Hafler GX2800CE - Manual (Page 16)

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The amplifier will operate with either a balanced or unbalanced signal source.
INPUT
The input jacks used on the GX2800 are dual function connectors which accept 1/4" TRS (Tip Ring Sleeve) or male XLR
plugs. The amplifier will operate with either a balanced or unbalanced signal, from earth ground or floated source equip-
ment. To determine if your equipment is earth grounded or floated, consult the owner’s manual or test with an ohmmeter.
The signal connections are as follows:
DAISY CHAIN OUTPUT
Proper cable wiring will be determined by the source equipment that is feeding signal to the amplifier.
EARTH GROUNDED SOURCE EQUIPMENT
Source Units with a 3-pin mains power cord will typically have the audio output ground connected to the earth-grounded
chassis. This can be verified with an ohmmeter by disconnecting the mains power cord from the AC outlet and checking for
continuity between the earth ground pin and the audio output ground. This test should be done with the equipment
installed in the complete system, including cables. If the audio output ground is connected to the earth ground pin, it is
earth grounded equipment.
Consult the following diagrams for examples of recommended wiring techniques:
Tip Ring Sleeve Tip Sleeve
sleeve shorts amplifier
— input to audio ground
1/4" Mono Unbalanced 1/4" TRS Balanced XLR Balanced
Operation
Shield
Chassis
Audio
Ground
XLR, 1/4" TRS Amplifier
SHIELDED TWISTED PAIR
GROUNDED,
BALANCED
SOURCE
shield connected at one end only
1
3
2
Shield
Chassis
Audio
Ground
XLR, 1/4" TRS Amplifier
SHIELDED TWISTED PAIR
GROUNDED,
UNBALANCED
SOURCE
shield connected at one end only
1
3
2
Shield
Float
Audio
Ground
XLR, 1/4" Mono Amplifier
1/4" Mono: sleeve shorts
— input to Audio Ground;
XLR: short pins 1 & 3 together
COAX OR TWISTED PAIR
GROUNDED,
UNBALANCED
SOURCE
2
3
1