AAC Advanced Audio Coding.
ABR Auxiliary Bass Radiator.
AC Alternating current.
A/D Analogue-to-digital conversion.
AES/EBU Audio Engineering Society/European Broadcasting Union: typically refers to a standard digital audio interface.
AF Audio Frequency.
AFL After Fade Listen.
AGC Automatic Gain Control.
Aliasing The generation of in-band spurious frequencies caused by using a sampling rate which is inadequate for the chosen frequency range, i.e. it is less than twice the highest frequency present in the signal.
AM Amplitude Modulation.
Amp The unit of electrical current, named in honour of André Marie Ampère (1775–1836).
Anechoic Chamber A highly absorbtive room; the walls, floor and ceiling of which ...