EAW Loudspeaker's owner manual 8 . 2 . 1 I n p u t C o n n e c t i o n

8 . 2 A u d i o I n p u t C o n n e c t i o n s - P o w e r e d L o u d s p e a k e r s

8 . 2 . 1 I n p u t C o n n e c t i o n

The audio input connector will be a female XLR-3 or a type of terminal block connector. Where both male and female XLR-3 connectors are provided, the input connection can be made to either. Normally, the female connector is used for the input signal, with the male connector functioning as a loop through connector for routing the audio signal to additional loudspeakers.

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3

Connect the output from your signal source (mixing console, microphone, preamp, or other line-level source) to the input connector on the rear panel. This is an electronically balanced input designed to be connected to a balanced signal source, but may be connected to an unbalanced source. However, this WILL create a ground loop, possibly causing excessive noise. See Section 8.3.

Pin	Connection	1 2
		3

1Sheild

2signal plus or cold

3signal minus or hot

Typical XLR-3 Input and Loop Through Connectors

Terminal Block Connections:

The proper terminal block connector connections are labeled on the loudspeaker, normally as "+", "-", and a shield (ground) symbol, as shown.

A

B

Typical Terminal Block Style Connector and Shield Symbol

8 . 2 . 2 L o o p o r T h r u C o n n e c t o r :

Use this connector to "daisy-chain" the input signal to multiple loudspeakers. For terminal block connections, use multiple wires to each terminal for daisy-chaining.

UNBALANCED

OUTPUT

If the signal processing, including the crossover, is built in, full-range loudspeakers and subwoofers may be daisy-chained together from a single signal source.

BALANCED

INPUT

POWERED

SPEAKER

CABLE SHIELD

AC MAINS SAFETY GROUND

8 . 3 U n b a l a n c e d C o n n e c t i o n s

Connection to an unbalanced signal source will create a ground loop that can result in excessive noise (hum and buzz) in the system. The cause of ground loop noise can be difficult to determine, as sometimes it can even be related to the internal design of some equipment.

For unbalanced-to-balanced connection, use an interconnect cable wired as shown above. The important point is that the shield and the negative signal wire from the powered loudspeaker input are connected at the unbalanced output and usually left "floating" at the balanced input. This wiring scheme does not prevent a ground loop; it is simply the best way to directly wire the interconnection. The usual way to eliminate ground loop noise is by inserting an isolation transformer into the signal path.

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