In audio and home theater, Dynamic Range is the ratio of the loudest undistorted sound that can be produced in ratio to the softest sound that is still audible. For example the difference between a whisper and a loud rock concert (at the same distance from your ear) is about 100db – Decibels. This means, in mathematical terms, that the Rock Concert is actually 10 Billion times louder than the whisper. The standard CD is capable of reproducing 100db of dynamic range, while the LP record tops out at about 70db. AV Receivers and amplifiers that can reproduce the dynamic range of a CD or other source that can produce such a wide dynamic range are very desirable.