sensitivity of ultrasound transducer related to output
If you take a transducer with a rated SPL of 103dB(something) at 10V rms input, and drive it with 80Vrms, what SPL would you get out?

You may hope that the output will increase in linear ratio to the input. That is for an 8 times voltage input increase, the SPL would increase by 8 times, or \$20log_{10}(8) = 18dB\$ for 121dB(something) output.

However, 8 times is a lot of increase. If I was presenting a part for sale, that was capable of that output, would I list its performance at 1/8th of the pressure, 1/64th of its possible output power? Here's a Ferrari, it will do 20mph? I think not. I think if it were capable of 121dB(something) SPL, then it would be rated at 80Vrms input. I suspect it will fall apart long before it reaches that. 

But it might hold together, you might be lucky.