Combination ground plane (for accurate LF response) + on-axis (for accurate HF response) at 1 meter.
I will be taking more measurements this week using a sampling of drivers (that just arrived!) but what is posted below is quite accurate.
---added Dec 29----
The updated measurement now reflects true sensitivity at 1 meter.
--------------------
sensitivity = 89dB @ 1w @ 1meter
response = 58Hz to 22kHz +/- 3dB
Confirmed: Pre-orders will begin production on Jan 10. Shipping will begin by Friday Jan 13. Same schedule for 340 SE.