This doesn't answer your question but i've found countryman to be very responsive to questions.
Here is some info i previously received from Rosa @ countryman asking about the max spl of RED band and No band versions of B3.
NO BAND
B3 W4 (no band)
SPL 130 dB, Output Connector: pigtails or wireless connection as specified
SPL 140 dB, Output Connector: XLR-3 Male (contains preamp)
RED BAND
Wireless: 140 dBA SPL (5V, red band)
Phantom: 150 dBA SPL (48V, red band)