JBL SYN 3 manual Troubleshooting

TROUBLESHOOTING

Symptom	Probable Cause	Solution
No sound coming	• Amplifier not turned on	• Turn on amplifier
from speaker	• Amplifier gain is low	• Make sure that there is
	• Correct source not	amplifier gain for that
	selected or turned on	channel
	• Defective patchcords to	• Select proper source
	amplifier	• Check/replace patch cords
	• Speaker wires not	• Check speaker wire
	connected to amplifier	connection to amplifier
Cinema drivers are not	• Loose din cables between	• Check that din cable is
turning on in cinema mode	speakers and power	connected between
	sequencer	speakers and power
	• Loose din cables between	sequencer
	power sequencer and	• Check that din cable is
	surround processor	connected between power
	• Defective din cables	sequencer and surround
	• Relays in speakers not	processor
	switching	• Check/replace din cables
Bass is very weak	• Subwoofers are wired out	• Make sure that positive
	of phase	terminals on the
	• Subwoofers have not	subwoofers go to the
	been placed optimally	positive terminals on the
		amplifiers (red) and do the
		same for the negatives
		• Experiment with different
		locations
Poor or smeared imaging	• Poor room acoustics	• Use absorptive materials
	• Poor program source	to minimize early
	• Improper polarity	reflections
		• Check another program
		source
		• Aim speakers at listening
		area, check polarity
Indistinct dialog	• Slap echoes	• Add absorption or
	• Miscalibration of center	diffusion materials
	channel output level	• Check output levels of
		surround processor
Uneven surround coverage	• Poor speaker placement,	• Place surrounds
	strong reflections	according to THX spec
	• Excessive absorption near	• Add absorption and/or
	surrounds	diffusion materials
		• Remove absorptive
		material to provide
		surround reflections

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