Thump18S Subwoofer: Rear Panel Features; Power Connection; Power Switch; Power Led - Mackie Thump 18S Owner's Manual

Thump18S Subwoofer: Rear Panel Features

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1. Power Connection

This is a standard 3-prong IEC power connector.
Connect the detachable power cord (included in
the packaging with the subwoofer) to the power
receptacle, and plug the other end of the power
cord into an AC outlet.
Make sure that the AC power is matched to
the AC power indicated on the rear panel
(below the IEC receptacle).
Disconnecting the plug's ground pin is
dangerous. Don't do it!

2. Power Switch

Press the top of this rocker switch inwards to turn on
the subwoofer. Press the bottom of this rocker switch
inwards to turn off the subwoofer.
As a general guide, the mixer (or other signal
source) should be turned on first, Thump18S
subwoofers next, and loudspeakers last.
As such, the loudspeakers should also be turned off first,
followed by the subwoofers, then the mixer. This will
reduce the possibility of any turn-on or turn-off thumps
and other noises generated by any upstream equipment
from coming out of the speakers.
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3. Power LED

When the power switch is turned on – and the power
cord is connected to an active AC mains supply – this
LED illuminates green to indicate that the subwoofer is
indeed really on. The cool green LED on the front of the
subwoofer works the same way.

4. XLR Inputs

Balanced XLR female connectors are provided for the
left and right inputs. Connect the full-range line-level
signal from the mixer (or other signal source) to these
input jacks.
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.
NEVER connect the output of an amplifier
directly to the input of the subwoofer.
This could damage the input circuitry of the
active subwoofer.
They are wired as follows, according to standards
specified by the AES (Audio Engineering Society):
Balanced XLR Input Connector
Pin 1 – Shield (ground)
Pin 2 – Positive (+ or hot)
Pin 3 – Negative (– or cold)
Balanced XLR Input Connector
For more information on these connectors, see
Appendix B on page 15.
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SHIELD
HOT
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COLD
SHIELD
1
3
COLD
2
HOT
Owner's Manual
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