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Issue: There is no sound from the speakers.
• Conrm the power cable is connected to the speaker and the POWER switch is set to the ON position.
• Make sure the POWER LED is illuminated on the front of the speaker.
• Make sure a signal source is connected to the speaker and that it is producing sound.
• Make sure the speaker's VOLUME control is not set to the full counter-clockwise (minimum) position.
Issue: The signal is distorted.
• Verify the speaker's INPUT SENSITIVITY switch is set to +4dBu. If the distortion persists, even with the
speaker's VOLUME control set low, inspect the gain stages throughout the system to determine which
circuit in the signal path is being overdriven.
Issue: The signal level is low.
• Ensure the speaker's VOLUME control is turned up.
• Try setting the speaker's INPUT SENSITIVITY switch to -10dBV.
Issue: The speaker or subwoofer sounds boomy.
• If using the 305P, 306P, or 308P MkII Studio Monitors without the LSR310S Studio Subwoofer, try lifting
one of the speakers off of the supporting surface to see if the boominess is lessened. If it is, the speaker
is likely resonating through the surface it is sitting upon. Try isolating the speakers using a third-party
speaker isolation product. Alternatively, try engaging the BOUNDERY EQ on the speakers. Try both the
-1.5dB and -3dB settings to determine which setting provides the most natural bass response.
• If using the LSR310S Studio Subwoofer, try locating the subwoofer in a different position in the room,
away from corners. Try placing the subwoofer at the listening position and walk around the room while
listening to the system. When you nd a practical position that provides the desired bass response, try
placing the subwoofer at that location.
If the above measures do not correct the problem, please contact JBL Professional Customer Service for
assistance.
Section 7: Troubleshooting
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