JBL L8400P/230 Owner's Manual

Also see for Studio L8400P/230: Owner's guide Operator's guide

Contents

TROUBLESHOOTINGIf you used the high-level(speaker) inputs and thereis no sound from any of thespeakers:• Check that the receiver/amplifier is on and a sourceis playing.• Check that the poweredsubwoofer is plugged intoan active electrical outletand is switched on.• Check all wires and connec-tions between the receiver/amplifier and the speakers.Make sure all wires are con-nected. Make sure none ofthe speaker wires are frayed,cut or punctured, or touchingeach other.• Review proper operationof your receiver/amplifier.If there is low (or no) bassoutput:• Make sure the connectionsto the left and right “SpeakerInputs” have the correctpolarity (+ and –).• Make sure that the sub-woofer is plugged into anactive electrical outlet andswitched on.• Adjust the crossover point.• Flip the Phase Control switchto the opposite position.• If you are using a DolbyDigital/DTS receiver orprocessor, make sure that thesubwoofer and bass manage-ment adjustments on thereceiver/processor are set upcorrectly.• Slowly turn the Level Controlclockwise until you begin tohear the desired amount ofbass.If you used the line-levelinputs and there is no soundfrom the subwoofer:• Check that the receiver/amplifier is on and a source isplaying.• Check that the poweredsubwoofer is plugged into anactive electrical outlet and isswitched on.• Check all wires andconnections between thereceiver/amplifier and thesubwoofer. Make sure allwires are connected. Makesure none of the wires arefrayed, cut or punctured, ortouching each other.• Review proper operation ofyour receiver/amplifier.• Slowly turn the LevelControl clockwise until youbegin to hear the desiredamount of bass.• Make sure that you haveconfigured your receiver/processor so that the sub-woofer/LFE output is on.Phase ControlThe Phase Control § deter-mines whether the sub-woofer’s pistonlike actionmoves in and out in phasewith the main speakers oropposite the main speakers.There is no correct or incor-rect setting. Proper phaseadjustment depends on sev-eral variables such as sub-woofer placement and lis-tener position. Adjust thePhase switch to maximizebass output at the listeningposition.Remember, every system,room and listener is different.There are no right or wrongsettings; this switch offers theadded flexibility to adjust yoursubwoofer for optimum per-formance for your specificlistening conditions withouthaving to move your speakers.If at some time in the futureyou happen to rearrange yourlistening room and move yourspeakers, you should experi-ment with the Phase switch inboth positions, and leave it inthe position that maximizesbass performance.7

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