My LS-8's have an old EIA rating of 42 dB. People who have measured the LS-8's say they are around 91-92dB by todays standards.I found some paperwork in my files that say the MC-8 is 93.792 dB sensitivity (this was from someone's measurement from one of the forums).
I have some early 70's EV literature that claims 97 dB sensitivity.
Dave