PYLE Audio PASW 15 - Manual (Page 4)

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a direct line-of-site between the sub and the audience. Optimal placement is
directly on the floor.
When using more than one loudspeaker, you have to account for
phase alignment. When the speakers are close together this is not usually an
issue. However, when they are far apart, the sound from one speaker may
reach the ear a fraction of a second before the other. This will cause certain
frequencies to cancel out, resulting in a hollow sound. To avoid this, you
may have to use a delay processor to align the sound from the speakers.
Although an active crossover is not required you may choose to use
one for maximum routing control and increased amplifier efficiency.
Troubleshooting
No Sound:
Check connections
Try a different speaker cable
Check levels on amplifier
Confirm amplifier is getting a signal (check signal LED, or use
headphone output)
Intermittent Output:
Check connections
Try a different speaker cable
Weak Bass:
Check the polarity of the speaker connection. It may be reversed.
Listen with headphones to confirm the amplifier is being sent a good
signal.
Distorted Sound:
Check if the amplifier is overdriven. If it is, you will have to turn the
level down.
Make sure you are not exceeding the RMS rating of your speaker.