Niles Audio Pro870FX User Manual

Page 9

4. Connect the other end of the loudspeaker

wires to the home theater receiver (or
amplifier) in the same way.

5. Turn on the home theater receiver and

calibrate all loudspeakers in the system
according to the receiver manufacturer’s
instructions.

CHECKING LOUDSPEAKER PHASE

Speaker wire has two conductors. On both your loudspeaker and ampliﬁer, one
conductor is attached to the negative (–) terminals, while the other is attached to
the positive (+) terminals. Usually, the wire is marked for your convenience, but the
marking can be done in the following different ways:

■

Stripe on one wire

■

Ribbed area you can feel on one conductor

■

Different colors of metal wire on each conductor

■

Fabric strand or string wound into one of the conductors

Of course, there are some wires that appear completely identical. So be careful, or
you might make a connection mistake. If you do, one loudspeaker will be playing
“out-of-phase” with the other loudspeaker. A pair of out-of-phase loudspeakers
works against each other, and the sound of the two playing together will be lacking
in bass and sound “phasey.” If you suspect the sound is not right, and you cannot
see any markings on the wire, try this simple test:

1. Stand halfway between the loudspeakers.

2. Play some music with the amplifier or radio set to Mono.

3. Listen to the richness of the bass and the loudness of the sound.

4. Turn off the amplifier and reverse the connections on one amplifier channel only.

5. Repeat the listening test with the same volume control setting. When the sound has a

richer bass and is slightly louder, the loudspeakers are working together or “in-phase.”

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Figure 5. Connecting loudspeaker

wires to the ProFX terminals.