Page 8
Model PA635X
© 2001 Xantech Corporation
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. 6. Do this for just the amplifier pairs
you wish to run in the bridged mode.
CAUTION
: Be sure
Power is OFF
when connecting or switching the amp into or out of 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 PA635X and the speakers
as shown in Fig. 6. Be sure to use only the two outer terminals marked "+” and "–" on the 4-terminal connector as
shown on the panel for BRIDGED connections.
NOTE: Only
one speaker
is connected per amplifier pair in the BRIDGED mode!
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.
Connecting the REMOTE MASTER ON/OFF CONTROL Terminal
As mentioned under "PA635X PANEL AND FEATURE DESCRIPTIONS", the REMOTE MASTER ON/OFF
CONTROL terminal allows the power to the PA635X to be turned ON and OFF by a remotely applied DC Voltage.
Fig. 7 illustrates how a PA635X can be switched ON and OFF via the switched AC outlet on the rear of a preamplifier.
When the preamplifier Power Switch is switched ON, power is applied to the DC adapter, which in turn applies 5V to
30V DC to the PA635X, switching it ON. Similarly, when the preamplifier is switched OFF, the DC voltage to the
PA635X is removed, turning it OFF.
REMOTE
MASTER
ON/OFF
CONTROL
5-30 VOLTS DC
+
--
GROUND
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)
PA635X
(portion of rear panel)
(+)
CAUTION:
You
must
use the included
220 ohm resistor.
FIGURE 7 - USING THE PA635X REMOTE MASTER ON/OFF CONTROL TERMINALS