Mackie HD 1801 User Manual

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.

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.

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.

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.

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.

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).

Owner’

s Manual