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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 SR1521z's together off the
same signal source.
3. Level Control
This controls the overall signal level at the input to
the built-in power ampliers. 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 SR1521z has a built-in limiter that prevents the
amplier 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 ampliers and
heatsink. If the temperature should exceed a safe oper-
ating level, this indicator lights and the signal is muted to
allow the ampliers 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 SR1521z 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 SR1521z’s built-in power ampliers.
Plug the linecord into an AC socket properly congured
for your particular model.
SR1521
Z
ACTIVE SOUND REINFORCEMENT
SPEAKER SYSTEM