Rel vs. Vandersteen vs Audio Physic subwoofers

Gregm, How could Rel and Vandersteen more authorative in reproducin sub-bass if their cut off frequency is higher?

Thanks

Because they produce spls with more ease. It's not only the extension that counts, but also the (dba) level where the device maxes out (& distorts or, worse, develops a problem).
Cheers

Thank you for your answer. Distortion is, in fact, higher with the same pressule level when power is lower.

About the 10Hz issue... Yesterday I obtained the spectrum of what I thought it was a 'boomy' modern disco CD. It has, in fact, low frequencies, but these compenents are below 30dB than the main boom-boom frequency around 40Hz.

This was a great surprise for me.