Main input, Loop out, Level control – MACKIE SA1232Z User Manual

Page 4: Power on indicator, Signal present indicator, Limit indicator, Thermal indicator, Power switch, Ac receptacle, Rear panel description

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REAR PANEL DESCRIPTION

1. MAIN INPUT

This is a female XLR-type connector that

accepts a balanced line-level signal from a
mixing console or other signal source.

2. LOOP OUT

This is a male XLR-type connector that

produces exactly the same signal that is
connected to the MAIN INPUT jack. Use it to
daisy-chain several SA1232z's together off the
same signal source.

3. Level Control

This controls the overall signal level at the input to

the built-in power amplifiers. It ranges from –15 dB to
+5 dB of gain. The center detent is 0 dB (unity gain).

4. Power ON Indicator

When the POWER switch is turned on, and the

linecord is connected to an active AC power supply, this
indicator lights green to let you know that you’re ready
to rock and roll. The cool blue LED on the front of the
cabinet works in the same way.

5. SIGNAL Present Indicator

This LED illuminates whenever there is a signal pres-

ent at the MAIN INPUT connector on the rear panel.
It senses the signal just after the level control, so if
the level control is turned down, the SIGNAL Present
indicator turns off.

6. LIMIT Indicator

The SA1232z has a built-in limiter that prevents the

amplifier outputs from clipping or overdriving
the transducers. The LIMIT indicator lights
when the limiter is activated. It's okay for the
LIMIT indicator to blink occasionally, but if it
blinks frequently or lights continuously, turn
down the level control until the LIMIT indica-
tor only blinks occasionally.

7. THERMAL Indicator

There is also a thermal protection circuit that mon-

itors the internal temperature of the amplifiers and
heatsink. If the temperature should exceed a safe oper-
ating level, this indicator lights and the signal is muted to
allow the amplifiers to cool. When the temperature cools
to a safe level once again, the thermal protection circuit
deactivates and normal operation continues.

Note: Activation of the thermal protection circuit is

an indication that you should take steps to avoid con-
tinued thermal problems. See “Thermal Considerations”
on page 6.

8. POWER Switch

Use this switch to turn the SA1232z on and off. Make

sure the level control is turned down before you turn it
on.

9. AC Receptacle

This is where you connect the AC linecord to provide

AC power to the SA1232z’s built-in power amplifiers.
Plug the linecord into an AC socket properly configured
for your particular model.

SA1232

ACTIVE SOUND REINFORCEMENT

SPEAKER SYSTEM

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