To Next PageTo Next PageWhat to do if there is no sound from JBL S412P?
If you're experiencing a complete lack of sound from your JBL speakers, ensure that your receiver or amplifier is powered on and a source is actively playing. Also, review the proper operation of your receiver/amplifier to ensure it's correctly set up.
Why is there no bass output from my JBL S412P?
If you're experiencing a lack of bass output from your JBL speakers, make sure the polarities (+ and –) of the left and right “Speaker Inputs” are connected properly. Also, ensure that the speaker is plugged into an active electrical outlet and switched on, and that the green LEDs are displayed.
How to fix JBL S412P when bass level decreases instead of increasing?
If the bass level decreases instead of increasing on your JBL speakers, recheck to ensure that your receiver or amplifier-speaker outputs are correctly connected to the speaker inputs (gold-plated binding posts), (+) to (+) and (–) to (–). Make sure that the speaker is plugged into an active electrical outlet. Review proper operation of your receiver/amplifier. Make sure all wires are connected. Check that your receiver or amplifier is on and that a source is playing. If you do this and the speakers function properly (bass increases as you turn your LFE/Subwoofer level-control knobs clockwise), your receiver/amp uses inverting inputs. This is not a problem. Simply connect all of the speakers in your system the same way.
Covers warnings about electric shock, not opening the unit, and general safety instructions.
Details on safe product placement, moisture avoidance, ventilation, and avoiding overloading.
Instructions for protecting the product during lightning storms and from power line surges.
Guidance on arranging speakers for the most realistic soundstage and stereo imaging.
Instructions for attaching adhesive pads to the speaker feet for floor placement.
Ensures correct connection polarity for optimal sound quality and stereo imaging.
Details on connecting the S412P speakers to receiver/amplifier speaker outputs.
Explains how to connect the LFE/Subwoofer input for enhanced low-frequency effects.
How to adjust the volume of the low-frequency effects channel.
Settings for receiver speaker size and subwoofer output for optimal performance.
Explanation of the main power switch and the auto-sensing standby mode.
Understanding the meaning of the front panel LEDs and how to control them.
Diagnosing problems when no sound or only sound from one speaker is present.
Addressing issues where the system shuts off at higher volumes or has low bass.
Troubleshooting no sound from the subwoofer or reversed bass response.
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