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REAR PANEL DESCRIPTION
POWER Switch
Use this switch to turn the SWA1501 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 SWA1501’s
built-in power amplifiers. Plug the linecord
into an AC socket properly configured for
your particular model.
LIMIT Indicator
The SWA1501 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 SWA1501 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 continues.
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
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 SWA1501s 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 SWA1501 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
system. Depending on the placement of the
SWA1501 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.
THRU
(FULL RANGE OUTPUT)
LIMIT SIGNAL THERMAL POWER
HIGH PASS
(MID/HIGH FREQ)
OUTPUT
SUBWOOFER
CONTROL
FULL RANGE
INPUT
PARALLEL
120Hz
NORMAL
REV 180
PHASE
L
R
SUBWOOFER
LEVEL
NORMAL
IN OUT
L
R
ON
SWA1501
ACTIVE SUBWOOFER
CONCEIVED AND DESIGNED BY MACKIE DESIGNS INC, WOODINVILLE, WA, USA AND MACKIE EUROPE
• MADE IN ITALY • COPYRIGHT ©2000 • THE FOLLOWING ARE TRADEMARKS OR REGISTERED
TRADEMARKS OF MACKIE DESIGNS INC.: "MACKIE", AND THE "RUNNING MAN" FIGURE • PATENT PENDING
POWER
115V-AC FUSE AC125V-T6.3A