QSC PLX1104 Manuel d'utilisateur télécharger pdf (Page 7)

Inputs

Each channel has a balanced XLR (female) and 1/4-inch TRS input. The XLR and TRS

connectors for each channel are wired in parallel and can be used for “daisy chain-

ing” an input signal to additional amplifiers.

The input impedance is 20k ohm balanced or 10k ohm unbalanced. Both XLR and TRS

inputs are connected with standard cables and can be changed quickly. Pinouts are

marked on the rear panel. Do not attempt to connect more than one input signal to a

given channel.

Balanced connections are recommended to reduce AC hum and interference, espe-

cially with long cable runs. Unbalanced connections may be suitable for short cables.

The signal's source impedance should be less than 600 ohms.

Input Pinouts

Balanced inputs: Connect to the plug as shown.

XLR

TRS

Unbalanced inputs: Connect to the plug as shown. If using an XLR connector, Pin 3

and pin 1 must be connected with a jumper as shown. If using a TRS connector, the

ring and sleeve must be connected with a jumper. If a TS connector is used, the

sleeve will provide the “jumper” when inserted into the input jack.

XLR

TRS

Input connectors and pinout

chart (PLX1802 shown)

Input signal

TRS to TRS jumper from

Channel 1 to Channel 2

PLX 1104 and PLX 1804 models can parallel the input

signal to both channels by using a jumper from one

channel to the next:

•Connect the input signal to either of Channel 1’s

input connectors.

•Connect a jumper from Channel 1’s unused con-

nector to either of Channel 2’s input connectors.

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QSC PLX1104 Manuel d'utilisateur Page 7