Brooks Speakers Cut-Off Frequency (Turnover Frequency)

1) The highest or lowest frequency in the pass band of a filter.
2) The highest or lowest frequency passed by an audio device (the cut-off frequency is usually considered to be the first frequency to be 3 dB lower than a reference frequency in the middle of the bandwidth of the device)

Keyboard
1) Any musical instrument controlled by pressing a key.
2) The part of the computer that has the keys.

Brooks BA 71 Cycles Per Second
A unit used in the measure of frequency, equivalent to Hertz. Cycles Per Second is an outdated term replaced by Hertz in 1948.

Head Amp
British name for Preamplifier (A low-noise amplifier designed to take a low-level signal, such as the output of a tape head, and bring it up to normal line level).

Brooks VT-50 Amplitude
The height of a waveform above or below the zero line.

Hum
The 60 Hz power line current accidentally induced or fed into electronic equipment.

Early Reflections
The first echoes in a room, caused by the sound from the sound source reflecting off one surface before reaching the listener.

Compressor
A signal processing device that does not allow as much fluctuation in the level of the signal above a certain adjustable or fixed level.