NAD VISO SPEAKERS Owner's Manual page 16

Sounds distorted
Hum
Thank you again for your purchase. We hope this owner's guide helps you enjoy
the exceptional satisfaction that NAD VISO speaker systems have to offer. And
we wish you many years of enjoyable listening!
disconnect and connect the subwoofer input signal. If the subwoofer
power indicator color changes to green, the VISO receiver may not
be sending a signal to the subwoofer. Ensure the VISO receiver is
correctly configured to provide signal at the subwoofer output.
Lower volume if the subwoofer begins to sound distorted to
determine if playback at a lower level solves the problem. If a slight
reduction in level solves the problem, were you being realistic in your
subwoofer level setting? If the distorted sound remains at a low
level, the woofer may be damaged.
Hum is usually caused by using an inferior, damaged, exceptionally
long signal cable or cables routed near high current
wiring/appliances. Replace/shorten the cable connecting the
subwoofer to the VISO receiver. Cable runs of longer than 20 feet
may require the use of a line driver (not available from PSB).
Setting the volume switch of the subwoofer to 0dB and increasing
the volume control of the VISO receiver subwoofer output can
sometimes reduce hum to an acceptable level.
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