Units of sound pressure level, example: 120 dB re 20 μPa

[rwooduk]

I am trying to do a calculation using a value of -211dB re uPa/V , are these SI units? i.e.

if OCV = -211db re uPa/V

and I have

RL = 20log(Vrms) - OCV

Do I need to convert the OCV to standard units before putting it in the equation?

Wiki isn't so clear about this:

Such large measurement ranges are conveniently expressed in logarithmic scale: the base-10 logarithm of 1012 is 12, which is expressed as a sound pressure level of 120 dB re 20 μPa. Since the human ear is not equally sensitive to all sound frequencies, noise levels at maximum human sensitivity, somewhere between 2 and 4 kHz, are factored more heavily into some measurements using frequency weighting.

 

[rwooduk]

ahhhh its just a reference, you just put in -211