Isn't the mod normally done on B3s or are they already low sens like the 4061s? Not sure I've ever seen anyone run B2Ds?
I know there are B3's out there that have been modded.
These B2D's come in three sensitivity levels. Mine are the W5 (middle sensitivity):
(pasted from Countryman website)
FREQUENCY RESPONSE:
50 Hz to 18 kHz
CABLE BREAK STRENGTH > 45 lbs
WEIGHT: 0.07 oz (2 grams)
SENSITIVITY:
W4 (no band): 6.0 mV/Pascal
W5 (red band): 2.0 mV/Pascal
W6 (blue band): 0.6 mV/Pascal
EQUIVALENT ACOUSTIC NOISE:
W4: 34 dBA
W5: 39 dBA
W6: 44 dBA
OVERLOAD SOUND LEVEL:
W4: 120 dB SPL
W5: 130 dBA SPL
W6: 140 dBA SPL
CABLE LENGTH:
5 Feet