Rear Panel Description - Mackie SWA1801 User Manual

REAR PANEL DESCRIPTION

POWER Switch
Use this switch to turn the SWA1801 on
and off. Make sure the signal source's level
control is turned down before you turn it on.
AC Receptacle
This is where you connect the AC line-
cord to provide AC power to the SWA1801's
built-in power amplifiers. Plug the linecord
into an AC socket properly configured for
your particular model.
LIMIT Indicator
The SWA1801 has a built-in limiter that
prevents the amplifier outputs from
overdriving the transducers. The LIMIT indi-
cator lights when the limiter is activated.
It's okay for the LIMIT indicator to blink oc-
casionally, but if it blinks frequently or
lights continuously, turn down the level
control until the LIMIT indicator only blinks
occasionally.
SIGNAL Present Indicator
This LED illuminates whenever there is
a signal present at the FULL RANGE INPUT
connector on the rear panel.
THERMAL Indicator
The SWA1801 has a thermal protection
circuit that monitors the internal tempera-
ture of the amplifiers and heatsink. If the
internal temperature should exceed a safe
operating level, this indicator lights and the
signal is muted to allow the amplifier to cool.
When the temperature cools to a safe level
once again, the thermal protection circuit
deactivates and normal operation resumes.
Note: Activation of the thermal protection
circuit is an indication that you should take
steps to avoid continued thermal problems.
See "Thermal Considerations" on page 7.
POWER Indicator
When the POWER switch is turned on
and the linecord is connected to an active
4
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.
FULL RANGE INPUT
These are female XLR-type connectors
that accept a balanced line-level signal from
a mixing console or other signal source.
THRU (FULL RANGE OUTPUT)
These are male XLR-type connectors
that produce exactly the same signal that is
connected to the FULL RANGE INPUT jack.
Use it to daisy-chain several SWA1801s to-
gether off the same signal source.
HIGH PASS (MID/HIGH FREQ) OUTPUT
These are male XLR-type connectors
that produce the frequencies above 120Hz.
Connect these to a pair of full-range active
speakers or to an amplifer/passive speaker
combination. The SWA1801 reproduces the
frequencies below 120Hz.
SUBWOOFER LEVEL Control
This adjusts the subwoofer level. The
center detent position provides 15 dB of
headroom with a nominal +4 dBu input
signal. Use this as a starting point for set-
ting the balance between the subwoofer
and the main speakers.
PHASE
This switch reverses the polarity of the
subwoofer output. Depending on the place-
ment of the SWA1801 subwoofer relative to
the full-range speakers, you may get a better
low-frequency response in the room if you
reverse the polarity of the subwoofer's signal.
Experiment with this switch to determine
which position sounds best.
POWER
ON
SWA1801
ACTIVE SUBWOOFER
115V-AC FUSE AC125V-T6.3A
CONCEIVED AND DESIGNED BY MACKIE DESIGNS INC, WOODINVILLE, WA, USA AND MACKIE EUROPE
• MADE IN ITALY • COPYRIGHT ©2002 • THE FOLLOWING ARE TRADEMARKS OR REGISTERED
TRADEMARKS OF MACKIE DESIGNS INC.: "MACKIE", AND THE "RUNNING MAN" FIGURE • PATENT PENDING
LIMIT SIGNAL THERMAL POWER
PARALLEL
HIGH PASS
SUBWOOFER
THRU FULL RANGE
CONTROL (MID/HIGH FREQ)
(FULL RANGE OUTPUT) INPUT OUTPUT
120Hz
NORMAL
L L
SUBWOOFER
LEVEL
IN OUT
NORMAL
R R
REV 180
PHASE