Brooks Cinema TX 509 Ambience

The portion of the sound that comes from the surrounding environment rather than directly from the sound source.

Centre Frequency
The frequency of the audio signal that is boosted or attenuated most by an equalizer with a peak equalization curve.

Brooks Cinema Series Capacitance
The property of being able to oppose a change in voltage or store an electrical charge.

Full Range
Describes a sound which covers all audible frequency ranges. As in "full range speaker cabinets."

Brooks QS 70 Active/Inactive Microphones
Scientific definitions aside, active microphones generally sound better than inactive ones, but they generally cost more. They also require the use of either a battery or phantom power while inactive mics need only be plugged into the mic cord in order to work. In most playing situations, the subtle improvement in sound quality from an active mic isn't worth the extra cost and hassle. One possible exception it the headset mic. Put simply, inactive headset mics just plain suck. Active headset mics put out a much stronger signal and feed back much less.

Crossover (Crossover Network)
A set of filters that "split" the audio signal into two or more bands (two or more signals, each of which have only some of the frequencies present).

Haas Effect
Simply stated, a factor in human hearing where delay has a much bigger effect on human perception of direction than level does.

Compression Ratio
How many dB the input signal has to rise above the threshold for every one dB more output of a compressor or limiter.