Some balanced lines use 4-conductor star quad cable to provide immunity to magnetic fields.
2.
The entire place is covered by Mogami quad cabling as well as terminated Neutrick connections for all panels.
3.
Star-quad cable typically provides a 10 dB to 30 dB reduction in magnetically-induced interference.
4.
Star quad cables often use filler elements to hold the conductor centers in a symmetric four-point arrangement about the cable axis.
5.
The increased capacitance of the star quad cable is not usually a problem with short cable runs, but it can be an issue for long cable runs.
6.
Star-quad cable can be used for two circuits, such as four-wire telephony and other telecommunications applications, but it will not provide magnetic immunity in this application.
7.
For example, an 8 m ( 25 ft ) star-quad cable has a capacitance of 150 pF / m for a total capacitance of 1200 pF for the entire length of cable.
8.
The magnetic immunity of star quad cable is a function of the accuracy of the star-quad geometry, the accuracy of the impedance balancing, and the common-mode rejection ratio of the balanced receiver.
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