Mackie SRM1801 Bedienungsanleitung PDF herunterladen (Seite 15)

Appendix B:

Connections

XLR Connectors

The SRM1801 has two female XLR input jacks 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 (–)

You should use high-quality, shielded cable to

connect the signal source to the INPUT jacks on the

SRM1801.

• Highqualitymicrophonecablesworkwell.

• Foilshieldedcablesarecommonlyusedforaudio

wiring.

• Thebettertheshield,thebettertheimmunity

from externally induced noise (like EMI and

RFI). Route the cable away from AC power cords

and outlets. These are common sources for hum

in an audio signal. You can purchase quality

cables from your Mackie dealer.

There are also two male XLR connectors on the

SRM1801 labeled FULL RANGE and two labled HIGH

PASS. These are also wired according to the AES

standards listed above.

The FULL RANGE connectors allow you to connect

several SRM1801’s. Simply plug the signal source

(e.g., mixer output) into the SRM1801 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 example, if

your mixer has an output impedance of 120 ohms, then

you can daisy chain up to nine SRM1801’s. This is a load

of 1222 ohms (SRM1801 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 SRM1801’s

(assuming that loudspeakers are also connected to the

subwoofers).

Balanced XLR Connectors

1 2 ... 10 11 12 13 14 15 16 17 18 19

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