MACKIE 18" Powered Subwoofer HD 1801 - Manual (Page 9)

3. INPUTS
These female XLR connectors accept balanced
line-level signals from a mixing console or other signal
source.
If you are connecting a single subwoofer output, or
LFE (low-frequency effects) output to the subwoofer,
you may use either the A or B input connector.
CAUTION: NEVER connect the output of an
amplifier directly to the input of the
subwoofer. This could damage the input
circuitry of the powered subwoofer.
4. HIGH PASS OUTPUTS
Balanced XLR male connectors are provided for the
line-level A and B high-pass outputs. The subwoofer’s
internal active crossover splits the input signals into
two frequency bands. The low frequency range below
100 Hz goes to the internal amplifier that powers the
subwoofer. The frequency range above 100 Hz is sent to
these line-level output jacks.
Connect these outputs to the inputs of your main
powered loudspeakers, or to the inputs of the amplifier
powering the main loudspeakers. In this way, the main
loudspeakers will play the range above 100 Hz. If the
main loudspeakers have good low-frequency response,
then you may decide to use the full-range outputs (5)
instead.
The level control and polarity switch have no effect
on the high-pass outputs. The outputs are separate and
maintain the stereo separation of the input signals.
5. FULL RANGE OUTPUTS
Balanced XLR male connectors are provided for the
line-level A and B full-range outputs. Connect these
outputs to the inputs of another powered subwoofer,
main powered loudspeakers, or to an amplifier powering
passive loudspeakers.
The signal at these outputs is a direct copy of the
input signals. These outputs allow you to daisy-chain
multiple subwoofers, and/or send the full-range signals
to the main loudspeakers.
The level control and polarity switch have no effect
on the full-range outputs. The outputs are separate and
maintain the stereo separation of the input signals.
6. POLARITY INVERT
Press this switch in to invert subwoofer polarity.
Depending on the placement of the HD1801 subwoofer
relative to the full-range speakers, you may get a better
low-frequency response if you invert the polarity of the
subwoofer’s signal. See page 11 for more information.
7. POWER LIGHT ON
Press this switch in to turn on the front panel power
LED if a visual indicator is preferred. The LED next to
the switch will light as a reminder.
If this switch is out, and the HD1801 is turned on, the
LED on the front of the cabinet will not light, nor will
the LED next to the switch.
8. LEVEL
This controls the overall signal level at the input to
the built-in power amplifier. It ranges from –6 dB to
+6 dB of gain. The center detent is 0 dB (unity gain).
This control has no effect on the level of the High
Pass Outputs (4) or the Full Range Outputs (5).
POWER
18 -INCH HIGH DEFINITION POWERED SUBWOOFER
ON
REVISION SERIAL NUMBER
WARNING:
TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR
MOISTURE. DO NOT REMOVE COVER. NO USER SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED PERSONNEL.
AVIS: RISQUE DE CHOC ELECTRIQUE — NE PAS OUVRIR
SETTINGS
POWER
LIGHT ON
SIG/ LIMIT
THERMAL
LEVEL
POLARITY
INVERT
FULL RANGE
HIGH PASS
OUTPUTS
A B
A B A B
INPUTS
+ 6dB 6dB -
HD1801
4
5
6
7
10
3
9
8
9
Owner’s Manual
Owner’
s Manual