MACKIE 18" Powered Subwoofer HD 1801 - Manual (Page 16)

Appendix B:
Connections
XLR Connectors
The HD1801 has two female XLR inputs that accept
balanced line-level signals. When connecting a balanced
signal, be sure it’s wired per AES (Audio Engineering
Society) standards:
XLR
Pin 1 – Shield (Ground)
Pin 2 – Hot (+)
Pin 3 – Cold (–)
There are also two male XLR connectors on the
HD1801 labeled full range. These are also wired
according to the AES standards listed above.
The full range connectors allow you to connect
several HD1801’s. Simply plug the signal source
(e.g., mixer output) into the HD1801 input jack, and
patch that subwoofer’s full range jack to the next
subwoofer’s input jack, and so on, daisy-chaining
multiple subwoofers.
There is a limit to how many you can
daisy-chain together. A general rule is to
maintain a load impedance ten times or
more than the source impedance to prevent
excessive loading on the source. For exam-
ple, if your mixer has an output impedance of 120 ohms,
then you can daisy chain up to nine HD1801s. This is
a load of 1222 ohms (HD1801 input impedance=11
kohms; 9 of these in parallel=1222 ohms). Since
microphones typically have a higher output impedance,
you should limit daisy-chaining from a mic source to two
HD1801s (assuming that loudspeakers are also con-
nected to the subwoofers).
Balanced XLR Connectors
Repair
For warranty service, refer to the warranty
information on page 19.
Non-warranty service for Mackie products is
available at a factory-authorized service center. To
locate the nearest service center, visit www.mackie.com,
click “Support” and select “Locate a Service Center.”
Service for Mackie products living outside the United
States can be obtained through local dealers or
distributors.
If you do not have access to our website, you may call
the Tech Support department at 1-800-898-3211,
Monday-Friday, during normal business hours, Pacific
Time, to explain the problem. Tech Support will tell you
where the nearest factory-authorized service center is
located in your area.
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HD1801
HD1801