sound intensity level can be measured in dB & dB (A). What is the difference between the 2 scales?
I think dB(A) is average decibel levels.
The dB (Adjusted) scale takes into account the fact that the frequencies between 2,000 and 4,000 Hz cause resonance in the human ear canal and so are more damaging to our hearing. Sound intensity level meters which use the dB (A) scale therefore give these frequencies a certain weighting when they are detected because higher frequencies such as 5,000 Hz would actually be less damaging to the ear due to lack of resonance in the ear canal. However I have no idea what the exact mathematical link between the two scales is, sorry.
See this: http://www.safetyline.wa.gov.au/institute/level2/course18/lecture54/l54_09.asp
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