JBL CSA2120 2-Channel Installed Sound Power Amplifier - Manual (Page 11)

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2.6 Wiring Your Audio System
Typical input and output wirings are shown in Figure 2.6.
INPUTS: Connect input wiring for both channels using either the RCA or the
Euroblock input for each channel.
OUTPUTS: Maintain proper polarity (+/–) on output connectors.
Connect Channel 1 loudspeaker’s positive (+) lead to Channel 1 positive (+) terminal
of amp; repeat for negative (–). Repeat Channel 2 wiring as for Channel 1.
The minimum impedance one of the amplifier channels can drive is 4 Ohms.
Therefore, you can connect up to four 16 Ohms speakers, or two 8 Ohms speakers,
or one 4 Ohms speaker to each amp channel.
Figure 2.6 Wiring Audio System
Professional
audio system
Personal audio
system