D.A.S. AERO-20A User Manual
Also see for AERO-20.120A: Rigging manual
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16ANNEX I: Line connections: unbalanced and balancedThere are two basic ways to transport an audio signal with microphone or line level:Unbalanced line: Utilising a two conductor cable, it transports the signal as the voltage between them.Electromagnetic interference can get added to the signal as undesired noise. Connectors that carryunbalanced signals have two pins, such as RCA (Phono) and ¼” (6.35mm, often referred to as jack) mono. 3pin connector such as XLR (Cannon) may also carry unbalanced signals if one of the pins is unused.Balanced line: Utilising a three conductor cable, one of them acts as a shield against electromagneticnoise and is the ground conductor. The other two have the same voltage with respect to the groundconductor but with opposite signs. The noise that cannot be rejected by the shield affects both signalconductors in the same way. At the device’s input the two signals get summed with opposite sign, so thatnoise is cancelled out while the programme signal doubles in level. Most professional audio devices usebalanced inputs and outputs. Connectors that can carry balanced signal have three pins, such as XLR(Cannon) and ¼” (6.35mm) stereo.The graphs that follow show the recommended connection with different types of connectors to balancedprocessor or amplifier inputs. The connectors on the left-hand side come from a signal source, and the oneson the right hand side go to the inputs of the processor or amplifier. Note that on the unbalanced connectorson the left-hand side, two terminals are joined inside the connector. If hum occurs with balanced to balancedconnections, try disconnecting the sleeve (ground) on the input connector. Note that the illustrations showwhat should be connected to what, but that pin locations on an actual XLR connector are different. Also, pin2 hot is assumed on XLR connectors.Manual del Usuario / aero series / User’s Manual |
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