Hafler TRM12.1, TRM10.1 Input Switch, Unbalanced Input, Xlr Wiring Configurations, Balanced Input

INPUT SWITCH

The unbalanced input uses a conventional RCA phone jack. Move the input switch to RCA UNBALANCED to use this jack. The balanced input jack is an XLR plug. The XLR jack is connected according to the IEC and AES standard. Move the input switch to XLR BALANCED to use this jack.

Unbalanced Input

Move input switch to RCA UNBALANCED to use RCA connectors

XLR WIRING CONFIGURATIONS

Balanced Input

Move input switch to XLR BALANCED to use the XLR connectors

Using the XLR Balanced Input is recommended for installations where long cable runs are used or when the potential for stray electromagnetic fields from other wires exists. There are balanced and unbalanced methods in which the XLR inputs can be used. The first method is an XLR Balanced Input using 3-conductor cable with signal carried on the first and second conduc- tors, equal in amplitude and opposite in phase, and the third conductor being a ground "drain". In this configuration, noise common on both phases of the signal is effectively "canceled" out. The second method is an XLR Unbalanced Input using 2- conductor cable with the signal carried in the center conductor and the ground carried on the shield. Many popular mixers use unbalanced outputs and can be used with the XLR Balanced Input. However, in this type of configuration we recommend using twisted pair cable or short cable lengths to prevent residual ground noise.

XLR Balanced Input

Check output from source for proper signal polarity

INPUTFROM

SOURCE

Pin 1 = GND

Pin 2 = (+)

Pin 3 = (–)

XLR Unbalanced Input

Connect (–) and GND (shield) terminals at both ends of

cable to prevent unstable amplifier operation

INPUTFROM

SOURCE

Pin 1 = GND

Pin 2 = (+)

Pin 3 = GND

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