The unit for measurement of the apparent (subjective) loudness level of a sound. At 1,000 Hz, the phon rating corresponds to the measured sound level. At all other frequencies, a sound level which – to the listener – seems to be of the same loudness as the 1,000 Hz tone, is given the same phon rating, regardless of the actual measured sound level.Phase shift, equalizer — The phase shift introduced in a signal path by the insertion of equalization.



"The original record I had sent was a very old, scratchy, out of print record that our family listened to years ago every Christmas Eve. It was especially played for my Italian grandmother who died in 1983. I cannot describe the emotion in the room when I played the new CD for my parents, now close to 80 years old. The memories were so good, and ..."