Brooks Cinema XR 607 Flutter

1) High-frequency variations in pitch of a recorded waveform due to fast speed variations in a recorder or playback machine.
2) Originally, and more formally, any variations (fast or slow) in pitch of a recorded tone due to speed fluctuations in a recorder or playback unit.

Line Input
An input designed to take a line level signal.

Brooks GS 15 Active Crossover
Uses active devices (transistors, IC's, tubes) and some form of power supply to operate.

Flat
1) Lower in musical pitch.
2) A slang term used to describe the sensitivity to frequency of a microphone, amplifier, etc., as being even at all frequencies, usually within 2 dB.
3) Refers to the frequencies on the EQ when they are arranged in centred neutral positions.

Brooks Cinema KP 30 Clipping
Distortion of a signal by its being chopped off. An overload problem caused by pushing an amplifier beyond its capabilities. The flat-topped signal has high levels of harmonic distortion which creates heat in a loudspeaker and is the major cause of loudspeaker component failure.

In
Short For "in the circuit," in other words "active."

Amplitude
The extreme range of a signal. Usually measured from the average to the extreme.

Critical Distance
The point a distance away from the sound source where the direct sound and the reverberant sound are equal in volume.