Proficient Protege F5 Series Owner's Manual page 9

Hum (Continued)
• Ground-loop isolators are also available for audio lines and video. Once you have identified which
components are causing a problem, you can connect the isolators between the component and the
receiver.
No Auto Turn off
• The subwoofer should turn itself off after approximately fifteen minutes with no audio signal present. If not,
check if there is no background hum. The subwoofer may sense hum as a small signal and stay on. See the
above hints to eliminate the hum.
No Auto Turn On
• Check that the subwoofer power switch is on.
• Check that a signal is being received from your receiver.
• Check the input connections.
• Check the mode switch or menu on surround systems to be certain that a bass signal is being sent to
the subwoofer. Please refer to Diagram 3 on Page 6.
Sub Turns On, No Output
• The sub's volume control may be turned down.
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