Gain and Loss

Gain is:
1) A knob usually found at the top of each input channel on the sound board, used
to set input levels of the separate channels to relatively equal positions.
2) The amount of increase in audio signal strength, often expressed in dB.

Gain:The measure of how much a circuit amplifies a signal. Gain may be stated as
a ratio of input to output voltage,current or power, such as a voltage gain of 4, or a
power gain of 2, or it can be expressed in decibels, such as a line amplifier with a
gain of 10 dB.

ConductiveHearing Loss: a loss of sensitivity to sound, resulting from an
abnormality or blockage of the outer ear or the middle ear. The most common
cause of conductive hearing loss is middle ear fluid or infection. Other causes
include wax build-up in the ear canal, a hole in the eardrum, or damage to the tiny
bones of the middle ear.

Gain or Loss: These are reciprocal numbers; they will be given in several ways.
Usually it is expressed as a ratio. It can be stated as ratio of the primary to
secondary impedances of an audio transformer.
This is given by gain or loss =
This voltage can also be expressed in dB as well.
It is given by the formula:
also voltages across the primary and secondary.

dB (decibel): A technique for expressing voltage,power, gain, loss, or frequency in
logarithmic form against a reference.Typical references include volts, watts or Hz.
DeciBels are calculated using the expression: Level in decibel L = 20 × log (x/y) or
L = 10 · log (x/y).

Voltage Controlled Attenuator (VCA):
Similar to a voltage controlled amplifier except that the amplifier will, with no control
voltage sent to it, have no gain and no loss; as an increasing control voltage is sent
to it, the amplifier reduces gain, causing an amplitude loss of signal strength.