Xantech PA1235 installation instructions Speaker Phasing, Bridged Mode Connections

6.As a rule of thumb, use 18 gauge speaker wire for speaker runs up to 30' (9m), 16 gauge up to 70' (21m), and 14 gauge up to 150' (39m). The 4-terminal connectors accept wire sizes up to 12 gauge max.

7.Strip the insulation back about 1/4" (6mm) and twist the strands on each lead to prevent fraying.

CAUTION: After lead ends are inserted and the screws tightened down, be sure there are no free strands that could cause shorting!

Speaker Phasing

To obtain stable imaging and full bass response, it is imperative that stereo speakers be connected "in phase" with each other. You can verify this as follows:

a)If the "+" (positive) and "–" (negative) terminals on your speakers are correctly marked, and visible, and you have wired the system as shown in Figs. 6 and 7, then the system will be "in phase". No further action is required.

Most manufacturers identify the positive terminal with a red binding post, a "+" sign, or a red dot.

b) If you are unsure of the markings, you can verify the

phasing. Using a mono sound source, such as AM

radio, alternately reverse the leads to one of the

speakers. Pick the connection that delivers a solid

center image between the speakers as well as best

	Preamp Outputs
VIDEO	ZPR68, etc.

bass response.

Bridged Mode Connections

In general, it is recommended that the BRIDGED mode not be used in multi-room applications where several speakers are driven through room volume controls and the like.

For such applications, use the STEREO mode.

Use the BRIDGED mode for single speaker, higher power applications, such as in surround sound systems. Use speakers with an impedance rating of 8-Ohms minimum.

To make connections for the BRIDGED mode, follow the steps given before for stereo connections, but with the following differences:

1. You may connect the RCA-type patch cables from the

OUTPUT jacks of the driving preamp or other source

to either the LEFT or the RIGHT input jacks of the

bridged pair, as shown in Fig. 7.

Do this for just the amplifier pairs you wish to run in the

bridged mode.

CAUTION: Be sure Power is OFF when connecting

L

AUDIO

R

PA1235

Rear Panel

COMMON BUS

LEFT	LOCAL		RIGHT
		1
	STEREO
MODE		MONO
	BRIDGED
CI	GROUND	STATUS	IR IN
+	BRIDGED --

SPEAKER

LEFT RIGHT

+ -- -- +

	RCA Type
	Patch Cords
	Set MODE
1	Switches to
	BRIDGED position

COMMON BUS
LEFT	LOCAL		RIGHT
		2
WARNING	STEREO
MODE		MONO
TURN POWER	BRIDGED
OFF BEFORE
CHANGING	GROUND	STATUS	INIR
CI
MODES
+	BRIDGED --

SPEAKER

LEFT RIGHT

+ -- -- +

Amplifiers &

or switching the amp for BRIDGED operation.

2. Slide the MODE switch to the BRIDGED position.

NOTE: Do this only on the amplifier pairs you wish to

run in the bridged mode!

3. Connect one speaker wire pair between the 4-terminal

"SPEAKER" connectors on the PA1235 and the speak-

ers as shown in Fig. 7. Be sure to use only the two

outer terminals marked "+" and "–" on the 4-terminal

connector as shown on the panel for BRIDGED con-

nections.

Be sure speakers are connected with correct polarity as shown.

+ – + –

Speaker Systems

Left Right

Fig. 7 BRIDGED Mode Connections

Preamplifiers

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PA1235		9