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The AMT5000 has a differential audio receiver IC with extremely high (95 dB) common-mode rejection. It accepts a standard Pro Audio balanced audio feed. A screw terminal block on the board allows connecting the audio +, -, and ground wires. The feed must be mono. Standard Pro Audio practice is to use a shielded twisted-pair cable. The two wires in the twisted pair connect to the + and – terminals and the shield connects to the ground terminal. The other end of the cable will typically terminate in an XLR or TRS plug to connect to your audio source.
Shielded twisted-pair audio cable is relatively expensive compared to unshielded CAT5, CAT5E, CAT6… Ethernet cable, but history shows that CAT5 cable works without problems. CAT5 has 4 twisted pairs. You can use one pair for the + and – audio connections, one pair for ground (both wires connected to ground on both ends), and one pair for the power. The remaining pair can be left unused or used for additional grounding.
Balanced feed has a couple of advantages for long runs. It will eliminate ground-loop problems and will reject noise and hum that may be induced over the long cable. The balanced audio input of the AMT5000 is protected against static discharge surges and induced RF.
There are no jumpers or switches on the AMT5000 for selecting the Pro Audio or Consumer Audio inputs. Just connect to one or the other.
Hope this helps. If not, ask away!