Xantech PA1235X User Manual

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TABLE OF CONTENTS
INSTALLATION INSTRUCTIONS
MODEL PA1235X
12 CHANNEL POWER AMPLIFIER
Section Title
SAFETY INSTRUCTIONS....................................................................................................................................2
GENERAL INFORMATION...................................................................................................................................3
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.
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