Mackie SRM1550 Owner's Manual page 7

Hookup Diagrams continued...
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subwoofer input
SRM1550 subwoofers may be daisy-chained via the male XLR connector labeled "FULL RANGE".
Simply plug the signal source (i.e., mixer output) into the first subwoofer's channel A input and patch
that subwoofer's channel A full range output to the next subwoofers's channel A input, and so on,
daisy-chaining multiple SRM1550 subwoofers. See above for a visual representation of daisy-chaining.
DL1608 Mixer
Daisy-Chaining Multiple SRM1550 Subwoofers
Main
Outs
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subwoofer input
Owner's Manual
7