On their AE page, they showed the graph below. I hope that it is not very accurate; otherwise, the ZSN is going to sound weird
Am I the only one that finds this graph as not only wrong but pretty close to impossible? I have never seen a driver that managed an inverse roll-off and actually increased through the entire sub-bass range. Combine that with a near linear cut off at 9k and I'm calling BS on this one. Something very wrong with the test instrumentation and yet another example of why measurements should never be looked at as gospel.