Xantech PA435X User Manual 2

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INSTALLATION INSTRUCTIONS

MODEL PA435X

FOUR CHANNEL POWER AMPLIFIER

TABLE OF CONTENTS

 

SectionTitle

Page

SAFETY INSTRUCTIONS - READ BEFORE OPERATING EQUIPMENT.........................................................................................................

2

GENERAL INFORMATION .............................................................................................................................................................................

3

PA435X PANEL AND FEATURE DESCRIPTIONS ..........................................................................................................................................

5

INSTALLATION - PHYSICAL LOCATION AND MOUNTING ............................................................................................................................

8

CONNECTING THE PA435X ..........................................................................................................................................................................

9

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

9

Speaker Phasing..................................................................................................................................................

10

Mono Mode Connections......................................................................................................................................

10

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

11

Connecting the REMOTE MASTER ON/OFF MUTE CONTROL...........................................................................

12

A Multi-Zone System Diagram Using The PA435X and MRC88 ............................................................................

13

TROUBLE SHOOTING .................................................................................................................................................................................

15

SPECIFICATIONS ........................................................................................................................................................................................

16

Page 2

Model PA435X

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 instructions should be read before the appliance is operated.

2.Retain Instructions – The safety and operating instructions should be retained for future reference.

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 cart combination should be moved with care. Quick stops, excessive force, and uneven surfaces may cause 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 should be situated so that its location or position does not interfere with its proper ventilation. For example, the appliance should not be situated on a bed, sofa, rug, or similar surface that may block the ventilation openings; or, placed 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 should be situated away from heat sources such as radiators, heat registers, stoves, or other appliances (including amplifiers) that produce 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 – Powersupply 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 – The appliance should be cleaned only as recommended by the manufacturer.

14.Power Lines – An outdoor antenna should be located away from 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.The appliance has been exposed to rain; or

D.The appliance does not appear to operate normally or exhibits a marked change in performance; 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.

©2003 Xantech Corporation

Model PA435X

Page 3

GENERAL INFORMATION

To enhance the ease of installation and obtain optimum performance from the PA435X, we recommend that you first become familiar with all its features and special capabilities by studying the descriptions and instructions in this manual.

The PA435X was designed to meet the audio power amplifier needs of custom installed multi-zoned systems with high sonic quality. It is a 4 Channel amplifier that is primarily intended to interface with the MRC88 Whole-house Audio Video Entertainment System for Zones 7 and 8 Preamp outputs or for Sub-Zone amplification of zones 1-6. It may also be used as a standalone single or 2-zone amplifier. Specific features and technology are as follows:

Figure 1: The Model PA435X Amplifier

Cost/Size Efficiency. The PA435X features four 35-watt power amplifiers. This permits each PA435X to drive 2- zones in a multi-zone system -- each with a 35-watt stereo amplifier per zone.

4-3-2 Output Flexibility. Either pair of amplifiers can be bridged to allow several channel and power output capabilities. It can be configured into three power packages as follows:

Four 35-watt amplifiers. (4 Mono speaker outputs or 2 Stereo Zone outputs)

One 70 and two 35-watt amplifiers. (1 Mono 70 Watt and 1 Stereo 35-watt output)

Two 70-watt amplifiers (single Zone Stereo 70-watt output)

Remote ON/OFF Control Jacks (C1 & C2). These 3.5mm Stereo Mini Jacks allow the PA435X to be powered on and off and muted by a positive DC voltage ranging between 4 and 30 volts (11mA @ 12 V). Specifically, when interfaced with the Control Out jacks of zones 7 & 8 on the MRC88 (labeled CO1 and CO2), it permits the MRC88 to power the PA435X ON and OFF automatically with zone ON/OFF commands.

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 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.). When set to the 1:30 position, this will match the sensitivity level of the standard Amplifier output setting of the MRC88.

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.

© 2003 Xantech Corporation

Page 4

Model PA435X

Peak/Clip LED Indication: Whenever either amplifier channel output starts to enter a clipping state, a front panel LED will illuminate RED. After the amp stops clipping the LED will return to its normal state 5-6 seconds after clipping stops.

Auto Protection Circuit. This feature protects the PA435X if a short or very low impedance is detected at the speaker terminals with each amplifier pair protected separately. Normal operation is restored automatically within 3 to 4 seconds after the short is removed.

© 2003 Xantech Corporation

Model PA435X

Page 5

PA435X PANEL AND FEATURE DESCRIPTIONS

1.Front Panel . 17" X 3.5” panel designed for shelf mounting. The unit measures 4” high with the Feet (Item #5). When rack mounting use an adequate rack shelf mount making sure to allow for proper ventilation.

FIGURE 2 – THE MODEL PA435X FRONT PANEL – FEATURES AND FUNCTIONS

2. POWER/STANBY SWITCH:

POWER ON/OFF MODE: When the front switch is pressed to the IN position, the PA435X may be controlledremotely from the MRC88 leaving the amplifier in STANDBY MODE when any of the Zones are powered OFF via the CI1 and CI2 Control Inputs.

STANDBY MODE: When the front switch is the OUT position the amplifier may be totally controlled via the MRC88; turning the amp ON when either Zone of the MRC88 is powered up and powering the amp OFF when both Zones are OFF via the CI1 and CI2 Control Inputs.

NOTE: The rear power switch (Item #15) needs to be in the ON (I) position for both modes of operation

3. Status LED Indicators . These indicators, one for each channel pair, provide the following status information:

GREEN LED: Indicates Amplifier is ON

RED LED: Indicates associated channel output is in a CLIPPING state. LED will go back to GREEN 5-6 seconds after clipping subsides.

ALL LED’s OFF: Indicates both amplifier channels are OFF or in STANBY MODE (see Item #4 for STANDBY MODE)

4.Illuminated LOGO: This is a backlit logo. When lit it indicates that the amplifier is powered ON. If the individual STATUS LED’s (Item #3) are OFF but the LOGO is ON. This indicates that both amplifier channels are currently in STANDBY MODE. Whenever the LOGO is not illuminated, this indicates the amplifier is powered OFF.

5.Feet: Provides required ½” spacing when unit is shelf mounted to allow for proper ventilation. These feet should not be removed. (see the section entitled MOUNTING for further information)

©2003 Xantech Corporation

Xantech PA435X User Manual 2

Page 6

Model PA435X

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FIGURE 3 – PA435X REAR PANEL - FEATURES AND FUNCTIONS

6.Line Inputs. These RCA-type jacks are the audio inputs for each of the amplifier pairs. Connect them to the Preamp Output jacks of Zone 7 & 8 of the MRC88 (or other driving preamp output) with good quality RCA-type patch cables. Note that the inputs are marked LEFT-A-RIGHT, LEFT-B-RIGHT signifying the stereo channel pairs. Both the LEFT and RIGHT jacks are always active even when the MODE switch (item #8) is set to the MONO or BRIDGED mode.

7.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 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 unwanted power levels.

NOTE: To set the Input Level Control for matched output to the MRC88 Speaker output, set the Input Level Control on both pairs to the .7v (1:30) position as shown in Figure 4 below.

Matched MRC88 Setting

(0.7v = 1:30 position)

Figure 4: PA435X Level Adjustment setting when used with MRC88

8.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.

b.In MONO mode, left and right input signals are summed internally for Mono output from each of the two amplifiers. When interfacing a mono audio source, either the Left or Right (item #6) inputs may be used.

c.In BRIDGED mode, the two amplifiers are bridged for a single channel of high power output (70 Watts @ 8 Ohms). Either the Left or Right input (item #6) may be used to drive the resultant single channel amplifier.

©2003 Xantech Corporation

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