®
13
Amplifiers & Preamplifiers
REMOTE MASTER
ON/OFF CONTROL
5-30 VOLTS DC
+
--
COMMON BUS
LOCAL
LEFT
RIGHT
STEREO
MONO
BRIDGED
CI
GROUND
ST
A
TUS
IR IN
LEFT
RIGHT
SPEAKER
+
-- --
+
+
BRIDGED
--
2
COMMON BUS
LOCAL
LEFT
RIGHT
STEREO
MONO
BRIDGED
CI
GROUND
ST
A
T
AUS
IR IN
LEFT
RIGHT
SPEAKER
+
-- --
+
+
BRIDGED
--
3
CAUTION
RISK OF ELECTRIC
SHOCK. DO NOT OPEN
MODE
MODE
5V to 12 VDC Adapter,
such as a Xantech 781RG,
plugged into a Switched
AC Outlet on Preamplifier
Preamplifier, Control Center, etc.
This
must
be the positive
(+)
lead (
white striped
lead on
Xantech Power Supply Adapters).
PA1235
(portion of rear panel)
(+)
CAUTION:
You
must
use the included
220
Ω
resistor. See
CAUTION note above.
Fig. 9
Using the REMOTE MASTER ON/OFF
CONTROL Terminals
•
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!
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).
PA1235
