HD1801

Appendix B: Connections

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.

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:

Balanced XLR Connectors

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 connected to the subwoofers).

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HD1801