Xantech Stereo Amplifier PA635 User Manual

INSTALLATION INSTRUCTIONS  
MODEL PA635  
SIX CHANNEL POWER AMPLIFIER WITH IR CONTROL  
TABLE OF CONTENTS  
Section Title  
Page  
GENERAL INFORMATION ................................................................................................................................. 2  
PA635 PANEL AND FEATURE DESCRIPTIONS................................................................................................. 3  
Factory Default Settings, Item #9............................................................................................................ 5  
INSTALLATION  
RC68+ (or RC68) PROGRAMMER / REMOTE CONTROL ..................................................................... 6  
PHYSICAL LOCATION AND MOUNTING .............................................................................................. 9  
CONNECTING THE PA635 .............................................................................................................................. 10  
Stereo Mode Connections..................................................................................................................... 10  
Speaker Phasing................................................................................................................................... 11  
Bridged Mode Connections ................................................................................................................... 11  
Typical Applications............................................................................................................................... 12  
A Basic Common IR Bus System - Dedicated Keypads and Remotes.................................................... 12  
A Basic Dedicated IR System - Non Dedicated Keypads and Remotes.................................................. 14  
Connecting the REMOTE MASTER ON/OFF CONTROL Terminals ...................................................... 16  
A Multi-Zone Power Managed System, using a ZPR68-10, a GATEKEEP-IR and a PA635 ............... 16  
TROUBLE SHOOTING...................................................................................................................................... 18  
SPECIFICATIONS............................................................................................................................................. 19  
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Individual ON/OFF of Amp Pairs. Permits Standby ON/OFF control of individual channel pairs. Specifically, it  
permits the STATUS outputs (12 Volts On/Off) of Xantech ZPR68 zones to switch the Standby of the PA635  
channel pairs (CI) On and OFF with zone ON and OFF commands.  
Remote Master ON/OFF. Allows the entire PA635 to be powered ON and OFF by a positive DC voltage ranging  
between 5 and 30 volts (16mA @ 12V). Specifically, it permits the 12 Volt common CO (Control Output) on the  
Xantech ZPR68 to power one or more PA635's ON and OFF automatically with first zone ON and last zone OFF  
commands.  
CAUTION: When powering up multiple PA635’s, a delay of 2 or more seconds should be incorporated between  
“power on” using multiple Xantech AC2’s.  
Default settings. As received from the factory, Volume level is set to 1 Volt for 3 Watts output, Balance is  
centered and Mute is OFF, for all channels. Also, pressing the LEVEL (System) RESET switch 2 times within 1  
second restores all factory defaults. The PA635 will always return to last set values (volume, etc.) after main  
power shut down or after any power interruptions.  
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 and safety.  
Auto Protection Circuit. Protects the PA635 if a short or very low impedance is detected at the speaker  
terminals or excessive temperatures are reached. Each amplifier pair is protected separately. Normal operation  
is restored automatically when the short is removed or when temperatures drop sufficiently.  
PA635 PANEL AND FEATURE DESCRIPTIONS (refer to Figure 2)  
2
1
2
1
2
3
POWER  
PA635 SIX CHANNEL AMPLIFIER  
3
4
Figure 2 – PA635 Front Panel – Features and Functions  
1. Front Panel. 19" x 3 ½" panel designed for mounting into a standard 19" Rack Panel.  
2. Rack Panel Handles.  
3. POWER Switch. When pressed to the IN position, power is applied to the PA635 [provided the rear panel  
master AC LINE ON/OFF Switch, item 17, 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 PA635 ON and OFF. Refer to "REMOTE MASTER ON/OFF CONTROL" terminals,  
item #13.  
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Model PA635  
NOTE: The PA635 may also be powered ON/OFF with an external AC line switch into which the power cord  
of the PA635 is plugged (such as the switched AC outlet of a preamp, timer, etc. with a 10A 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:  
a) They show Power ON/OFF and Standby ON/OFF conditions.  
b) 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 and OFF by the POWER switch (item # 3) or by a DC  
voltage applied to the REMOTE MASTER ON/OFF CONTROL terminals (item #13). Be sure the rear  
panel master AC LINE ON/OFF Switch, item #17, is set to the ON (I) position for the above to occur.  
c) They will go off when the Standby OFF IR command is received. Sending a MUTE OFF command will  
restore operation. Also, each LED blinks with Volume action for that channel.  
d) A Mute command will cause the channel LED to blink Green (Red if Volume is within 5 dB of Max-V).  
Mute is released when any other PA635 command is sent.  
e) Changing an IR Code Group will cause them to blink Amber, confirming the change has taken effect.  
f) When the volume level is increased to a range within 5 dB of MAX-V, the LED color changes from Green  
to Red. NOTE: Red indicates that volume gain setting is approaching maximum --- not an indication of  
power output level.  
9
8
18  
10  
5
5
5
7
6
7
6
7
6
COMMON  
AUDIO  
BUS  
WARNING  
WARNING  
FUSE  
LEFT  
RIGHT  
LEFT  
RIGHT  
LEFT  
RIGHT  
LEFT  
RIGHT  
6.25 AMP  
TURN POWER  
OFF BEFORE  
CHANGING  
MODES  
TURN POWER  
OFF BEFORE  
CHANGING  
MODES  
1
2
3
CAUTION  
SLOW BLOW  
MODE  
MODE  
MODE  
REMOTE  
MASTER  
ON/OFF  
RISK OF ELECTRIC  
SHOCK. DO NOT OPEN  
COMMON  
LOCAL  
COMMON  
LOCAL  
COMMON  
LOCAL  
STEREO  
STEREO  
STEREO  
LEVEL  
RESET  
MONO  
MONO  
MONO  
BRIDGED  
BRIDGED  
BRIDGED  
CONTROL  
AC 120V  
60 HZ  
2 AMP  
--  
+
+
BRIDGED --  
+
BRIDGED --  
+
BRIDGED --  
SPEAKER  
SPEAKER  
SPEAKER  
LEFT  
+
5-30 VOLTS DC  
LEFT  
LEFT  
-- -R- IGHT  
+
+
-- -R- IGHT  
+
-- -R- IGHT  
+
AC LINE  
ON/OFF  
®
+
14  
15  
13  
11  
11  
11  
16  
12  
12  
12  
17  
Figure 3 – PA635 Rear Panel – Features and Functions  
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. COMMON BUS / LOCAL Switch. Switches the amplifier stereo pair inputs between the LOCAL  
(LEFT/RIGHT) jacks, item #5 and the COMMON AUDIO BUS (LEFT/RIGHT) jacks, item #8. In this way,  
each amplifier pair can be driven by separate zones or sources or from a common source via the COMMON  
AUDIO BUS.  
7. MODE Switch. Switches the amplifier pair between STEREO, MONO and BRIDGED modes.  
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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.  
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.  
In BRIDGED mode, the two amplifiers are bridged for a single channel of high power output (150 Watts @ 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 #12, following).  
8. COMMON AUDIO BUS. A single audio source, such as from a connected preamp, can drive one or more of  
the amplifier pairs simultaneously, as desired, from this Bus. Any of the amplifier pairs can be switched to the  
COMMON AUDIO BUS at will by use of the COMMON BUS / LOCAL Switch (see also item #6).  
9. LEVEL (System) RESET Button. Pressing this button 2 times within 1 second restores all factory default  
settings. The factory defaults for all channels are as follows:  
Input Level set to 1 Volt rms for 3 Watts output.  
Balance centered.  
Mute OFF.  
MAX-V Cleared.  
IR Code Group set to B0 (the PA1235 uses code group A0).  
CI (control in) disabled. Changes CI control to IR control of Standby ON/OFF. (CI enables when +5 to  
+30 VDC is applied to CI for 2 or more seconds. See also item #11).  
NOTE: The PA635 will always return to last set values (plus any unaltered factory defaults) after main power  
shut down or after any power interruptions.  
10. 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.  
11. IR IN, STATUS, GROUND and CI Terminals. Removable, 4-Terminal, screw type plug-in connector.  
IR IN = IR Signal. Receives IR Input from Xantech IR Receivers, Smart Pads, Connecting Blocks, etc.  
STATUS Out. Delivers a constant +12 VDC output (9V @ 70 mA) with ON condition. 0 Volts output =  
OFF (Standby).  
GROUND. Ground for IR IN, STATUS out & CI in.  
CI = Control Input. Use for control of Standby ON/OFF of amplifier pairs, if desired, instead of by IR. After  
CI is enabled (see item #9), 0 Volts input = OFF (Standby) condition and +5 to +30 VDC input = ON  
condition. (12V in draws 16 mA).  
NOTE: All plug-in connectors accept wire sizes from 24 to 12 gauge.  
12. 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  
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word "BRIDGED" on the panel above the 4-terminal connector when connecting the 2-conductor wire to the  
speaker.  
13. REMOTE MASTER ON/OFF CONTROL. This 2-terminal connector allows the entire PA635 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 PA635 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 #17) set to ON (I) to permit the REMOTE MASTER ON/OFF CONTROL to  
operate. See also CAUTION notes, Fig. 9.  
14. Rear Panel ON/OFF LED. This LED indicates the power ON/OFF condition of the entire PA635, whether  
activated by a REMOTE MASTER ON/OFF CONTROL voltage (item #13) or from the front panel POWER  
switch (item # 3).  
15. Common IR IN and STATUS Connector. This 4-terminal connector provides the same type of IR control  
functions as that of the individual amplifier pairs (item #11) except they apply to all amplifier pairs in common.  
That is, IR commands for Volume, Mute, etc., control all amplifier pairs together.  
NOTE: Individual control of amplifier pairs is possible, however, through the Common IR IN, provided the IR  
Code Group is changed on amplifier pairs you wish to control separately. The STATUS output goes high and  
low with the AC Power ON/OFF state of the entire PA635. It does not respond to a Common IR OFF/ON  
(Standby) condition.  
16. Grounding Screw. Provides a means for chassis connection to earth ground or to other A/V products to aid  
in the reduction of system noise, etc., where needed.  
17. Master AC LINE ON/OFF Switch. Turns power OFF to the entire PA635, regardless of IR, Control IN, or  
front panel POWER switch conditions. Must be placed in the ON (I) position for the other power switching  
functions to work.  
18. 3-Conductor AC Line Cord Receptacle. Standard IEC male receptacle for plug-in of a 3-conductor power  
line cord. Depending on the application, plug the line cord into a switched or un-switched 120V 60 Hz AC  
outlet (or 240 VAC 50 Hz on the 240 V version).  
RC68+ (or RC68) Programmer / Remote Control  
The RC68+ Programmer (available separately) contains all the commands necessary to operate the IR control  
functions of the PA635.  
You will need it to program universal learning devices such as the Xantech URC-2 learning remote, Xantech  
SmartPads, 590-10 Programmable Controller, 710 Fone Link, etc., with commands that operate the PA635.  
NOTE: The RC68+ codes operate many other Xantech models as well, such as the RGC11, CC12, ZPR68, etc.  
Therefore, only the button descriptions that apply to the operation of the PA635 are listed below. All others  
should be ignored.  
CAUTION: While the RC68+ can be used as a handheld remote control, it is highly recommended it not be given  
to the final user for the following reasons:  
Since it includes adjustable code groups, the user may inadvertently alter the installer configurations.  
Also, since the user will require IR commands from other brands of equipment to control the total system,  
in addition to those of the PA635, all commands should be consolidated into one learning device, for ease  
of use.  
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Page 7  
Applicable RC68+ Button Descriptions  
1
10  
9
A
A
B
C
ADJ-OFF  
80  
48  
10  
90  
01  
41  
21  
61  
09  
29  
69  
49  
E9  
79  
F9  
1
2
3
4
00  
C0  
50  
D0  
INPUT  
5
6
7
8
2
40  
A0  
30  
B0  
GLOBAL  
20  
E0  
70  
F0  
TREBLE BASS  
VOL  
Z-ADJ  
8
7
60  
08  
88  
18  
98  
MUTE  
A8  
38  
B8  
ON  
OFF  
28  
E8  
78  
F8  
E-FLAT  
LAST  
MAX-V  
TRIM  
68  
C8  
89  
19  
99  
58  
D8  
A9  
39  
3
OFF  
C-BAL  
6
5
E1  
71  
F1  
C9  
59  
D9  
4
B9  
RC68+ PROGRAMMER  
Figure 4 – The RC68+ Programmer  
1. IR Emitter Lens.  
2. Instant Volume Presets. These commands allow random access or direct preset activation of any of 12 fixed  
preset levels on the PA635. This is useful when setting up "audio scene" ambiance levels for rooms or partial  
mute actions. The RC68+ buttons that select a fixed level attenuation below Max. Volume is as follows:  
RC68+ PA635  
Button  
38  
Level Attenuation in dB  
(Mute ON)  
> 90 (Min. Volume)  
10  
(C & 01 on RC68)  
60  
00  
(1)  
52  
C0  
50  
(2)  
(3)  
44  
36  
D0  
(4)  
30  
40  
(5)  
24  
A0  
30  
(6)  
(7)  
18  
14  
B0  
20  
E0  
(8)  
10  
6
(Treble Up Arrow)  
(Bass Up Arrow)  
0 (Max. Volume)  
3. OFF Command. Turns the amplifier pairs (both LOCAL and COMMON) to Standby OFF mode (audio mute  
and 0.0VDC on Status). The "Standby OFF" mode remains until the MUTE OFF command is sent.  
NOTE: This command is inhibited automatically when the CI terminal is driven high with an external control  
voltage. Refer also to items 9 and 11, Fig. 3.  
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4. C-BAL Command. Instantly returns the balance to the Center position (equal volume in each channel) from  
any previous setting.  
5. Balance Commands. When the Balance "arrow" buttons are pressed, the audio output will move to the left  
or right (with a 2 dB/step reduction in the attenuated channel) with each left or right press.  
NOTE: These commands do not ramp. That is, no change will occur if the BALANCE buttons are held  
down continuously!  
6. MAX-V. This command saves a maximum desired volume level for a zone or rooms (both LOCAL and  
COMMON). The volume is first adjusted to what is desired as a maximum level. The MAX-V button is then  
pressed, locking in this setting. This acts as a volume limiter for the system (e.g. to prevent the kids from  
over-driving wall speakers, etc.).  
To unlock the MAX-V setting, press the ADJ-OFF button (item #10).  
7. MUTE ON/OFF. Separate ON / OFF Mute commands give positive mute action without knowing the actual  
mute status. This is very helpful in a remote room where commands are sent “blind” without any visual aids  
for status.  
NOTE: In addition to MUTE OFF, the muted condition can be released with VOLume (item #8), Preset Level  
(item #2) and Balance (items #4 & 5) commands.  
8. Volume Up/Down Commands. When pressed in individual steps, volume increase and decrease is 2 dB  
per step over a range of 0 dB (Max.) to -60 dB. The next step below -60 dB is OFF (> -90 dB). When  
pressed continuously, volume level will change (ramp) continuously in 1 dB steps. See also MAX-V settings  
(item 6).  
NOTE: Volume action of the PA635 has been designed specifically to ramp more quickly in the DOWN  
direction and more slowly in the UP direction.  
9. Code Group Numbers. The PA635 is capable of being set to 55 different code groups, both individually as  
amplifier pairs and collectively as a group.  
Be sure to set the RC68+ to the same number!  
It may be necessary to change the PA635 amplifier pairs to different code groups if you wish to address each  
pair individually from the COMMON IR BUS (item #15, Fig. 3) or an external common IR bus network when  
using other Xantech PA635's in large systems, to avoid mutual interaction.  
Refer to the RC68+ instructions for code group setting procedures.  
NOTE: As shipped from the factory, all amplifier pairs in the PA635 are set to code group number B0.  
10. ADJ-OFF Command. This command unlocks a previous MAX-V setting. See also item #6.  
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INSTALLATION - PHYSICAL LOCATION AND MOUNTING  
When you mount the PA635, you should plan its location carefully. Pay attention to each of the following factors:  
Upper shelf, component, wall, etc.  
2-inch spacing  
Keep perforations on top cover free of  
obstructions for max. cooling effect.  
(minimum)  
PA635  
Convection  
Airflow  
To maximize air flow, route  
single large opening in lower shelf.  
Keep perforations on bottom  
plate free of obstructions.  
Figure 5 – Horizontal Mounting  
1. The amplifier is convection cooled - it depends on the natural free flow of air up through the slot perforations  
in the bottom plate, over the internal heat dissipating fins, then out the top cover, for adequate cooling.  
2. If mounted in an equipment cabinet or other confining location, allow at least 2 inches of space above the top  
cover (see Fig. 5). 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.  
NOTE: Do not remove feet in shelf-top installations.  
3. If the cabinet contains other heat generating components or you are using several PA635'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  
PA635'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 PA635 will  
improve convection in heavy use applications (one Rack Unit size = 1-3/4" (44.5mm) in height).  
6. In multi-zone installations, you will have large bundles of wire and cable to accommodate audio, video and  
speaker connections. Be sure to allow enough room for the leads and dress them in such a manner so as not  
to block airflow.  
7. The PA635 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.  
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Model PA635  
CONNECTING THE PA635  
When making connections to the PA635 be sure the power cord is unplugged. Proceed as follows:  
Preamp Outputs  
ZPR68, etc.  
VIDEO  
RCA Type  
Patch Cords  
L
AUDIO  
R
Set MODE  
Switch to  
1
STEREO position  
PA635  
Rear Panel  
LEFT  
RIGHT  
1
MODE  
COMMON  
LOCAL  
STEREO  
MONO  
BRIDGED  
+
BRIDGED --  
SPEAKER  
LEFT  
+
-- -R- IGHT  
+
Be sure speakers are  
connected with correct  
polarity as shown.  
+
+
Wall speakers,  
shelf speakers, etc.  
Left  
Right  
Figure 6 – Stereo Mode Connections  
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 PA635. 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 PA635 as shown.  
4. The PA635 is 4-Ohm safe in Stereo Mode. Make sure the impedance presented to the speaker terminals by  
the speakers (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 PA635 to  
the corresponding "+" 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.  
6. As a rule of thumb, use 18 gauge speaker wire for speaker runs up to 30' (9m), 16 gauge up to 70' (21m), and  
14 gauge up to 150' (39m). The 4-terminal connectors accept wire sizes up to 12 gauge max.  
7. Strip the insulation back about 1/4" (6mm) and twist the strands on each lead to prevent fraying.  
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CAUTION: After lead ends are inserted and the screws tightened down, be sure there are no free strands  
that could cause shorting!  
Speaker Phasing  
To obtain stable imaging and full bass response, it is imperative that stereo speakers be connected "in phase"  
with each other. You can verify this as follows:  
a) If the "+" (positive) and "–" (negative) terminals on your speakers are correctly marked, and visible, and you  
have wired the system as shown in Figs. 6 and 7, then the system will be "in phase". No further action is  
required. Most manufacturers identify the positive terminal with a red binding post, a "+" sign, or a red dot.  
b) If you are unsure of the markings, you can verify the phasing. Using a mono sound source, such as AM  
radio, alternately reverse the leads to one of the speakers. Pick the connection that delivers a solid center  
image between the speakers as well as best bass response.  
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.  
Preamp Outputs  
ZPR68, etc.  
VIDEO  
RCA Type  
Patch Cords  
L
AUDIO  
R
Set MODE  
Switch to  
BRIDGED position  
PA635  
Rear Panel  
1
LEFT  
RIGHT  
LEFT  
RIGHT  
1
1
MODE  
MODE  
COMMON  
LOCAL  
COMMON  
LOCAL  
STEREO  
STEREO  
MONO  
MONO  
BRIDGED  
BRIDGED  
+
BRIDGED --  
+
BRIDGED --  
SPEAKER  
SPEAKER  
LEFT  
LEFT  
+
-- -R- IGHT  
+
+
-- -R- IGHT  
+
Be sure speakers are  
connected with correct  
polarity as shown.  
+
+
Wall speakers,  
shelf speakers, etc.  
Left  
Right  
Figure 7 – Bridged Mode Connections  
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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. 7. 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 PA635 and the  
speakers as shown in Fig. 7. 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.  
Typical Applications  
Since the PA635 has an IR control system for each amplifier pair, it can be configured so that each individual  
room, in a multi-room system, can have Line Level Volume, Mute, Balance, and Standby ON/OFF action via IR or  
Smart Pad control. This eliminates the need for speaker level volume controls and their attendant power losses  
and reduced sound quality.  
A Basic Common IR Bus System - Dedicated Keypads and Remotes.  
A typical system using a low cost approach is shown in Fig. 8. It does require that a dedicated remote be used in  
each room that has an IR receiver - that is, remote commands for Volume, etc., are specific for each room.  
The system is configured as follows:  
1. An RS41AV is used as a low cost 4-source selector, an ideal solution when only a few sources are desired.  
2. Both IR receivers and keypads are used for system control from designated rooms.  
3. A CB18 is used as a convenient parallel connecting block for the common +12 VDC, IR signal and GND bus  
wiring for all the home runs from the keypads and IR receivers in the remote rooms.  
4. The Common IR is taken from the #2 connector on the CB18 (connection to any of the other connectors  
would also work) and run to the Common IR IN on the PA635 with a 2-conductor lead. Refer to Fig. 8.  
5. To provide common IR control to the RS41AV and the Source Components and to power the keypads and IR  
receivers, three leads are connected between the CB18 and a 789-44 Connecting Block.  
6. Since a common IR bus is used to keep costs low, each of the amplifier pairs on the PA635 must be set to a  
different IR Code Group number, so that Volume, Mute, Balance and Standby ON/OFF in each room can be  
adjusted independent of the others. To make Code Group changes, refer to the RC68+ Programmer  
Instructions.  
NOTE: When shipped from the factory, all amplifier pairs of the PA635 are set to Code Group number  
B0. You may, for example, leave the #1 amplifier pair at B0 and change the other two to C0 and D0,  
etc. Just be sure not to use a group number that is used by any other Xantech product connected on  
the same IR bus (e.g. #20 used on the RS41AV).  
© 2001 Xantech Corporation.  
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Model PA635  
Page 13  
CONTROLLED SOURCE COMPONENTS  
Cassette DecK  
CD Changer  
Satellite Receiver  
AM/FM Tuner  
L
R
L
R
L
R
V
L
R
286M Dual Blink-IR™  
Mouse Emitters (2)  
RCA type Patch Cords  
IR Signal  
6015900  
To Video Distribution (if used)  
3.5mm to-stripped-ends  
mono cable (7)  
RS41AV  
1
2
3
4
RS41AV  
Audio/Video  
VIDEO  
REMOTE SWITCHER  
IR  
Remote Switcher  
CONFIRM  
®
EMITTERS  
SYLMAR, CA  
MADE IN U.S.A.  
AUDIO  
LEFT  
789-44  
CONNECTING BLOCK  
782  
Type  
Power  
Supply  
®
AUDIO  
RIGHT  
POWER 15VAC  
V
V
G
IR IN  
RS41AV  
Power  
Supply  
INPUT  
OUTPUT  
IR  
RCVR  
12VDC  
White  
striped  
side  
To AC MAINS  
(Unswitched)  
To AC MAINS  
(Unswitched)  
PA635 (rear panel)  
COMMON  
AUDIO  
BUS  
WARNING  
WARNING  
FUSE  
LEFT  
RIGHT  
LEFT  
RIGHT  
LEFT  
RIGHT  
LEFT  
RIGHT  
6.25 AMP  
TURN POWER  
OFF BEFORE  
CHANGING  
MODES  
TURN POWER  
OFF BEFORE  
CHANGING  
MODES  
1
2
3
CAUTION  
SLOW BLOW  
MODE  
MODE  
MODE  
REMOTE  
MASTER  
ON/OFF  
RISK OF ELECTRIC  
SHOCK. DO NOT OPEN  
COMMON  
LOCAL  
COMMON  
LOCAL  
COMMON  
LOCAL  
STEREO  
STEREO  
STEREO  
LEVEL  
RESET  
MONO  
MONO  
MONO  
BRIDGED  
BRIDGED  
BRIDGED  
CONTROL  
AC 120V  
60 HZ  
2
AMP  
--  
+
+
BRIDGED --  
+
BRIDGED --  
+
BRIDGED --  
SPEAKER  
SPEAKER  
SPEAKER  
LEFT  
+
5-30 VOLTS DC  
LEFT  
LEFT  
-- -R- IGHT  
+
+
-- -R- IGHT  
+
-- -R- IGHT  
+
AC LINE  
ON/OFF  
®
+
TO ROOM 1  
SPEAKERS  
TO ROOM 3  
SPEAKERS  
TO ROOM 2  
SPEAKERS  
IR  
To AC MAINS  
(Unswitched)  
+12V  
CB18  
Parallel Connecting Block  
+12 VDC  
IR  
1
2
3
4
5
6
7
8
9
GND  
GND  
L
R
L
R
V
G
ST  
IR  
V
G
ST  
IR  
Smart  
Pad3™  
Smart  
Pad3™  
ROOM 3  
ROOM 1  
L
R
V
G
ST  
IR  
780-80  
"J" Box  
IR Receiver  
ROOM 2  
Figure 8 – Basic PA635 and RS41AV System – Requires Room-Dedicated Remotes  
© 2001 Xantech Corporation  
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Page 14  
Model PA635  
CAUTION: When changing the group numbers, you must connect an IR receiver to each amplifier pair's IR  
input (item 11, Fig. 3) one at a time. You cannot use the Common IR Input (item 15, Fig. 3) as this will  
change them all to a different, but same number.  
7. After the Code Groups are set up, "teach" volume and other commands from the RC68+ Programmer (Fig. 4)  
into learning remote controls (and the keypads) dedicated to each room. Be sure to set the RC68+ to the  
specific Code Group Number that corresponds to the ones chosen for each of the amplifier pairs, during this  
"teaching" process.  
NOTE: With a Common IR Bus system, you cannot carry the same remote control from room-to-  
room. You must use a dedicated learning remote (such as the Xantech URC versions) for each room  
into which you have "taught" the specific RC68+ Code Group that operates the specific PA635  
Amplifier Pair that controls the volume, etc., for that room!  
If you wish to carry remotes that have the same codes from room-to-room, that is, Non-Dedicated Remotes,  
use the IR System shown in Fig. 9.  
8. To keep the system cost low, no AC power management is included. The user would need to operate the  
power switching for each component individually, using front panel power switches, or IR, as appropriate.  
Individual room Standby ON/OFF is provided, however. The STATUS of Standby ON/OFF is indicated at the  
IR receivers and keypads via the STATUS line connection to each room, as shown.  
9. This system is primarily set up to distribute music to each room. A video feed to a single room could also be  
done at low cost. However, video distribution to all rooms would add additional layers of complexity and cost  
that would best be handled by a ZPR68-10.  
10. When connecting speakers for each room, be sure to observe correct polarities as shown in Fig. 6.  
A Basic Dedicated IR System - Non-Dedicated Keypads and Remotes.  
A typical system of this type is shown in Fig. 9, where each remote room has a Dedicated IR path going to the  
PA635 amplifier pair that controls it. The IR bus is not connected in common as it is in Fig. 8. It eliminates the  
need for dedicated remotes, allowing you to carry the same remote(s) from room-to-room - that is, remote  
commands for Volume, Mute, etc., will work in any room from the same remote.  
This system is similar in many respects to the previous system (Fig. 8), but differs as follows:  
1. A 796-20 Six Zone Connecting Block is used to "zone" individual IR control signals to each amplifier pair of  
the PA635 for Volume, Mute, Balance and Standby ON/OFF action in each room. It also carries a  
"COMMON" IR signal to a 789-44 Connecting Block for control of the RS41AV Remote Switcher and the  
Source Components.  
2. Note that the ZONE numbers on the 796-20 do not agree with the room or amplifier pair numbers. This is of  
no consequence; it is only necessary that each room's keypad or IR receiver connects to a different ZONE IR  
INPUT on the 796-20.  
3. Since the 796-20 channels the IR from each room to it's specific PA635 amplifier pair, each amplifier pair can  
use the same IR Code Group (the factory default B0).  
4. While use of the 796-20 entails some added expense, it reduces programming time for both the hand-held  
remotes and the keypads, in addition to providing additional convenience to the user.  
5. The desired volume and other commands from the RC68+ Programmer (see Fig. 4) need to be "taught" into  
learning remote controls (such as the Xantech URC types) and Smart Pads used in the system, either directly  
or by using Dragon Drop IR™.  
© 2001 Xantech Corporation.  
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Model PA635  
Page 15  
CONTROLLED SOURCE COMPONENTS  
Cassette DecK  
CD Changer  
Satellite Receiver  
AM/FM Tuner  
L
R
L
R
V
L
R
L
R
286M Dual Blink-IR™  
Mouse Emitters (2)  
RCA type Patch Cords  
IR Signal  
To Video Distribution (if used)  
RS41AV  
1
2
3
4
RS41AV  
Audio/Video  
VIDEO  
REMOTE SWITCHER  
IR  
Remote Switcher  
CONFIRM  
®
EMITTERS  
SYLMAR, CA  
MADE IN U.S.A.  
AUDIO  
LEFT  
789-44  
782  
Type  
Power  
Supply  
CONNECTING BLOCK  
®
AUDIO  
RIGHT  
POWER 15VAC  
V
V
G
IR IN  
RS41AV  
Power  
Supply  
INPUT  
OUTPUT  
IR  
RCVR  
12VDC  
White  
striped  
side  
To AC MAINS  
(Unswitched)  
To AC MAINS  
(Unswitched)  
6015900  
3.5mm to-stripped-ends  
mono cable (7)  
PA635 (rear panel)  
COMMON  
AUDIO  
BUS  
WARNING  
WARNING  
FUSE  
LEFT  
RIGHT  
LEVEL  
LEFT  
1
RIGHT  
LEFT  
RIGHT  
LEFT  
RIGHT  
6.25 AMP  
TURN POWER  
OFF BEFORE  
CHANGING  
MODES  
TURN POWER  
OFF BEFORE  
CHAGING  
MODES  
2
3
CAUTION  
SLOW BLOW  
MODE  
MODE  
MODE  
REMOTE  
MASTER  
ON/OFF  
RISK OF ELECTRIC  
SHOCK. DO NOT OPEN  
COMMON  
LOCAL  
COMMON  
LOCAL  
COMMON  
LOCAL  
STEREO  
STEREO  
STEREO  
MONO  
MONO  
MONO  
RESET  
BRIDGED  
BRIDGED  
BRIDGED  
CONTROL  
AC 120V  
60 HZ  
2
AMP  
--  
+
+
BRIDGED --  
+
BRIDGED --  
+
BRIDGED --  
SPEAKER  
SPEAKER  
SPEAKER  
LEFT  
+
5-30 VOLTS DC  
LEFT  
LEFT  
-- -R- IGHT  
+
+
-- -R- IGHT  
+
-- -R- IGHT  
+
AC LINE  
ON/OFF  
®
+
TO ROOM 2  
SPEAKERS  
TO ROOM 1  
SPEAKERS  
TO ROOM 3  
SPEAKERS  
796-20  
â SYLMAR CA, MADE IN U.S.A.  
SIX ZONE CONNECTING BLOCK / EXPANDER  
ZONE EMITTERS  
ZONE EMITTERS  
ZONE IR INPUTS  
ZONE IR INPUTS  
ZONE 6 ZONE 5 ZONE 4  
+12 IN +12 IN  
ZONE 9  
ZONE 8  
ZONE 7 COMMON  
+12 IN  
G
+12 IN  
G
+12 IN  
G
+12 OUT  
G
G
G
+12 IN  
G
ZONE 4  
ZONE 5  
ZONE 6  
ZONE 7  
ZONE 8  
ZONE 9  
To AC MAINS  
(Unswitched)  
A
B
A
B
A
B
A
B
A
B
A
B
GND  
IR  
+12 VDC  
L
R
L
R
V
G
ST  
IR  
V
G
ST  
IR  
Smart  
Pad3™  
Smart  
Pad3™  
L
R
ROOM 3  
ROOM 1  
V
G
ST  
IR  
780-80  
"J" Box  
IR Receiver  
ROOM 2  
Figure 9 – Basic PA635, RS41AV and 796-20 System – Uses Non-Dedicated Room Remotes  
© 2001 Xantech Corporation  
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Page 16  
Model PA635  
Connecting the REMOTE MASTER ON/OFF CONTROL Terminals  
As mentioned under "PA635 PANEL AND FEATURE DESCRIPTIONS", the REMOTE MASTER ON/OFF  
CONTROL terminals allow the power to the entire PA635 to be turned ON and OFF by a remotely applied DC  
Voltage. Fig. 10 is a typical applications using this feature.  
Using a DC Power Adapter as a Control Voltage  
Fig. 10 illustrates how a PA635 can be switched ON and OFF via the switched AC outlet on the rear of a  
preamplifier or other control center. When the preamplifier Power Switch is switched ON, power is applied to the  
DC adapter which in turn applies 5 V to 30 VDC to the PA635, switching it ON. Similarly, when the preamplifier is  
switched OFF, the DC voltage to the PA635 is removed, turning it OFF.  
CAUTION: The output voltage of some adapters, such as the 781RG, drops off too slowly to provide a quick  
turnoff for the PA635. 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)  
PA635  
(portion of rear panel)  
Preamplifier, Control Center, etc.  
COMMON  
AUDIO  
BUS  
WARNING  
LEFT  
RIGHT  
TURN POWER  
OFF BEFORE  
CHANGING  
MODES  
REMOTE  
MASTER  
ON/OFF  
LEVEL  
RESET  
(+)  
CONTROL  
--  
+
5-30 VOLTS DC  
®
5V to 12 VDC Adapter,  
such as a Xantech 781RG,  
plugged into a Switched  
AC Outlet on Preamplifier  
CAUTION:  
You must use the included  
220 ohm resistor.  
Figure 10 – Using the Remote Master On/Off Control Terminals  
A Multi-Zone Power Managed System, using a ZPR68, a GATEKEEP-IR and a PA635  
Fig. 10 shows a PA635 in a typical multi-room system with a Xantech ZPR68-10 six-zone preamp and a  
GATEKEEP-IR. The PA635 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 PA635.  
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 PA635.  
© 2001 Xantech Corporation.  
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Model PA635  
Page 17  
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  
PA635. Similarly, when the last zone is turned OFF, the CO drops to 0 V, turning the PA635 totally OFF.  
NOTE: No IR control of the PA635 is used in the system shown in Fig. 11. All volume, mute, etc. functions are  
handled by IR control of the ZPR68-10. The PA635 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 PA635 is controlled via the STATUS and CO functions as noted above.  
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).  
CAUTION: When powering up multiple PA635’s, a delay of 2 or more seconds should be incorporated between  
“power on” using multiple Xantech AC2’s.  
© 2001 Xantech Corporation  
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Page 18  
Model PA635  
TROUBLE SHOOTING  
If you encounter a problem, please review the items in the following list. Be sure, in addition, to check other  
system components, such as preamplifiers, CD players, speakers, speaker wiring, etc., that may be at fault.  
PROBLEM  
PROBABLE CAUSE AND SOLUTION  
Front Panel LEDs and rear panel power indicator does  
not light – no sound.  
Check line cord for good contact in a live AC outlet. If  
the REMOTE MASTER ON/OFF CONTROL terminals  
(item #13, Fig. 3) are used, be sure applied voltage is  
between +5 V and +30 VDC with proper polarity. Refer  
to Fig. 10.  
Low level or no sound when operated without IR  
control.  
Level was previously set by IR to a low level or muted.  
Simply press LEVEL (System) RESET button as  
instructed in item 9, Fig. 3.  
Sound cuts in and out every 3 to 5 seconds.  
Speaker load impedance is less than 4-Ohms for  
Stereo mode or less than 8-Ohms for Bridged mode.  
Make changes in matching auto-formers and/or  
speakers as necessary to obtain higher impedance.  
PA635 does not turn OFF when REMOTE input voltage Be sure that the POWER switch (item 3, Fig. 2) is set  
goes to 0 Volts.  
to the MANUAL OFF (Out) position.  
PA635 becomes very warm, shuts OFF, but does not  
come back ON automatically.  
Set POWER switch (item 3, Fig. 2) to MANUAL OFF  
(OUT) position for 15 seconds, then back ON. If the  
REMOTE MASTER ON/OFF CONTROL terminals are  
used, unplug for 15 seconds, then re-plug.  
Unit responds intermittently or not at all to IR  
commands.  
Look for IR noise at the IR receiver locations in the  
various rooms. Also, long lengths of shielded wire from  
keypads or IR receivers can cause poor IR executions.  
Refer to the troubleshooting sections of the IR receiver  
and keypad manuals you are using.  
The PA635 blew its fuse (item #10, Fig. 3) as power  
The supplied 220 Ohm resistor may not have been  
was turned OFF using an adapter driving the REMOTE connected in shunt with the REMOTE MASTER  
MASTER ON/OFF CONTROL terminals.  
ON/OFF CONTROL terminals. Be sure this resistor is  
connected and that the leads are making secure  
contact within the screw terminals of the connector.  
Refer to CAUTION notes, Fig. 9  
© 2001 Xantech Corporation.  
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Model PA635  
Page 19  
PA635 SPECIFICATIONS  
Number of channels  
6
Power Output  
Rated continuous power, each channel, all six channels  
simultaneously driven, 20 Hz to 20kHz, at rated THD  
35 Watts at 8 Ohms  
Power Output  
Short term continuous, each channel, 2 channels driven,  
1 kHz, at rated THD  
55 Watts at 8 Ohms  
80 Watts at 4 Ohms  
Bridged Power Output  
Short term continuous, one pair driven at 1 kHz, at rated THD  
150 Watts at 8 Ohms  
Rated THD  
< 0.08%  
> 100  
Damping Factor  
at 50 Hz, half rated power  
S/N Ratio  
A-weighted, shorted inputs, ref to rated power  
> 100 dB  
Frequency Response  
at 1 Watt, ± 3dB  
12 Hz to 55 kHz  
Input Sensitivity  
at rated power, stereo mode, input gain (IR controlled setting)  
Max: 0.5 V  
Default: 1.0 V  
Minimum: Off  
Input Impedance  
Power Source  
Local Inputs: 22 kOhms  
Common Audio Bus Inputs: 70 kOhms  
120 VAC, 60 Hz  
TMRA 30° Celsius. If this temperature is exceeded, you will  
need to provide additional ventilation to ensure proper  
operation.  
240 VAC, 50 Hz (European version)  
Power Consumption  
No signal: 20 Watts  
6 Channels at 1/10 rated power: 150 Watts  
6 Channels at rated power: 600 Watts  
6 Channels Bridged at 660 Watts  
Remote On/Off and  
+5 V to +30 VDC (16 mA at +12 VDC)  
CI Voltage/Current  
Line Fuse Rating  
Dimensions  
Weight  
120 V version: 6.25 A Slow Blow 250 VAC  
240 V version: 3.15 A Time-Lag 250 VAC  
19” W x 3.5” H x 15.5” D  
(483 mm W x 89 mm H x 394 mm D)  
22.4 lbs (10.2 kg)  
© 2001 Xantech Corporation  
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Page 20  
Model PA635  
Part No. 08901150 Rev A 01-02-2002  
© 2001 Xantech Corporation.  
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