@mijostyn : Balanced force in sub's is not something new, Thiel and ML did it along other manufacturer before.
" I am surprised that nobody is making cylindrical subwoofers. " , not today but in the past HSU was a proffesional proponent of that design and they manufactured subs's that gone as lower as usuable 4hz frequency.
In reality, it's almost nothing new about sub's but differences in its quality design implementation and digital crossover technology that in the past never been used.
R.