PSB Speakers PSB SubSeries 500 Guide D'utilisation page 18

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See your dealer if you require service. PSB dealers are equipped to handle almost all
problems. If you have moved since your purchase, the nearest authorized PSB dealer
should be able to help you. You may locate your nearest PSB authorized dealer on-line
at www.psbspeakers.com. If the problem is not resolved, please contact us, providing
the Model name, Serial Number, date of purchase, dealer name, and a full description of
the problem.
We appreciate your purchase, and hope this owner's guide helps you enjoy the
exceptional satisfaction that PSB speaker systems have to offer. We wish you many
years of enjoyable listening!
wiring/appliances. Replace/shorten the low level cable
connecting the subwoofer to the source equipment (receiver or
processor). Low level cable runs of longer than 20 feet may
require the use of a line driver (not available from PSB).
Hum heard when using the subwoofer's high level input(s) is
usually caused by an intermittent or missing positive or negative
connection. Ensure there is a good connection between all
speaker wires connecting the subwoofer and receiver/amplifier.
If the subwoofer high level connection is routed through a switch
box, ensure the box shorts the positive and negative
connections together when the subwoofer should be inactive.
Hum will result if the switch box floats the positive or negative
connection.
Decreasing the volume control of the subwoofer and increasing
the volume control of the receiver/processor/amplifier subwoofer
output can sometimes reduce hum to an acceptable level.
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