High Pass Outputs; Full Range Outputs - Mackie Thump 18S Owner's Manual

Thump18S Subwoofer: Rear Panel Features continued...

5. High Pass Outputs

Typically, full-range loudspeakers are connected
to the high pass outputs to "split" the work with the
Thump18S subwoofer. The subwoofer handles all of the
low frequencies and the loudspeakers handle the rest.
As a result, it is more efficient and a bit louder.
Balanced XLR male connectors are provided for the
line-level A and B high pass outputs. The subwoofer's
crossover splits the input signals into two frequency
bands. The low frequency range below 140 Hz goes to
the internal amplifier that powers the subwoofer. The
frequency range above 140 Hz is sent to these line-level
output jacks.
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.
They are wired as follows, according to standards
specified by the AES (Audio Engineering Society):
Balanced XLR Output Connector
Pin 1 – Shield (ground)
Pin 2 – Positive (+ or hot)
Pin 3 – Negative (– or cold)
Balanced XLR Output Connector
10
Thump18S Powered Subwoofer
8 7
5 6
SHIELD 1
3
2
COLD
HOT
SHIELD
1
3 COLD
2
HOT

6. Full Range Outputs

Connect the full range outputs to the inputs of
another powered subwoofer, powered loudspeakers,
or to an amplifier powering passive loudspeakers.
Balanced XLR male connectors are provided for the
line-level A and B full range outputs.
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 loudspeakers. It's a great way to add side fills, too!
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.
They are wired as follows, according to standards
specified by the AES (Audio Engineering Society):
Balanced XLR Output Connector
Pin 1 – Shield (ground)
Pin 2 – Positive (+ or hot)
Pin 3 – Negative (– or cold)
Balanced XLR Output Connector
See page 7 to learn more about daisy-chaining
Thump18S subwoofers.
For more information on these connectors, see
Appendix B on page 15.
1
SHIELD
3
COLD 2
HOT
SHIELD
1
3 COLD
2
HOT