Any noise picked up along the cable run will typically be common to both legs.
Balanced line cable length.
A balanced cable by contrast has three conductors in the connector and three wires in the cable.
Very low levels mic phono are much more susceptible to interference than line levels.
High levels speaker cable are rarely balanced.
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That said when the cord length is under 10 feet unbalanced cables actually have a stronger signal than balanced cables.
Both legs carry the same signal but in opposite polarity to each other.
The cable construction used for balanced telephone cables was twisted pair.
As in the unbalanced cable the ground wire still surrounds the signal wires and is used as a shield against interference.
With balanced cables you don t get the same distortions so they can be much longer without any detriment to your sound quality.
4 what levels are you transmitting.
A ground a positive leg and a negative leg.
Open wires on the other hand with their lower capacitance had been used for.
For an unamplified telephone line a twisted pair cable could only manage a maximum distance of 30 km.
Two signals wires plus a separate ground wire.
However this did not become widespread until repeater amplifiers became available.
As a general rule this effect is only noticeable with cables beyond 20 feet in length.