JBL CSA 2120Z Audio Amplifier (2 x 120W) - Manual (Page 14)

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2.3 Ensuring Proper Cooling
When using an equipment rack, keep a minimum space of 4 inches (10cm) from the
top surface of the unit. Close any open spaces in the rack with blank panels. DO
NOT block any air vents. The side walls of the rack should be a minimum of 2 inches
(5 cm) from the amplifier sides. The back of the rack should be open.
2.4 Choosing Input Wire and Connectors
We recommend using prebuilt or professionally wired balanced line (two-conductor
plus shield) 22-24 gauge cables to connect the amplifier balanced input by using the
included Euro-block 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 Euro-block and RCA audio input connectors on a
single channel at the same time.
NOTE : Custom wiring should only be performed by qualified personnel.
MONO SUM
AUDIO
SOURCE
AUDIO
SOURCE
Figure 2.4 Input Wiring
Note: Two RCA connectors are provided for summing left and right channels from a
stereo source. Do not use both Euro-block and RCA connectors concurrently for any
single input channel.