8 – CXA240
1/4" TRS Phone Plugs and Jacks
“TRS” stands for Tip-Ring-Sleeve, the three connections
available on a stereo 1/4" or balanced phone jack or plug.
TRS jacks and plugs are used for balanced signals and
stereo headphones.
1/4" TRS Balanced wiring
Sleeve = Shield
Tip = Hot (+)
Ring = Cold (–)
1/4" TS Phone Plugs and Jacks
“TS” stands for Tip-Sleeve (famous Olympic hurdler), the
two connections available on a mono 1/4" phone jack or
plug. They are used for unbalanced signals.
1/4" TS Unbalanced Wiring
Sleeve = Shield
Tip = Hot (+)
RCA Plugs and Jacks
RCA-type plugs (also known as phono plugs) and jacks
are often used in home stereo and video equipment and
in many other applications. They are unbalanced and
electrically equivalent to a 1/4" TS phone plug.
RCA Unbalanced Wiring
Sleeve = Shield
Tip = Hot (+)
5. THERMAL CONSIDERATIONS
The power amplier within the unit is fan cooled. Heat is
drawn away from the amplier heatsink by the fan and
exhausted through the cooling vents in the top cover.
When installing, be sure to allow sufcient air space
around the top and rear of the amplier to allow
adequate cooling for the heatsink. Leave at least one
rack space above and below, and at least 6 inches behind
the chassis to allow proper ventilation.
If the amplier should overheat, a thermal switch turns
off the power amplier, allowing the heatsink to cool
down. Once the amplier has cooled to a safe operating
temperature, the thermal switch resets and reactivates
the amplier. If this should occur, identify the cause of the
problem and take corrective action. For example:
• Provide better ventilation
• Install a fan in the rack to move more air
• Make sure the amplier is not overloaded with too
low of a load impedance or by a short circuit on the
speaker line
RACK MOUNTING
The front panel has rack mount holes provided to allow the
unit to be tted within a standard 19" rack.
The unit still needs to be supported underneath, due to the
weight of the power and output transformers.
6. CONNECTIONS
Here are some common audio connectors and their internal
wiring.
XLR Connectors
XLR connectors are commonly wired as follows (according
to standards specied by the Audio Engineering Society):
XLR Balanced Wiring
Pin 1 = Shield
Pin 2 = Hot (+)
Pin 3 = Cold (–)
2
2
3
1
1
SHIELD
COLD
HO
T
SHIELD
COLD
HO
T
3
SHIELD
COLD
HOT
3
2
1
SLEEVE
TIP
TIP
SLEEVE
TIP
SLEEVE
SLEEVE
TIP
SLEEVE
TIP
RING
RING
TIP
SLEEVERING
(16 pages)
(40 pages)
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