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BALANCED AUDIO SYSTEMS

 

We're going to talk about balanced and unbalanced audio systems.

Every professional sound system needs to use balanced imputs and outputs here's why unbalanced system uses
the two conductor cable there is a center conductor which carries the signal and an outer shield which is grounded this shield provides the return path or zero reference for the signal and also provide some protection against low
frequency and radio interference.

The noise protection provided by an on ballots system is quite minimal it is only marginally safe to run a distance up to fifteen or
twenty feet especially with low-level signals such as a microphone or electric guitar 

 

A balanced system on the other hand has two wires for the signal the signal is sent 180 degrees out of phase between the two wires it still uses a grounded shield to protect against low frequency and radio
interference but the shield wire in this case has nothing to do with the signal here's a drying up how signal and noise is handled in each of these cases unbalanced system

Is very simple it consists of a signal source with the single out but reference to ground the signal comes from the
output if the source through the center conductor of the wire to the input have the receiving amplifier the foil are braid shield around the wire provides the return path for the signal and also protects the center conductor to some extent
from electrical and radio interference although the source signal might start out clean he picks up interference or noises along the wire this is because the wire is acting as an antenna by the time the signal reaches the amplifier
the noise has been added to it the resulting output from the amplifier consists of the signal plus the noise this noise might be so small that it can hardly be heard about the signal

It could also be so large that you can't hear the signal because the noise rounds it out often it somewhere in between a balanced system is a little more complicated instead of a single conductor plus a shield between
the signal source in the amplifier there are two conductors plus shield one conductor carries the main signal while

the other conductor carries the

inverse at the same signal a 180 degrees out of phase

the two together are referred to as a differential signal

This differential signal is passed through the wires the pick up the same noises the and balanced signal does by the time it reaches the amplifier both the positive and negative signals have the same noise added to them
keep in mind however that although the two signals are 180 degrees out of phase with each other the noises in phase these wires are connected to a differential amplifier which subtracts the out of a signal from the in face signal
the signals are referred to as minus a and a respectively when they're processed by the amplifier the output is equal to a minus minus a which equals to a because the noise on the two lines as in phase is subtracted from itself
and thus cancels itself out the equation for this is the amplifier output equals a plus noise minus minus a place nice which equals a plus noise plus a minus noise which equals to a this means that the signal has doubled
and the noise has cancelled out  for this reason all sound systems need to be balanced

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