 30Hz-20kHz +/-3dB.
Julian Hirsch at Stereo Review Independently tested the BP10B in their lab. They measured the BP10B to have a Response of 25Hz-20kHz +/-3dB & 20Hz-20kHz +/-5dB.
So was Def Tech MISINFORMING by OVERINFLATING their +/-3dB of 30Hz-20kHz?
Or was Julian Hirsch and Stereo Review LYING?
Def Tech said the OVERALL response of the CLR3000 is 19Hz-30kHz, but the +/-3dB is 28Hz-20kHz.
Tom Nousaine independently tested the CLR3000 and found it to have a response of 28Hz-20kHz +/-3dB.
Was DefTech giving wrong information about the CLR3000 +/-3dB response?
Or perhaps different labs, different people, different rooms, and different techniques all play a role in creating all these differences?