A term widely used in artifical reverb systems to describe a reverberant space with a specific sonic character. Typically, a chamber reverb is generous and dense, but usually with greater focus and clarity, and less duration, than a Hall reverb. Histortically, a physical reverb chamber was a moderate sized room with tiled surfaces and often glazed pipes stood on end to increase the reverb density, in which one or more loudspeakers reproduced sounds which were picked up by one or more distant microphones.

The noise floor defines the amplitude of the sum of all noise sources and other unwanted signals within a system. This could be the ambient acoustic noise in a room, or the electrical noise in a recording system or other audio equipment. In  a high quality audio system the noise floor is typically around -100dBu or better. The total dynamic range capability of a system is normally defined as the difference in amplitude between the noise floor and the highest signal that can be passed without distortion.

Relating to the waveform characteristics of an AC signal such as an audio waveform. It decribes the ratio between the peak amplitude and the RMS level. The 'peakier' or more dynamic the signal, the greater the crest factor. Crest Factor is normally expressed in decibels.

A pure sine wave has a crest factor of 1.414 or 3.01dB, while a triangle wave is 4.77dB and a square wave 0dB.

A 'Dummy Head' is a binaural recording array which intentionally resembles (to a greater or lesser degree) the size and shape (and sometimes also the density) of the average human head, with two microphones placed on opposite sides in the positions of the ear canals. The idea is to capture passing sound waves in the sa,e way as a normal listener would perceive them, with the correct inter-aural time delays and head shadowing effects which are critical to assessing directional cues.