Xantech PA1235 installation instructions Preamplifier, Control Center, etc, portion of rear panel

•CAUTION: The output voltage of some adapters, such as the 781RG, drops off too slowly to provide a quick turnoff for the PA1235. Therefore, when using any adapter (12 VDC max), always connect the included 220 Ohm 1 Watt resistor in shunt with the REMOTE MASTER ON /OFF CONTROL terminals as shown in Fig.9. Failure to do so may result in blowing of the power line fuse (item #10, Fig.3)

NOTE: Do not use the 220 Ohm resistor when connecting to the CO terminals of a ZPR68!

This must be the positive (+) lead (white striped lead on Xantech Power Supply Adapters).

COMMON BUS COMMON BUS

Preamplifier, Control Center, etc.

LEFT	LOCAL		RIGHT
		2
	STEREO
MODE		MONO
	BRIDGED
CI	GROUND	STATUS	IR IN
+	BRIDGED --
SPEAKER
LEFT		RIGHT
+	--	--	+

		LEFT	LOCAL		RIGHT
				3
CAUTION			STEREO
RISK OF ELECTRIC		MODE		MONO
SHOCK. DO NOT OPEN			BRIDGED
REMOTE MASTER			GROUND	STATAUS	IR IN
ON/OFF CONTROL		CI
(+)
--	+	+	BRIDGED --
		SPEAKER
5-30 VOLTS DC
		LEFT		RIGHT
		+	--	--	+

5V to 12 VDC Adapter,

such as a Xantech 781RG,

plugged into a Switched AC Outlet on Preamplifier

Fig. 9 Using the REMOTE MASTER ON/OFF

CAUTION:

You must use the included

220 Ω resistor. See

CAUTION note above.

PA1235

(portion of rear panel)

CONTROL Terminals

A Multi-Zone Power Managed System, using a ZPR68, a GATEKEEP-IR™and a PA1235

Fig. 11 shows a PA1235 in a typical multi-room system with a Xantech ZPR68-10 six-zone preamp and a GATEKEEP-IR. The PA1235 has been designed specifically to work well with both Zone and All-Zone ON/ OFF management as rendered by the ZPR68-10.

In this example, the STATUS & GND output (0 to +12 VDC) of each zone of the ZPR68-10 is connected, via a 2-conductor lead, to the CI & GROUND of each amplifier pair on the PA1235.

•This causes the ON/OFF condition of any given ZPR68-10 Zone to turn it's corresponding amplifier pair ON/OFF (Standby ON/OFF).

Also, the common CO (control output, 0 to +12 VDC ) from the ZPR68-10 is used to drive the REMOTE MASTER ON/OFF CONTROL terminals of the PA1235.

CAUTION: When making this connection, do not use the included 220 Ohm resistor! Refer also to CAUTION notes, Fig. 9.

•When any one of the zones is turned ON, the common CO goes high (+12V), turning on power to the entire PA1235.

•Similarly, when the last zone is turned OFF, the CO drops to 0 V, turning the PA1235 totally OFF.

NOTE: No IR control of the PA1235 is used in the system shown in Fig. 11. All volume, mute, etc. functions are handled by IR control of the ZPR68-10. The PA1235 amplifier pairs are all set to the default volume level setting by pressing the LEVEL (System) RESET button (refer to item #9, Fig. 3).

AC Power Management of the entire system as shown in Fig. 11 is accomplished, therefore, as follows:

a)The PA1235 is controlled via the STATUS and CO functions as noted above.

b)The Source Components are controlled via the GATEKEEP-IR™sensor system and the IR macros in the Smart Pads and, where used, IR macros in Learning Remotes (such as the Xantech URC types).

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PA1235		13

Amplifiers & Preamplifiers