JBL S412PII manual Troubleshooting, Bass Clockwise, Output, Subwoofer

T R O U B L E S H O O T I N G

If there is no sound from any of the speakers:

•Check that receiver/amplifier is on and that a source is playing.

•Review proper operation of your receiver/amplifier.

If there is no sound coming from one speaker:

•Check the “Balance” control on your receiver/amplifier.

•Check all wires and connec- tions between receiver/ amplifier and speakers.

•Make sure all wires are connected. Make sure none of the speaker wires are frayed, cut or punctured.

•Make sure no wires are touching other wires or terminals and creating a short circuit.

•Turn off all electronics and switch the speaker in question with one of the other speakers that is working correctly. Turn everything back on, and determine whether the problem is in the same place, i.e., the speaker that was working previously now has no sound and the speaker that was not working now sounds fine; or whether it has moved, i.e., the speaker that was not working still has no sound and the speaker that was working is still fine. If the problem is in the same place, the source of the problem is most likely with your receiver or amplifier, and you should consult the owner’s manual for that product for further information. If the problem has followed the speaker, consult your dealer for further assistance or, if that is not possible, visit our Web site at www.jbl.com for further information.

If the system plays at low volumes but shuts off as volume is increased:

•Check all wires and connec-

tions between receiver/		• In Dolby Digital or DTS mode,
amplifier and speakers.		make sure your receiver/
• Make sure all wires are		processor is configured so that
connected. Make sure none of		the subwoofer and LFE output
the speaker wires are frayed,		are enabled.
cut or punctured.
• If more than one pair of		If you are using the S412PII
main speakers is being used,		LFE/Subwoofer input and the
check the minimum	impedance	bass level decreases (instead
requirements of your	receiver/	of increasing) when you turn
amplifier.		the LFE/Subwoofer Level knob
If there is no (or low)	bass	clockwise:
		• Recheck to make sure that
output:
		your receiver or amplifier-
• Make sure the polarities
		speaker outputs are correctly
(+ and –) of the left and right
		connected to the S412PII
“Speaker Inputs” are
		speaker inputs (gold-plated
connected properly.
		binding posts), (+) to (+) and (–)
• Make sure that the speaker
		to (–). The S412PII (+) terminal
is plugged into an active
		has a red stripe and is located on
electrical outlet and switched
		the right-hand side, below the
on, and that the green LEDs are
		letter “L” of the molded JBL logo,
displayed.
		when looking directly at the back
• In Dolby Digital or DTS mode,
		of the S412PII.
make sure your receiver/		• If the wires are connected
processor is configured so that
		properly, the confusion may be
the subwoofer and LFE output
		attributable to the design of your
are enabled.
		receiver/amplifier. Your unit may
If you used the LFE input and		have inverting inputs, which
		reverse the polarity of the signal
there is no sound from the
		between the inputs and outputs
subwoofer:
		of the amplifier. To check if this is
• Check that receiver/amplifier
		the case, reverse the speaker
is on and that a source is
		connections for ALL S412PII’s in
playing.
		your system (and disconnect any
• Make sure that the speaker
		other speakers in the system)
is plugged into an active
		so	that the receiver/amplifier	’s
electrical outlet and switched
		(+)	connector is connected	to
on, and that the green LEDs are
		each S412PII’s (–) (black stripe)
displayed.
		speaker connector. If you do
• Check all wires and connec-
		this and the S412PII’s function
tions between receiver/
		properly (bass increases as you
amplifier and speakers.
		turn your LFE/Subwoofer level-
• Make sure all wires are
		control knobs clockwise), your
connected. Review the “Line-
		receiver/amp uses inverting
Level Connections” section on
		inputs. This is not a problem.
page 5 of this manual and make
		Simply connect all of the
sure that a single RCA patch
		speakers in your system the
cord is connected to each
		same way, with the receiver or
loudspeaker from the
		amplifier’s (+) terminal to the
Y-Connector plugged into the
		speaker’s (–) terminal, and the
receiver/amplifier’s subwoofer
		receiver or amplifier’s (–)
output. Make sure none of the
		terminal to the speaker’s (+)			7
speaker wires are frayed, cut
		terminal.
or punctured.