QSC Audio ISA 500Ti Manual De Usuario

Each channel has a balanced XLR and terminal block input. The 
input impedance is 20k ohm balanced or 10k ohm unbalanced.

Balanced connections are recommended for less AC hum and 
interference, especially with long cable runs. Unbalanced con-
nections may be suitable for short cables. The signal's source 
impedance should be less than 600 ohms. If the DataPort is 
being used to provide input signals to the amplifier, do not 
connect input signals to the XLR or terminal block connectors. 

If unbalanced connection is necessary, connect the signal con-
ductor to the connector’s + pin and the shield to the ground 
pin. Connect a jumper between the ground pin and the - pin.

Direct Low Impedance Output connections are shown on the 
back of the chassis, to the right of the output terminals. Care-
fully note the polarity marks, which are arranged to make 
Bridge Mode connections easier.

Stereo and Parallel Mode- Connect each loudspeaker load 
to its own channel of the amplifier, as shown on the chassis 
label to the right of the terminals. The mode configuration 
switches, page 5, must be set for Stereo or Parallel mode.

Bridge Mode- Bridge mode configures the amplifier to drive 
a single, high power loudspeaker load. See page 5 to set the 
Bridge Mode switches. Connect the load as shown on label to 
the right of the terminals. Use the center two terminals 
labelled BRIDGE MONO. 4 ohms is the minimum impedance in 
bridged mode. Use Stereo or Parallel mode channels to drive 2 
ohm loads.