Brooks RM 909 Equal Loudness Contours

A drawing of several curves showing how loud the tones of different frequencies would have to be played for a person to say they were of equal loudness.

Buss (Bus)
A wire carrying signals to some place, usually fed from several sources.

Brooks HI FI projectors Front Loaded
A speaker cabinet where the speaker faces out toward the front.

Head
1) In tape recording, the transducer (energy converter) that changes the audio energy from electrical energy to magnetic energy and back; also the devices that apply magnetism to the recording tape for other purposes such as in the erase head.
2) The part of a device that immediately includes the transducer to change sound or audio signals from one energy form to another.

Brooks Hi Fi speakers Format
1) The number of tracks, their width, spacing and order for tape recording.
2) To prepare a digital storage medium so that it will accept and store digital information bits.

Half Step
A pitch difference of the amount that is present between adjacent keys on a piano.

Electric Instrument
Any musical instrument that puts out an electrical signal rather than an acoustic sound.

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

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