Xantech installation instructions Connecting the PA1235, Stereo Mode Connections

2.If mounted in an equipment cabinet or other confining location, allow at least 2 inches of space above the top cover (see Fig. 4). Be sure there are large openings in the shelf below the unit and in the cabinet to allow the entry of cool air and the escape of warm air.

3.If the cabinet contains other heat generating components or you are using several PA1235's in a large multi-zone system, you will have to pay even closer attention to adequate ventilation.

4.Do not hesitate to use fans (quiet, boxer type), if necessary, to ensure a constant flow of air through the PA1235's and the other heat generating components.

5.When mounting in a 19" (483mm) rack, adding a single RU (Rack Unit) above and below the PA1235 will improve convection in heavy use applications.

[One Rack Unit size = 1-3/4" (44.5mm) in height].

6.The PA1235 will operate when mounted either horizontally or vertically. Horizontal placement is preferred, however, since it will run approximately 5% to 10% cooler when so oriented.

7.In multi-zone installations, you will have large bundles of wire and cable to accommodate audio, video and speaker connec- tions. Be sure to allow enough room for the leads and dress them in such a manner so as not to block airflow.

VIDEO

L

AUDIO

R

1

Preamp Outputs

ZPR68, etc.

RCA Type

Patch Cords

8.The PA1235 is designed for mounting into standard 19" Rack Panels or on flat horizontal surfaces. When mounting into a 19" rack, use the rack panel cup washers and screws supplied.

NOTE: You should consider some sort of rear support for rack mounted units when used in mobile applications or when located in seismically-active areas.

CONNECTING THE PA1235

When making connections to the PA1235 be sure the power cord is unplugged. Proceed as follows:

Stereo Mode Connections

1.Using good quality RCA-type patch cables, connect the L and R OUTPUT jacks of the driving preamp to the LEFT and RIGHT input jacks on the PA1235. Do this for each amplifier pair. Refer to Fig. 6.

2.Slide the MODE switch to the STEREO position.

3.Using good quality speaker wire, connect the individual speaker leads to the 4-terminal "SPEAKER" connectors on the PA1235 as shown.

4.The PA1235 is 4-Ohm safe in Stereo Mode. Make sure the impedance presented to the speaker terminals by the speak- ers (or any combination of speakers) is 4-Ohms minimum.

5.Be sure to observe correct polarity by connecting the "+" and "–" terminal from each channel on the PA1235 to the corre- sponding "+" and "–" terminals on each speaker. This will ensure correct "phasing". See Fig. 6 and Speaker Phasing, following.

Since the connectors are removable, you may unplug them for ease of lead assembly.

	® 
8

	Set MODE
	Switch to
	STEREO position
COMMON BUS	PA1235
	Rear Panel

LEFT	LOCAL		RIGHT
		1
	STEREO			WARNING
MODE		MONO		TURN POWER
	BRIDGED
				OFF BEFORE
CI	GROUND	STATUS	INIR	CHANGING
				MODES
+	BRIDGED --

SPEAKER

LEFT RIGHT

+ -- -- +

Be sure speakers are connected with correct polarity as shown.

+ – + –

Wall speakers,

shelf speakers, etc.

Left Right

Fig. 6 STEREO Mode Connections

PA1235