In a shelving equalizer, the frequency at which the equalizer begins to flatten out, or shelve. Defined as the frequency at which the level is 3 dB above (or below) the shelving level.
"I received my c.d. today and had to let you and everyone else out there know how happy I am. I had an album that has been out of print for about 15 years. I always dreamed of finding someone out there who could magically turn this into a c.d. that I could listen to in my car and on my home stereo. When I found this company I rushed my album ..."