GENERAL INFORMATION.........................................................................................................................................2
PA635X PANEL AND FEATURE DESCRIPTIONS .................................................................................................... 3
INSTALLATION
Physical Location and Mounting............................................................................................................................5
CONNECTING THE PA635X......................................................................................................................................6
To enhance the ease of installation and obtain optimum performance from the PA635X, we recommend that you first
become familiar with all its features and special capabilities by studying the descriptions and instructions in this
manual.
The PA635X was designed to meet the audio power amplifier needs of custom installed multi-zoned systems with
high sonic quality. It's 6-5-4-3 multi-channel capability permits a wide variety of other uses as well, such as surround
sound home theater applications. Specific features and technology are as follows:
Cost/Size Efficiency. The PA635X features six 35-watt power amplifiers. This permits each PA635X to drive 3zones in a multi-zone system -- each with a 35-watt stereo amplifier per zone. The rack-mount design, plus multiple
amplifiers in a single package, delivers high quality at a reasonable price.
Input Level Flexibility. The input levels are indiv idually adjustable (per stereo pair) from a low of 0.2 volts up to 3
volts. This gives the installer the ability to adjust the overall gain of the system or zone. For instance, there may be a
need to adjust the amplifier to deliver a controlled, maximum sound level into a zone when the volume control on the
preamp is set to maximum. This would act as a volume limiter for any particular zone (i.e. to prevent the kids from
over-driving wall speakers, etc.).
3
PA635X
SIX CHANNEL AMPLIFIER
POWER
1
2
FIGURE 1 – THE MODEL 635X
6-5-4-3 Output Flexibility. Each pair of amplifiers can be bridged to allow several channel and power output
capabilities. It can be configured into four power packages as follows Which gives the PA635X added use in many
other applications, such as driving surround sound speaker systems:
• Six 35-watt amplifiers.
• One 70 and four 35-watt amplifiers.
• Two 70 and two 35-watt amplifiers.
• Three 70-watt amplifiers.
Low Impedance Capability. Each amplifier is 4-Ohm safe under music conditions in stereo mode and 8-Ohm safe
when bridged. This means, for instance, that you can drive two pairs of 8-Ohm speakers in stereo mode in each zone
with ease.
Auto Protection Circuit. Protects the PA635X if a short or very low impedance is detected at the speaker terminals.
Each amplifier pair is protected separately, with an LED indicator showing which pair is in protection. Normal
operation is restored automatically within 3 to 4 seconds after the short is removed.
Remote Master ON/OFF Control Jack. This jack allows the PA635X to be powered on and off by a positive DC
voltage ranging between 4 and 30 volts (11mA @ 12 V). Specifically, it permits the 12 volt common CO (Control
Output) or zone STATUS outputs from the Xantech ZPR68 to power one or more PA635X's ON and OFF
automatically with zone ON/OFF commands.
1. Front Panel. 19" X 3 1/2" panel designed for mounting into a standard 19" Rack Panel.
2. Rack Panel Handles.
21
3
3
PA635X
SIX CHANNEL AMPLIFIER
POWER
1
1
2
2
3
4
2
FIGURE 2 – THE MODEL PA625X FRONT PANEL – FEATURES AND FUNCTIONS
5
55777
14
8
WARNING
: TO REDUCE THE RISK OF
FIRE OR ELECTRICAL SHOCK, DO NOT
EXPOSE THIS UNIT TO RAIN, MOISTURE
OR PLACE WATER FILLED OBJECTS ON
THE PRODUCT.
ATTENTION
: RISQUE DE CHOC ELECTRIQUE
NE PAS OUVRIR.
NO USER SERVICABLE PARTS INSIDE.
REFER TO OWNERS MANUAL FOR SAFETY INSTRUCTIONS.
ATTENTION
: POUR UN REGLAGE
CORRECT, SE REPORTER AU MANUEL
DINSTRUCTIONS.
MODEL PA635X
GROUND
REMOTE
MASTER
ON/OFF
CONTROL
5-30 VOLTS DC
+--
11
THIS DEVICE COMPLIES WITH
PART 15 OF THE FCC RULES.
OPERATION IS SUBJECT TO
THE FOLLOWING TWO
CONDITIONS: (1) THIS DEVICE
MAY NOT CAUSE HARMFUL
INTERFERENCE, AND (2) THIS
DEVICE MUST ACCEPT ANY
INTERFERENCE RECEIVED,
INCLUDING INTERFERENCE
THAT MAY CAUSE
UNDESIRED OPERATION.
10
LEFTRIGHT
1
1V
LEVEL
3V
SPEAKER
LEFT RIGHT
LEFTRIGHT
MODE
STEREO
MONO
BRIDGED
.2V
USE CLASS 2
WIRING FOR
+-- --+
LOUDSPEAKERS
2
1V
LEVEL
3V
+ BRIDGED -- + BRIDGED --
SPEAKER
LEFT RIGHT
.2V
+-- --+
MODE
STEREO
MONO
BRIDGED
WARNING
TURN POWER
OFF BEFORE
CHANGING
MODES
LEFTRIGHT
3
1V
LEVEL
3V
+ BRIDGED --
SPEAKER
LEFT RIGHT
FUSE
6.25 AMP
666
AC 120V 60Hz
5.5A 660 WATTS
CAUTION
NEUTRAL
FUSING
SLOW BLOW
AC LINE
ON/OFF
1399912
MODE
STEREO
MONO
BRIDGED
.2V
+-- --+
FIGURE 3 – PA635X REAR PANEL - FEATURES AND FUNCTIONS
3. POWER SWITCH When pressed to the IN position, power is applied to the PA635X [provided the rear panel
master AC LINE ON/OFF Switch, item #13, is placed in the ON (I) position]. This is the MANUAL ON position.
When pressed again, it releases to the OUT position (MANUAL OFF), turning the unit OFF.
In addition, this switch must be left in the MANUAL OFF (OUT) position to permit an external DC Control Voltage
to power the PA635X ON and OFF. Refer to "REMOTE MASTER ON/OFF CONTROL" terminals, item #10.
NOTE: The PA635X may also be powered ON/OFF with an external AC line switch into which the power cord of
the PA635X is plugged (such as the switched AC outlet of a preamp, timer, etc. with a 5A minimum rating). For
this type of operation, leave the POWER switch depressed to the MANUAL ON position.
4. Status LED Indicators. These indicators, one for each channel pair, provide the following status information:
• They show Power ON/OFF and Standby ON/OFF conditions.
• They flash Amber 5 times during power up, then turn steady Green when Power On Mute releases. This
action occurs whether the unit is powered ON by the POWER switch (item # 3) or by a DC voltage applied to
the REMOTE MASTER ON/OFF CONTROL terminals (item #10). Be sure the rear panel master AC LINE
ON/OFF Switch, item #13, is set to the ON (I) position for the above to occur.
5. Line Inputs. These RCA-type jacks are the audio inputs for each of the amplifier pairs. Connect them to the
OUTPUT jacks of the driving preamp with good quality RCA-type patch cables. Note that the inputs are marked
LEFT-1-RIGHT, LEFT-2-RIGHT, etc., signifying the stereo channel pairs. Both the LEFT and RIGHT jacks are
also active when the MODE switch (item #7) is set to the MONO or BRIDGED mode.
6. Input LEVEL Control. This screwdriver adjustable control (for each stereo or bridged pair) allows the input level
for full rated power output to be adjusted over a range of 0.2 volts to 3 volts (24.3 dB). Normally you would adjust
the driving preamp to max. v olume, then set this control to the maximum volume that the client desires for a given
zone or room. This prevents the system from being driven to potentially destructive power levels.
7. MODE Switch. Switches the amplifier pair between STEREO, MONO and BRIDGED modes.
a) In STEREO mode, the two amplifiers operate independently of each other for 35 Watts of output each, except
IR control of Volume, Max-V, Mute, Standby OFF/ON and Balance functions is common to both.
b) In MONO mode, left and right input signals are summed internally for Mono output from each of the two
amplifiers. Also, either the Left or Right (item #5) input may be used if the source is already a Mono signal.
c) In BRIDGED mode, the two amplifiers are bridged for a single channel of high power output (150 W atts @ 8
Ohms). Either the Left or Right input (item #5) may be used to drive the resultant single channel amplifier.
CAUTION: Be sure to have the POWER turned OFF when changing the position of this switch and when making
the corresponding speaker connection changes (see also item #9, following).
8. FUSE. When required, replace only with a fuse of the same type and rating:
• 120 V Version: 6.25 AMP 250 VAC, SLOW BLOW.
• 240 V Version: 3.15 A Time-Lag 250 VAC.
• Replacement with a fuse of higher rating will not protect the amplifier and will void the warranty.
9. SPEAKER Terminals. These plug-in 4-terminal screw type connectors permit speaker wire sizes up to 12
gauge. When making connections for the STEREO mode, be sure to observe the "+” and "–" polarity markings,
just under the LEFT & RIGHT markings, for each wire pair going to the speakers.
CAUTION: When making connections for the BRIDGED mode, remember, only one speaker is being attached
per amplifier pair. Be sure to observe the outer "+” and "–" polarity markings on each side of the word
"BRIDGED" on the panel above the 4-terminal connector when connecting the 2-conductor wire to the speaker.
10. REMOTE MASTER ON/OFF CONTROL. This 2-terminal connector allows the entire PA635X to be powered ON
and OFF by a control voltage ranging between 5 and 30 Volts DC (16mA @ 12 V). Be sure to observe the
marked polarity. For instance, the 12 volt common CO (Control Output) of the Xantech ZPR68 preamp will power
the PA635X ON and OFF automatically with the first zone ON and last zone OFF commands. The DC Voltage
must be applied continuously to retain the ON condition and drop to less than 0.5 Volt to switch to the OFF
condition.
NOTE: The front panel POWER switch (item #3) must be left in the Manual OFF (Out) position and the
Master AC Line Switch (item #13) set to ON (I) to permit the REMOTE MASTER ON/OFF CONTROL to
operate. See also CAUTION notes, Fig. 9.
NOTE: When powering up multiple PA635X’s, a delay of two (2) or more seconds should be incorporated