Troubleshooting | JBL S4VC, S4HC, S4Ai, S4HC &S4Ai specification

TROUBLESHOOTING

SYMPTOM	PROBABLE CAUSE	SOLUTION

Bass is very weak	• Subwoofers are wired out	•Make sure that positive terminals on the
	of phase	subwoofers go to the positive terminals
		on the amplifiers (red) and do the same
		for the negatives.
	• Subwoofers have not	•Experiment with different locations.
	been placed optimally

Poor or smeared imaging	• Poor room acoustics	•Use absorptive materials to minimize
		early reflections.
		•Aim speakers at listening area.
	• Poor program source	•Check another program source.
	• Improper polarity	•Check polarity of wire connections.

Indistinct dialogue	• Slap echoes	•Add absorption or diffusion materials.
	• Miscalibration of center	•Check output levels of surround processor.
	channel output level

Uneven surround coverage	• Poor speaker placement,	•Place surrounds according to THX
	strong reflections	specifications.
		•Add absorption and/or diffusion materials.
	• Excessive absorption near	•Remove absorptive material to provide
	surrounds	surround reflections.

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JBL S4VC, S4HC, S4Ai, S4HC &S4Ai manual Troubleshooting

Contents

S4VC, S4HC & S4Ai Contents Introduction Included Speaker Placement Center Channel Speakers Placement of the surround speakers remains critical Channel Systems S4Ai Wiring Guide S4Ai Modes of Operation Bipole Mode is Typically Used When Room is highly reflective Side Left OUT position see . SeeTable on the right side Rear Left Face see . To flush-mount the grille to the wall Mounting the SpeakersCenter studs. For horizontal mounting, cross-bracing is SPEAKER-MOUNTING Options Mounting the S4VC speaker using the S4PCB kit Requirements for Mounting Mounting S4VC speaker using the S4RFB kit Connecting the Speakers to the Rest of Your System Preparing the Hookup Wire Acoustical Problems in Listening Rooms FINE-TUNING Your Audio SystemRoom Reflections Materials can be found with a small See FigureHowever, since it is not possible to Excessive USE of Absorptive Materials Room Absorption for Home Theater Systems Slap Echoes Rattles Piece of cloth can be placed under offending knickknacksBackground Noise BACKGROUND-NOISE Solutions Standing Waves STANDING-WAVE Solutions Absorption STANDING-WAVE Solutions Room RatiosSTANDING-WAVE Solutions Speaker Placement An even distribution of them, so that their STANDING-WAVE Solutions Room Equalization Troubleshooting Troubleshooting Specifications S4VC S4HC JBL Consumer Products Crossways Park Drive Woodbury, NY