Acoustic suspension – It is a sealed or closed box speaker enclosure, also referred to as an infinite baffle. Acoustic suspension speaker systems are generally less efficient than Bass Reflex or Transmission Line designs, but may offer greater accuracy with respect to bass tightness and reproduction.
Acoustics - the science or study of sound.
Alternating (AC) Current - currents that have harmonic time dependence.
Ampere (A) – Ampere is the unit of measurement for electrical current in coulombs per second.
Amplifier - an electrical circuit designed to increase the current or voltage of an applied signal.
Amplitude - the relative magnitude of a signal.
Anamorphic - This term is used, and often misused, in a variety of ways. To the laymen it is most easily described in terms of a DVD or image that has been condensed horizontally in order that the source component or output device can make use of more, or all, of the available pixel data on the source media (typically a DVD or HD-DVD). Anamorphic or CinemaScope lenses can work in conjunction with a dedicated video processor to render a constant height image properly onto a 2.4:1 screen.
Aspect Ratio - This refers to a ratio between the width and height of a display or image. Typical aspect ratios include 4:3 (also called 1.33:1), 16:9 (also called 1.78:1), 1.85:1 and 2.4:1.
Attenuation - the reduction of an electrical signal.
Audio frequency - the acoustic spectrum of human hearing, generally regarded to be between 20 Hz and 20 kHz.