Xantech PA1235X User Manual

TABLE OF CONTENTS

INSTALLATION INSTRUCTIONS

MODEL PA1235X

12 CHANNEL POWER AMPLIFIER

Section Title

SAFETY INSTRUCTIONS....................................................................................................................................2

GENERAL INFORMATION...................................................................................................................................3

PA1235X PANEL AND FEATURE DESCRIPTIONS .............................................................................................4

INSTALLATION

Physical Location And Mounting...............................................................................................................7

Connecting The PA1235X........................................................................................................................8

Stereo Mode Connections........................................................................................................................8

Speaker Phasing......................................................................................................................................9

Bridged Mode Connections ......................................................................................................................9

Connecting The Remote On/Off Jack .....................................................................................................10

A Typical Multi-Zone System Diagram Using A PA1235X .......................................................................11

TROUBLE SHOOTING ......................................................................................................................................12

SPECIFICATIONS .............................................................................................................................................13

Page

Page 2 Model PA1235X

SAFETY INSTRUCTIONS - READ BEFORE OPERATING EQUIPMENT

CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK,

DO NOT REMOVE COVER (OR BACK)

NO USER-SERVICEABLE PARTS INSIDE

REFER SERVICING TO QUALIFIED SERVICE PERSONNEL

The lightning flash with arrowhead symbol, within an equilateral triangle,
is intended to alert the user to the presence of un-insulated “dangerous
voltage” within the product’s enclosure that may be of sufficient magnitude
to constitute a risk of electric shock to persons.

The exclamation point within an equilateral triangle is intended to alert the
user to the presence of important operating and maintenance (servicing)
instructions in the literature accompanying the appliance.

WARNING

TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO
NOT EXPOSE THIS APPLIANCE TO RAIN OR MOISTURE.

This product was designed and manufactured to meet strict quality and safety standards. There are, however,
some installation and operation precautions, which you should be particularly aware of.

1. Read Instructions – All the safety and operating ins tr uc tions should be read bef ore the appliance is operated.

2. Retain Instructions – The safet y and operating instruc tions should be retained f or future ref erence.

3. Heed Warnings – All warnings on the appliance and in the operating instructions should be adhered to.

4. Follow Instructions – All operating and use instructions should be followed.

5. Water and Moisture – The appliance should not be used near water – for example, near a bathtub, washbowl, kitchen sink, laundry tub,

in a wet basement , or near a swimming pool, etc.

6. Carts and Stands – The appliance should be used only with a cart or stand that is recommended by the manufacturer. An appliance

and c art combination should be moved with care. Quic k s tops, excess ive f orce, and uneven surfaces may c aus e the appliance and cart
combination to overturn.

7. Wall or Ceiling Mounting – The appliance should be mounted to a wall or ceiling only as recommended by the manufacturer.

8. Ventilation – The appliance s hould be situat ed s o that its location or position does not interfere with its pr oper ventilation. For example,

the appliance should not be situated on a bed, sofa, rug, or similar s urface that may block the ventilation openings; or, plac ed in a built-in
installation, such as a bookcase or cabinet that may impede the flow of air through the ventilation openings.

9. Heat – The appliance s hould be situated away from heat sourc es such as radiators , heat registers, stoves, or other appliances (inc luding

amplifiers) that produc e heat.

10. Power Sources – The appliance should be connected to a power supply only of the type described in the operating instructions or as

marked on the appliance.

11. Grounding or Polarization – Precautions should be taken so that the grounding or polarization means of an appliance is not defeated.

12. Power-Cord Protection – Power- supply cords should be routed so that they are not likely to be walked on or pinched by items placed

upon or against them, paying particular attention to cords at plugs, convenience receptacles, and the point where they exit from the
appliance.

13. Cleaning – T he applianc e should be c leaned only as recommended by the manuf actur er.

14. Power Lines – An out door antenna should be located away fr om the power lines.

15. Nonuse Periods – The power cord of the appliance should be unplugged from the outlet when left unused for a long period of time.

16. Object and Liquid Entry – Care should be taken so that objects do not fall and liquids are not spilled into the enclosure through

openings .

17. Damage Requiring Service – The appliance should be serviced by qualified service personnel when:
A. The Power-supply cord or the plug has been damaged; or
B. Objects have fallen, or liquid has spilled into the appliance; or
C. T he applianc e has been exposed to rain; or
D. T he applianc e does not appear to operate normally or exhibits a marked change in perf ormance; or
E. The appliance has been dropped, or the enclosure damaged.

18. Servicing – The user should not attempt to service the appliance beyond that described in the operating instructions. All other servicing

should be referred to qualified service personnel.

© 2002 Xantech Corporation.

Model PA1235X Page 3

GENERAL INFORMATION

To enhance the ease of installation and obtain optimum performance from the PA1235X, we recommend that you
first become familiar with all its features and special capabilities by studying the descriptions and instructions in
this manual.

The PA1235X was designed to meet the audio power amplifier needs of custom installed multi-zoned systems
with high sonic quality. It's 12-11-10-9-8-7-6 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 PA1235X features twelve 35-watt power amplifiers. This permits each PA1235X to
drive 6-zones 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 individually 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 lev el 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 ov er-driving wall speakers, etc.).

123456

POWER

PA1235X

12 CHANNEL POWER AMPLIFIER

Figure 1 – The Model PA1235X

12-11-10-9-8-7-6 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 PA1235X added
use in many other applications, such as driving surround sound speaker systems in addition to multi-room:

x Twelve 35-watt amplifiers - 12 total.
x One 80 and ten 35-watt amplifiers - 11 total.
x Two 80 and eight 35-watt amplifiers - 10 total.
x Three 80 and six 35-watt amplifiers - 9 total.
x Four 80 and four 35-watt amplifiers - 8 total.
x Five 80 and two 35-watt amplifiers - 7 total.
x Six 80-Watt amplifiers - 6 total.

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 PA1235X if a short circuit 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.

© 2002 Xantech Corporation.

Page 4 Model PA1235X

Remote Master ON/OFF Jack. This jack allows the PA1235X 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 PA1235X's ON and OFF automatically
with zone ON/OFF commands.

PA1235X PANEL AND FEATURE DESCRIPTIONS

2 2

1

123456

123456

POWER

PA1235X

12 CHANNEL POWER AMPLIFIER

3

4

Figure 2 – The Model PA1235X Front Panel – Features and Functions

1. Front Panel. 19" X 5 ¼” 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 PA1235X [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 PA1235X ON and OFF. Refer to "REMOTE MASTER ON/OFF CONTROL" terminals,
item #10.

NOTE: The PA1235X may also be powered ON/OFF with an external AC line switch into which the power

cord of the PA1235X is plugged (such as the switched AC outlet of a preamp, timer, etc. with a 15 Amp
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 are off during normal operation.

If the amplifier is driven into distortion or clipping, they will indicate with a red color.

© 2002 Xantech Corporation.

Model PA1235X Page 5

8

5

LEFT RIGHT

LEVEL

+ BRIDGED --

SPEAKER

LEFT RIGHT

7 7

MODE

STEREO

MONO

BRIDGED

1

1V

.2V3V

+-- --+

LEFT RIGHT

LEVEL

+ BRIDGED --

SPEAKER

LEFT RIGHT

MODE

STEREO

BRIDGED

2

MONO

1V

7

.2V3V

+-- --+

WARNING

TURN POWER
OFF BEFORE

CHANGING

MODES

REMOTE MASTER
ON/OFF CONTROL

5-30 VOLTS DC

+--

5

LEFT RIGHT

LEVEL

+ BRIDGED --

SPEAKER

LEFT RIGHT

MODE

STEREO

MONO

BRIDGED

1V

7

33

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

.2V3V

MAY CAUSE UNDESIRED
OPERATION.

+-- --+

55

LEFT RIGHT

LEVEL

+ BRIDGED --

SPEAKER

LEFT RIGHT

MODE

STEREO

BRIDGED

4

MONO

1V

.2V3V

+-- --+

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.

GROUND

5

LEFT RIGHT

LEVEL

+ BRIDGED --

SPEAKER

LEFT RIGHT

MODE

STEREO

MONO

BRIDGED

1V

7

5

REFER TO OWNERS
MANUAL FOR SAFETY
INSTRUCTIONS.

5

ATTENTION

POUR UN REGLAGE
CORRECT, SE
REPORTER AU
MANUEL
DINSTRUCTIONS.

.2V3V

+-- --+

WARNING

TURN POWER
OFF BEFORE

CHANGING

MODES

:

LEFT RIGHT

LEVEL

+ BRIDGED --

SPEAKER

LEFT RIGHT

MODE

STEREO

MONO

BRIDGED

7

MODEL PA1235X

6

1V

.2V3V

+-- --+

CAUTION

NEUTRAL
FUSING

AC 120V
60Hz 8.7A
1044 WATTS

AC LINE
ON/OFF

FUSE

10 AMP

SLOW BLOW

--

0

9

6

9

6

11

10

9

6

9

6

12

9

6

9

6

14

13

Figure 3 – PA1235X 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. 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. Normally you would adjust
the driving preamp to maximum volume, 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 W atts of output each.

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 (80 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 #9, following).

8. Fuse. When required, replace only with a fuse of the same type and rating:

x 120 V Version: 10 A 250 VAC, SLOW BLOW.
x 240 V Version: 5 A Time-Lag 250 VAC.
x 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.

© 2002 Xantech Corporation.

Page 6 Model PA1235X

CAUTION: W hen 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 PA1235X 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 PA1235X 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.

11. Rear Panel ON/OFF LED. This LED indicates the power ON/OFF condition of the entire PA1235X, whether

activated by a REMOTE MASTER ON/OFF CONTROL voltage (item #13) or from the front panel POWER
switch (item # 3).

12. 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., if needed.

13. Master AC LINE ON/OFF Switch. Turns power OFF to the entire PA1235X, regardless of Remote Master or

front panel POWER switch conditions. Must be placed in the ON (I) position for the other power switching
functions to work.

14. 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).

© 2002 Xantech Corporation.

Model PA1235X Page 7

INSTALLATION - PHYSICAL LOCATION AND MOUNTING

Upper shelf, component, wall, etc.

PA1235X

To maximize air flow, route
single large opening in lower shelf.

Keep perforations on top cover free of
obstructions for max. cooling effect.

Convection

Airflow

2-inch spacing
(minimum)

Keep perforations on bottom
plate free of obstructions.

Figure 4 – PA1235X Horizontal Mounting

When you mount the PA1235X, you should plan its location carefully. Pay close attention to each of the following
factors:

1. The amplifier is convection cooled. That is, 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. 4). 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 PA1235X'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
PA1235X'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 PA1235X
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 PA1235X 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.

© 2002 Xantech Corporation.

Page 8 Model PA1235X

CONNECTING THE PA1235X

VIDEO

L

AUDIO

R

1

LEFT RIGHT

1

MODE

STEREO

MONO

BRIDGED

1V

LEVEL

+ BRIDGED --

SPEAKER

LEFT RIGHT

Be sure speakers are

connected with correct

polarity as shown.

 +

.2V3V

+-- --+

Preamp Outputs

ZPR68, etc.

RCA Type

Patch Cords

Set MODE
Switch to

STEREO position

PA1235X

Rear Panel

WARNING

TURN POWER
OFF BEFORE

CHANGING

MODES

 +

PA1235X

Rear Panel

VIDEO

L

AUDIO

R

LEFT RIGHT

1

MODE

STEREO

MONO

BRIDGED

1V

LEVEL

+ BRIDGED --

SPEAKER

LEFT RIGHT

1

.2V3V

+-- --+

 +

Preamp Outputs

ZPR68, etc.

RCA Type

Patch Cords

WARNING

TURN POWER
OFF BEFORE

CHANGING

MODES

Be sure speakers are

connected with correct

polarity as shown.

Set MODE
Switchs to

BRIDGED position

LEFT RIGHT

2

MODE

STEREO

MONO

BRIDGED

1V

LEVEL

.2V3V

+ BRIDGED --

SPEAKER

LEFT RIGHT

+-- --+

 +

Wall speakers,

shelf speakers, etc.

Left Right

Left Right

Wall speakers,

shelf speakers, etc.

Figure 5 - PA1235X Stereo Mode Connections Figure 6 – Bridged Mode Connections

When making connections to the PA1235X be sure the power cord is unplugged. Proceed as follows:

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 PA1235X. Do this for each amplifier pair. Refer to Fig. 5.

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 PA1235X as shown.

4. The PA1235X 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 PA1235X
to the corresponding "+" and "–" terminals on each speaker. This will ensure correct "phasing". See Figure 5
and Speaker Phasing, following. Since the connectors are removable, you may unplug them for ease of lead
assembly.

© 2002 Xantech Corporation.

Model PA1235X Page 9

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.

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. 5 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
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 for 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 PA1235X and the
speakers as shown in Fig. 6. Be sure to use only the two outer terminals marked "+” and "–" on the 4­terminal connector as shown on the panel for BRIDGED connections.

NOTE: Only one speaker is connected per amplifier pair in the BRIDGED mode!

CAUTION: W hen 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.

in multi-room applications where

Connecting the REMOTE ON/OFF Jack

As mentioned under "PA1235X PANEL AND FEATURE DESCRIPTIONS", the REMOTE ON/OFF jack allows the
power to the PA1235X to be turned ON and OFF by a remotely applied DC Voltage. Fig. 7 illustrates how a

© 2002 Xantech Corporation.

Page 10 Model PA1235X

PA1235X 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 PA1235X, switching it ON. Similarly, when the preamplifier is switched OFF, the DC voltage to the
PA1235X is removed, turning it OFF.

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

LEFT RIGHT

Preamplifier, Control Center, etc.

5V to 12 VDC Adapter,

such as a Xantech 781RG,

plugged into a Switched

AC Outlet on Preamplifier

Figure 7 – Using the PA1235X Remote Master On/Off Control Terminals

2

MODE

STEREO

MONO

BRIDGED

.2V3V

+-- --+

You must use the included

220 ohm resistor.

REMOTE MASTER
ON/OFF CONTROL

(+)

5-30 VOLTS DC

+--

CAUTION:

1V

LEVEL

+ BRIDGED --

SPEAKER

LEFT RIGHT

PA1235X

(portion of rear panel)

LEFT RIGHT

33

MODE

STEREO

MONO

BRIDGED

1V

LEVEL

.2V3V

+ BRIDGED --

SPEAKER

LEFT RIGHT

+-- --+

© 2002 Xantech Corporation.

Model PA1235X Page 11

A Multi-Zone System Diagram Using The PA1235X

Fig. 8, following, shows the PA1235X in a typical multi-room system with a Xantech ZPR68-10 Six-Zone Preamp.

In this case, the common +12V CO (control output) from the ZPR68-10 is used to remotely turn the PA1235X On
and Off. When any one of the zones is turned on, the common +12V CO goes high, turning the PA1235X On.
Similarly, when the last zone is turned OFF, the +12V CO drops to 0V and turns the PA1235X Off.

CAUTION: When powering up multiple PA1235X’s, a delay of 2 or more seconds should be incorporated
between “power on” using multiple Xantech AC2’s.

RF Signal
IR Signal

ZPR68-10 Power
Supply

RF IN

TV

L

780-80

"J" Box

IR Receiver

ZONE 2

XANTECH

S-62/64/66

Wall Speakers

L

Smart

Pad



2

ZONE 1

ZPR68-10

SIX ZONE EIGHT SOURCE REMOTE PREAMP

COMMON IR LEVEL

12345678

HI
LO

1 2 3 4 5 6 7 8

IR CONFIRM

VIDEO

COM
PORT

L

AUDIO

POWER

R

CO

G

POWER
SUPPLY

Plug SAT Rec'rs into

120 V AC (u

nswitch

ed)

SAT Rec'r #1

To Zone IR Out 1,

ZPR68-10

SAT Rec'r #2

To Zone IR Out 2,

ZPR68-10

VCR #1

To Zone IR Out 3,

ZPR68-10

VCR #2

To Zone IR Out 4,

ZPR68-10

XANTECH

S-62/64/66

R

L

Wall Speakers

Smart

Pad

2



ZONE 4

VIDEO IN

TV

R

COMMON IR INDICATOR

LR

COMMON IR OUTPUTS

SOURCE INPUTS

AM/FM Tuner

12345678

V

Common IR Out 1,

To

Common IR Out 4,

ZPR68-10

CD Changer

V

V

V

LR

V

LR

V

LR

SOURCE COMPONENTS

A/V

Patch Cords

To

ZPR68-10

To

Common IR Out 2,

ZPR68-10

DVD Player

LR

To

Common IR Out 3,

ZPR68-10

LD Player

LR

L

LR

LR

283M

Blink-IR
Mouse
Emitter (8)

Smart

Dinky Link

Pad



2

IR Receiver

ZONE 3

LEFT RIGHT1LEFT RIGHT2LEFT RIGHT33LEFT RIGHT4LEFT RIGHT5LEFT RIGHT

LEVEL

LEFT RIGHT

R

R

4-Conductor
Home Runs.

CAUTION

See

"POWER SUPPLY

CONSIDERATIONS"

in ZPR68-10

Manual, page 10.

ZONE CONTROL - IR INPUTS

123456

LEVEL

LEFT RIGHT

ZONE IR OUTPUTS

ZONE OUTPUTS

Remote

ON/OFF

WARNING

MODE

STEREO

TURN POWER
OFF BEFORE

MONO

CHANGING

BRIDGED

MODES

REMOTE MASTER

1V

ON/OFF CONTROL

LEVEL

5-30 VOLTS DC

.2V3V

+ BRIDGED --

SPEAKER

ZONE 2 ZONE 3 ZONE 4 ZONE 5 ZONE 6

+-- --+

+ BRIDGED --

+--

LEFT RIGHT

To Speakers in Rooms

+ BRIDGED --

ZONE 1

SPEAKER

480-00

MODE

STEREO

MONO

BRIDGED

1V

.2V3V

+12V

GND

STATUS

IR IN

VIDEO

L

AUDIO

R

2-Conductor

Mini-Plug-

to-Stripped

Ends. Use

6015900.

+-- --+

SYLMAR, CA  MADE IN U.S.A.

®

A/V

Patch Cords

MODE

THIS DEVICE COMPLIES

STEREO

WITH PART 15 OF THE

MONO

FCC RULES.

BRIDGED

OPERATION IS SUBJECT
TO THE FOLLOWING
TWO CONDITIONS: (1)
THIS DEVICE MAY NOT
CAUSE HARMFUL
INTERFERENCE, AND (2)

1V

THIS DEVICE MUST
ACCEPT ANY
INTERFERENCE
RECEIVED,
INCLUDING
INTERFERENCE THAT

.2V3V

MAY CAUSE UNDESIRED
OPERATION.

SPEAKER

+-- --+

LEVEL

+ BRIDGED --

LEFT RIGHT

L

L

MODE

STEREO

MONO

BRIDGED

1V

SPEAKER

ZONE AMPLIFIER - MODEL PA1235X

RF IN

TV

R

Smart
Pad



2

ZONE 5

VIDEO IN

TV

R

Smart
Pad



2

ZONE 6

RF (TV)

Signal.

Use
RG-6
Coax

Base
Band

Video.

Use
RG-6
Coax

ANT. or

Cable

2-Way

RF

Amp

Combiner

Modulator

(2-Input)

LEVEL

LEFT RIGHT

PART NO. 03049720-001

MODEL PA1235X

6

MODE

FUSE

STEREO

10 AMP

MONO

SLOW BLOW

BRIDGED

CAUTION

NEUTRAL
FUSING

AC 120V

1V

60Hz 8.7A
1044 WATTS

.2V3V

+ BRIDGED --

SPEAKER

AC LINE
ON/OFF

+-- --+

--

0

REFER TO OWNERS
MANUAL FOR SAFETY
INSTRUCTIONS.

WARNING

MODE

WARNING

: TO REDUCE

STEREO

THE RISK OF FIRE OR
ELECTRICAL SHOCK, DO
NOT EXPOSE THIS UNIT TO
RAIN, MOISTURE OR PLACE
WATER FILLED OBJECTS ON
THE PRODUCT.

ATTENTION

CHOC ELECTRIQUE
NE PAS OUVRIR.

NO USER SERVICABLE

.2V3V

PARTS INSIDE.

+-- --+

TURN POWER
OFF BEFORE

MONO

CHANGING

BRIDGED

MODES

ATTENTION

:

POUR UN REGLAGE

1V

CORRECT, SE

: RISQUE DE

REPORTER AU
MANUEL

LEVEL

DINSTRUCTIONS.

.2V3V

+ BRIDGED --

SPEAKER

LEFT RIGHT

GROUND

+-- --+

Figure 8 – Typical Multi-Room System with a PA1235X and a ZPR68-10

© 2002 Xantech Corporation.

Page 12 Model PA1235X

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

Rear panel Power Indicator does not light – no sound. Check line cord for good contact in a live AC outlet. If

REMOTE ON/OFF jack is used, be sure applied
voltage is between +5V and +30V DC with proper
polarity. See Fig. 7.

No sound from CH2, CH4 or CH6 when stereo
operation is desired.

Sound cuts in and out every 3 to 5 seconds. Speaker load impedance is less than 4-Ohms for

PA1235X does not turn OFF when REMOTE input
voltage goes to 0 Volts.

PA1235X becomes very warm, shuts OFF, but does
not come back ON automatically.

One or more front panel LED’s glow red. The amplifier has been driven into clipping and/or is

BRIDGED/STEREO switch is incorrectly set to
BRIDGED position. Set to STEREO position. See
Fig. 6.

Stereo mode or less than 8-Ohms for Bridged mode.
Make changes in speakers as necessary to obtain
higher impedance.

Be sure that the POWER switch (item 3, Fig. 2) is set
to the MANUAL OFF (REMOTE ON/OFF) position.

Set POWER switch (item 3, Fig. 2) to MANUAL OFF
(OUT) position for 15 seconds, then back ON. If
REMOTE ON/OFF jack is used, unplug for 15 seconds,
then re-plug.

overheating. Correct faulty condition.

© 2002 Xantech Corporation.

Model PA1235X Page 13

SPECIFICATIONS

Number of channels

Power Output

Rated continuous power, each channel, all 12 channels
simultaneously driven, 20 Hz to 20kHz, at rated THD

Power Output

Short term continuous, each channel, 2 channels driven,
1 kHz, at rated THD

Bridged Power Output

Short term continuous, one pair driven at 1 kHz, at rated THD

Rated THD

Damping Factor

at 50 Hz, half rated power

S/N Ratio

A-weighted, shorted inputs, ref to rated power

Frequency Response

at 1 Watt, ± 3dB

Input Sensitivity

at rated power, stereo mode

12

35 Watts at 8 Ohms

55 Watts at 8 Ohms
80 Watts at 4 Ohms

150 Watts at 8 Ohms (80 Watts continuous)

< 0.08%

> 100

> 100 dB

12 Hz to 55 kHz

Max: 0.5 V
Default: 1.0 V
Minimum: Off

Input Impedance

Power Source

Power Consumption

Remote On/Off and
CI Voltage/Current

Line Fuse Rating

Dimensions

Weight

Local Inputs: 22 kOhms

120 VAC, 60 Hz
240 VAC, 50 Hz (European version)

No signal: 30 Watts (0.25/0.13 A)
12 Channels at 1/10 rated power: 360 Watts (3.0/1.5 A)
12 Channels at rated power: 1044 W atts (9.1/4.6 A)
6 Channels Bridged at 8.5 Watts/Chan: 720 Watts (6.0/3.0 A)

+5 V to +30 VDC (16 mA at +12 VDC)

120 V version: 10 A Slow Blow 220 VAC.
TMRA 30° Celsius. If this temperature is exceeded, you will
need to provide additional ventilation to insure proper
operation.

240 V version: 5 A Time-Lag 250 VAC

19” W x 5.25” H x 15.5” D
(483 mm W x 133 mm H x 394 mm D)

36.85 lbs (16.7 kg)

© 2002 Xantech Corporation.

Page 14 Model PA1235X

© 2002 Xantech Corporation.

Model PA1235X Page 15

© 2002 Xantech Corporation.

XANTECH CORPORATION

12950 Bradley Avenue, Sylmar CA 91342-3829

phone [phone] • fax [phone]

www.xantech.com

Part No. 08901240 Rev B 03-18-2002