Audio amplifier specifications

measure comparing the level of a searched signal to the level of background noise

quantitative measure of the output spectrum of a system or device in response to a stimulus

In signal processing, distortion is the alteration of the original shape (or other characteristic) of a signal. In communications and electronics it means the alteration of the waveform of an information-bearing signal, such as an audio signal representing sound or a video signal representing images, in an electronic device or communication channel.

ratio between the largest and smallest values that a certain quantity can assume, often used in the context of signals

In electronics, crosstalk (XT) is a phenomenon by which a signal transmitted on one circuit or channel of a transmission system creates an undesired effect in another circuit or channel. Crosstalk is usually caused by undesired capacitive, inductive, or conductive coupling from one circuit or channel to another.

the distortion produced by an amplifier, as measured in terms of the harmonics of the sinusoidal components of the signal that it introduces

measure of the opposition to current flow, both static and dynamic, into the load network being connected that is internal to the electrical source

measure of the opposition to current, both static and dynamic, into the load network that is external to the electrical source

thumb|upright=1.4|A frequency spectrum plot showing intermodulation between two injected signals at 270 and 275 MHz (the large spikes). Visible intermodulation products are seen as small spurs at 280 MHz and 265 MHz. right|3rd order intermodulation products (D3 and D4) are the result of nonlinear behavior of an amplifier. The input power level into the amplifier is increased by 1 dB in each successive frame. The output power of the two carriers (M1 and M2) increases by about 1 dB in each frame, while the 3rd order intermodulation products (D3 and D4) grow by 3 dB

ratio of impedance of a loudspeaker

electrical power transferred from an audio amplifier to a loudspeaker

Concept in electrical and audio engineering

type of electronic distortion