Loudness Equalization?

Question

What is it and why use it?

Answer 1

The ear does not perceive sound linearly as the volume is increased or decreased.  As volume level decreases, the lowest and some of the higher frequencies appear to drop off sooner than mid frequencies.  Therefore loudness equalization was created to boost the high and low frequencies at lower volume levels.

You may wish to read this article that talks about hearing and loudness contours.

http://www.moultonlabs.com/more/equal_lo...