Brooks HI FI projectors Ground Lift

A switch that breaks the connection between the ground point in one circuit and the ground point in another circuit.

Harmonics
Integer multiples of a fundamental frequency, the fundamental itself being the first harmonic, its first overtone the second harmonic, etc. Attributing to instruments, voices, etc. their distinctive timbre.

Brooks RM 909 reviews Light Emitting Diode
A light that allows current to flow in one direction only and emits light whenever a voltage of a certain level or beyond is applied to it.

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

Brooks Hi Fi reviews 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.

Acoustic/Acoustical
Having to do with sound that can be heard by the ears.
AcousticsThe behaviour of sound and its study. The acoustics of a room depend on its size and shape and the amount and position of sound-absorbing and reflecting material.

Input
1) The jack or physical location of where a device receives a signal.
2) The signal being received by a device.
3) The action of receiving a signal by a device.

Chase
The automatic adjusting of the speed of a recorder (or sequencer) to be time with another recorder.