JBL CSA2120 2-Channel Installed Sound Power Amplifier - Manual (Page 9)

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2.3 Ensuring Proper Cooling
When using an equipment rack, mount units directly on top of each other. DO NOT
block side air vents. The back of the rack should be open.
2.4 Choosing Input Wire and Connectors
We recommend using pre-built or professionally wired balanced line (two-conductor
plus shield) 22-24 gauge cables to connect the amplifier balanced input by using
shipped two 3-pin Euroblock connectors, see Figure 2.4. Unbalanced lines may be
used, but may result in hum or RF noise very long cable runs.
You can also use RCA connectors to connect audio devices, for example, CD/DVD
player. However, do not use both Euroblock and RCA audio input connectors on a
single channel at the same time.
NOTE : Custom wiring should only be performed by qualified personnel.
Figure 2.4 Input Wiring
Note: Do not use both Euroblock and RCA audio input connectors on a single
channel at the same time.