Xantech PA640 installation instructions Bridged Mode Connections

INSTALLATION (cont'd)

Bridged Mode Connections

In general, it is recommended that the BRIDGED

mode not be used in multi-room applications						Preamp Outputs
			VIDEO			ZPR68, etc.
where several speakers are driven through room
volume controls and the like. For such applica-						RCA Type
tions, use the STEREO mode. Instead, use the			L
BRIDGED mode for single speaker, higher power						Patch Cords
			AUDIO
applications, such as in surround sound systems.
			R				Set
Use speakers with an impedance rating of 8-Ohms
							BRIDGED/STEREO
minimum.				1			Switches to
To make connections for the BRIDGED							BRIDGED position
mode, follow the steps given before for
stereo connections, but with the follow-
ing exceptions:		LEVEL		BRIDGED		LEVEL		BRIDGED
1.	Connect RCA type patch cables	1V	C H 1	C H 2		1V	H 3	C H 4
	from the OUTPUT jacks of the				STEREO			STEREO
	driving preamp or other source to
		3V	.2V			3V	.2V
	the PA640 LINE INPUT jacks
	marked CH1, and/or CH3, and/or		LINE INPUTS				LINE INPUTS
	CH5. Do this for just the amplifier	PA640 Input Panel
	pairs you wish to run in the bridged						PA640 Speakers & AC Panel
	mode.
	(Jacks marked CH2, CH4 & CH6		CH4	CH3			CH2	CH1
	are disabled in BRIDGED mode).		+ –	– +			+ –	– +
		PROTECTION				PROTECTION
	Refer to Fig. 7.
	CAUTION: Be sure power is OFF
	when connecting or switching the		+ B R I D G E D –				+ B R I D G E D –
	amp for BRIDGED operation.		S P E A K E R S				S P E A K E R S
2.	Slide the BRIDGED/STEREO
	switch to the BRIDGED position.				Be sure speakers are
	NOTE: Do this only on the amplifier pairs you				connected with correct
	wish to run in the bridged mode!					polarity as shown.

3.Connect one speaker wire pair between the 4- terminal "SPEAKERS" connectors on the PA640 and the speakers as shown in Fig. 7. Be sure to use only the two outer terminals marked "+" and "–" on the 4-terminal connec- tor as shown on the panel for BRIDGED connections.

NOTE: Only one speaker is connected per amplifier pair in the BRIDGED mode!

+ – + –

Speaker Systems

Left Right

Fig. 7 BRIDGED Mode Connections

CAUTION: When operating in the BRIDGED mode (particularly when bench testing the amplifier) do not make a ground or any other kind of connection to the amplifier speaker terminals other than those to the individual speakers as shown. Failures caused by inappropriate connections are not covered under the warranty.

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PA640