JBL HTPS-400 manual O U B L E S H O O T I N G, Phase

Phase

The Phase switch is used to	normal THX operation, the	the 180-degree position may
adjust the relative polarity of	Phase switch should be set to	provide a smoother frequency
the subwoofer to the other	0 degrees so that the sub-	response.
speakers. When the speakers	woofer is operating in phase
are out of phase, the low-	with the main speakers. This	Listen to your HTPS-400
frequency sound waves will	should produce a smooth	subwoofer and main speakers
cancel each other out,	frequency response up to	with the switch in the “0°”
reducing bass response.	80Hz. In rare cases when the	position, then listen to the
The HTPS-400 provides a	subwoofer is placed more	same material with the switch
convenient phase switch that	than 25 feet away from the	set to “180°”. Decide which
allows you to remedy this	main speakers, or where the	sounds better and leave the
situation without relocating	subwoofer is not being used	switch in this position. Repeat
the speakers or changing any	with a THX-certified receiver,	this procedure if you change
speaker connections. In	or processor, and speakers,	the location of the subwoofer.

T R	O U B L E S H O O T I N G
If there	is no output from the	If there is no (or low) bass	If you are hearing	midrange
subwoofer:		output:	frequencies (such as vocals)
• Make sure the system is on		• Make sure that the sub-	through the subwoofer:
and a source is playing.		woofer is plugged into a live	• When using the THX mode,
• Make sure the HTPS-400 is		electrical outlet and the	make sure the subwoofer
plugged into an active outlet		power switch is in either the	crossover is activated on your
and the power switch is in		“Auto” or “On” position.	processor/receiver.
either the “Auto” or “On”		• Adjust the “Crossover	• When using the Normal
position.		Frequency.”	Mode, adjust the “Crossover
• If you are using a THX-		• Adjust the “Output Level”	Frequency” to a lower
certified processor/receiver,		(Gain) control.	frequency.
make sure the THX/Normal		• Change the setting on the
switch is set to “THX.”		Phase switch.
• If you are not using a THX-		• If you are not using a THX-
certified processor/receiver,		certified processor/receiver,
make sure the THX/Normal		make sure that you have
switch is set to “Normal.”		configured your processor/
• Adjust the “Output Level”		receiver so that the sub-
(Gain) control.		woofer/LFE output is on.

•Review proper operation of your receiver/amplifier.

•Check all wires and make sure they are properly connected. Make sure none of the wires are frayed, cut or punctured.

•If you are not using a THX- certified processor/receiver, make sure that you have configured your processor/ receiver so that the subwoofer/

LFE output is on. 7