Xantech PA1235 Stereo Amplifier Installation instructions

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Xantech PA1235 Stereo Amplifier Installation instructions | Manualzz

INSTALLATION INSTRUCTIONS

PA1235

2 CHANNEL POWER AMPLIFIER

1 2 3 4 5 6

POWER

PA1235

12 CHANNEL POWER AMPLIFIER

Fig. 1

The Model PA1235

GENERAL INFORMATION

To enhance the ease of installation and obtain optimum performance from the PA1235, we recommend that you first become familiar with all its features and special capabilities by studying the descriptions and instructions in this manual.

The PA1235 was designed to meet the audio power amplifier needs of custom installed multi-room, multizoned systems with high sonic quality. Common and Local IR control of Volume, Mute, Balance and OFF, for each channel pair, is provided. It's bridgeable 12-11-10-9-8-7-6 multichannel capability permits a wide variety of uses, such as enough channels to run surround sound home theater and multi-room applications simultaneously. Specific features and technology are as follows:

• Cost/Size Efficiency.

The PA1235 features 12 conservatively rated 35-watt power amplifiers. This permits each PA1235 to drive 6-zones in a multi-zone system, each with a 35 watts/channel stereo amplifier per zone. The rack mountable low profile design, using a large single multiple filtered power supply, delivers high quality at a reasonable price.

• IR Controlled Volume Level.

Volume can be ramped from zero output to maximum for individual channel pairs, or, as group through the Common Bus inputs, using IR volume control commands from an RC68+ (or RC68). The maximum input sensitivity at full volume is 0.15 volts for rated output (35

Watts/chan.).

Local or Common Bus.

Each stereo pair can be fed audio individually via their LOCAL inputs from differing zones or sources. In addition, a single source can be fed, via the COMMON Bus, to some or all stereo pairs as desired. This flexibility permits the installer to drive as many as six rooms in stereo as a single zone system, or six rooms in stereo as a six zone system --- or divide them up for a combination of both.

Volume Setting Capabilities.

The installer has the option of using the volume control of the PA1235 as the sole volume control for a zone or the system, or to adjust the PA1235 volume to a desired fixed level and use the volume action of a connected preamp instead.

Max-V Setting.

This allows the amplifier to be set to deliver a controlled maximum sound level into a zone when the volume is ramped to maximum. This acts as a volume limiter for the system (e.g. to prevent the kids from over-driving wall speakers, etc.).

®

1

• 12-11-10-9-8-7-6 Output Flexibility.

Each of the 12 amplifiers can be driven singly or bridged to allow several channel and power output capabilities. It can be configured into seven power packages as follows:

- Twelve 35-watt amplifiers -

12

total.

- One 150 and ten 35-watt amplifiers -

11

total.

- Two 150 and eight 35-watt amplifiers -

10

total.

- Three 150 and six 35-watt amplifiers -

9

total.

- Four 150 and four 35-watt amplifiers -

8

total.

- Five 150 and two 35-watt amplifiers -

7

total.

- Six 150-Watt amplifiers -

6

total.

This gives the PA1235 great flexibility for use in many applications, such as driving surround sound speaker systems, in addition to multi-room.

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 PA1235 channel pairs (

CI

) On and Off with zone ON and OFF commands.

Remote Master ON/OFF.

Allows the entire PA1235 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 PA1235's ON and OFF automatically with first zone ON and last zone OFF commands.

Default settings.

As received from the factory, Volume level is set to 1 Volt for 35 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 PA1235 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.

PA1235 PANEL AND FEATURE DESCRIPTIONS

1. Front Panel.

19" x 5-1/4" 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 PA1235 [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.

1

2 2

2

POWER

3

1 2 3 4 5 6

4

PA1235

12 CHANNEL POWER AMPLIFIER

®

Fig. 2

PA1235 Front Panel – Features and Functions

PA1235

In addition, this switch must be left in the MANUAL OFF (OUT) position to permit an external DC

Control Voltage to power the PA1235 ON and OFF.

Refer to "

REMOTE MASTER ON/OFF CONTROL

" terminals, item #13.

NOTE:

The PA1235 may also be powered ON/OFF with an external AC line switch into which the power cord of the PA1235 is plugged (such as the switched AC outlet of a preamp, timer, etc.).

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.

On power down, they flash Amber once, then go off.

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, LEDs blink with Volume action.

d) A Mute command will cause them to blink Green (Red if Volume is within 5 dB of Max-V). Mute is released when any other PA1235 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 is approaching maximum ---

not

an indication of power output level.

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.

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).

®

PA1235

3

5 6 7 5 6 7 5 6 7 5 6 7

8 9

5 6 7 5 6 7

10

COMMON BUS COMMON BUS COMMON BUS COMMON BUS COMMON BUS COMMON BUS

LEFT

MODE

LOCAL

1

RIGHT

STEREO

MONO

BRIDGED

WARNING

TURN POWER

OFF BEFORE

CHANGING

MODES

LEFT

MODE

LOCAL

2

RIGHT

STEREO

MONO

BRIDGED

CAUTION

RISK OF ELECTRIC

SHOCK. DO NOT OPEN

LEFT

MODE

LOCAL

3

STEREO

MONO

BRIDGED

RIGHT

REMOTE MASTER

ON/OFF CONTROL

WARNING

TURN POWER

OFF BEFORE

CHANGING

MODES

LEFT

MODE

LOCAL

4

RIGHT

STEREO

MONO

BRIDGED

COMMON AUDIO

BUS

LEFT RIGHT

LEVEL

RESET

LEFT

MODE

LOCAL

5

RIGHT

STEREO

MONO

BRIDGED

WARNING

TURN POWER

OFF BEFORE

CHANGING

MODES

LEFT

MODE

LOCAL

6

RIGHT

STEREO

MONO

BRIDGED

SYLMAR, CA

®

AC 120V 60 HZ

4 AMP

FUSE

10 AMP

SLOW BLOW

+

BRIDGED

--

LEFT

+

SPEAKER

-- --

RIGHT

+

+

BRIDGED

--

LEFT

+

SPEAKER

-- --

RIGHT

+

-+

5-30 VOLTS DC

+

BRIDGED

--

LEFT

+

SPEAKER

-- --

RIGHT

+

+

BRIDGED

--

LEFT

+

SPEAKER

RIGHT

-- -+

+

BRIDGED

--

LEFT

+

SPEAKER

RIGHT

-- -+

+

BRIDGED

--

LEFT

+

SPEAKER

RIGHT

-- -+

AC LINE

ON/OFF

--

0

11 12 11 12

13 14

11

12

Fig. 3

PA1235 Rear Panel – Features and Functions

11 12

15 16

11 12 11 12

17

18

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 35 Watts output.

- Balance centered.

- Mute OFF.

- MAX-V Cleared.

- IR Code Group set to

A0

.

- CI (control in) disabled. Chantes 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 PA1235 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:

10 AMP 220 VAC, SLOW BLOW.

240 V Version:

5 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.

®

4

PA1235

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 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 PA1235 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 PA1235 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 PA1235, 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 PA1235. 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 PA1235, 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 PA1235.

• You will need it to program universal learning devices such as the Xantech URC-2 learning remote, the

Xantech Smart Pads, the 590 Programmable Controller, the 710 Fone Link, etc., with commands that operate the PA1235.

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 PA1235 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:

®

PA1235

5

• 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 PA1235, all commands should be consolidated into one learning device, for ease of use.

APPLICABLE RC68+ BUTTON DESCRIPTIONS

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 PA1235. 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 are as follows:

RC68+ Button PA1235 Level Attenuation in dB

38 (Mute ON) > 90 (Min. Volume)

10 (C & 01 on RC68)

00 (1)

C0 (2)

50 (3)

60

52

44

36

2

3

1

A

80

1

00

5

40

20

TREBLE

60

08

B

48

C

10

2 3

C0 50

6

INPUT

7

A0 30

E0

BASS

88

A8

ADJ-OFF

90

4

D0

8

B0

GLOBAL

70 F0

VOL

Z-ADJ

18 98

38

ON

MUTE

B8

OFF

28

E-FLAT

68

OFF

E1

E8

LAST

C8

89

78

MAX-V

58

C-BAL

C9

F8

TRIM

D8

A9

D0 (4)

40 (5)

A0 (6)

30 (7)

B0 (8)

30

24

18

14

10

71

F1

19

99

59

D9

39

B9

20 (Treble Up Arrow)

E0 (Bass Up Arrow)

6

0 (Max. Volume)

3. OFF

Command. Turns the amplifier pairs (both LOCAL and COMMON) to Standby OFF mode. The "Standby

OFF" mode remains until the MUTE OFF command is sent.

RC68+ PROGRAMMER

01

41

21

61

09

29

69

49

E9

79

F9

A

10

9

8

7

6

5

4

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

.

Fig. 4

The RC68+ Programmer

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).

®

6

PA1235

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 PA1235 has been designed specifically to ramp more quickly in the

DOWN direction and more slowly in the UP direction.

9. Code Group Numbers.

The PA1235 is capable of being set to 55 different code groups, both individually as amplifier pairs and collectively as a group.

NOTE:

As shipped from the factory, all amplifier pairs in the PA1235 are set to code group number

A0.

Be sure to set the RC68+ to the same number!

It may be necessary to change the PA1235 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 PA1235's in large systems, to avoid mutual interaction.

Refer to the RC68+ instructions for code group setting procedures

.

10. ADJ-OFF

Command. This command unlocks a previous MAX-V setting. See also item #6.

INSTALLATION

PHYSICAL LOCATION AND MOUNTING

When you mount the PA1235, 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.

Upper shelf, component, wall, etc.

PA1235

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

2-inch spacing

(minimum)

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

Fig. 5

Horizontal Mounting

PA1235

Convection

Airflow

®

Keep perforations on bottom plate free of obstructions.

7

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.

3.

If the cabinet contains other heat generating components or you are using several PA1235'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 PA1235'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 PA1235 will improve convection in heavy use applications.

[One Rack Unit size = 1-3/4" (44.5mm) in height].

6.

The PA1235 will operate when mounted either horizontally or vertically. Horizontal placement is preferred, however, since it will run approximately 5% to 10% cooler when so oriented.

VIDEO

Preamp Outputs

ZPR68, etc.

L

RCA Type

Patch Cords

7.

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.

AUDIO

R

1

8.

The PA1235 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.

Set

MODE

Switch to

STEREO

position

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.

COMMON BUS

PA1235

Rear Panel

CONNECTING THE PA1235

When making connections to the PA1235 be sure the power cord is unplugged. Proceed as follows:

LEFT

MODE

LOCAL

1

RIGHT

STEREO

MONO

BRIDGED

WARNING

TURN POWER

OFF BEFORE

CHANGING

MODES

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 PA1235. 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 PA1235 as shown.

4. The PA1235 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 PA1235 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.

+ –

+

BRIDGED

--

SPEAKER

LEFT

+

RIGHT

-- -+

Be sure speakers are connected with correct polarity as shown.

Wall speakers, shelf speakers, etc.

+ –

Left Right

Fig. 6

STEREO Mode Connections

®

8

PA1235

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. 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.

VIDEO

L

Preamp Outputs

ZPR68, etc.

RCA Type

Patch Cords

AUDIO

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.

PA1235

Rear Panel

R

COMMON BUS

1

Set

MODE

Switches to

BRIDGED

position

COMMON BUS

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. 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 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 PA1235 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.

®

PA1235

LEFT

MODE

LOCAL

1

RIGHT

STEREO

MONO

BRIDGED

+

BRIDGED

--

SPEAKER

LEFT

+

RIGHT

-- -+

+ –

Left

WARNING

TURN POWER

OFF BEFORE

CHANGING

MODES

Be sure speakers are connected with correct polarity as shown.

Speaker Systems

LEFT

MODE

LOCAL

2

RIGHT

STEREO

MONO

BRIDGED

+

BRIDGED

--

SPEAKER

LEFT

+

RIGHT

-- -+

+

Right

Fig. 7

BRIDGED Mode Connections

9

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 PA1235 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 #6 connector on the CB18 (connection to any of the other connectors would also work) & run to the Common IR IN on the PA1235 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 PA1235 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 PA1235 are set to Code Group number A0. You may, for example, leave the #1 amplifier pair at A0 and change the other five to B0, C0, 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).

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 roomto-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

PA1235 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, use a Dedicated IR System as shown in

Fig. 10

.

®

10

PA1235

CD Changer

CONTROLLED SOURCE COMPONENTS

AM/FM Tuner

Satellite Receiver

L R V L R

Cassette DecK

L R L R

286M

Dual Blink-IR™

Mouse Emitters (2)

RCA type Patch Cords

IR Signal

RS41AV

Audio/Video

Remote Switcher

RS41AV

Power

Supply

1 2

INPUT

3

To Video Distribution (if used)

4

VIDEO

AUDIO

LEFT

AUDIO

RIGHT

OUTPUT

RS41AV

REMOTE SWITCHER

®

SYLMAR, CA • MADE IN U.S.A.

IR

CONFIRM

POWER 15VAC V V

G IR IN

6015900

3.5mm to-stripped-ends mono cable (7)

782

Type

Power

Supply

To AC MAINS

(Unswitched)

White striped side

To AC MAINS

(Unswitched)

PA1235

(rear panel)

COMMON BUS COMMON BUS COMMON BUS COMMON BUS COMMON BUS COMMON BUS

LEFT

MODE

LOCAL

1

RIGHT

STEREO

MONO

BRIDGED

WARNING

TURN POWER

OFF BEFORE

CHANGING

MODES

LEFT

MODE

LOCAL

2

RIGHT

STEREO

MONO

BRIDGED

CAUTION

RISK OF ELECTRIC

SHOCK. DO NOT OPEN

LEFT

MODE

LOCAL

3

RIGHT

STEREO

MONO

BRIDGED

WARNING

TURN POWER

OFF BEFORE

CHANGING

MODES

REMOTE MASTER

ON/OFF CONTROL

LEFT

MODE

LOCAL

4

RIGHT

STEREO

MONO

BRIDGED

COMMON AUDIO

BUS

LEFT RIGHT

LEVEL

RESET

LEFT

MODE

LOCAL

5

RIGHT

STEREO

MONO

BRIDGED

WARNING

TURN POWER

OFF BEFORE

CHANGING

MODES

LEFT

MODE

LOCAL

6

RIGHT

STEREO

MONO

BRIDGED

EMITTERS

789-44

CONNECTING BLOCK

®

12VDC

IR

RCVR

SYLMAR, CA

®

AC 120V 60 HZ

4 AMP

FUSE

10 AMP

SLOW BLOW

+

BRIDGED

--

LEFT

+

SPEAKER

RIGHT

-- -+

+

BRIDGED

--

LEFT

+

SPEAKER

RIGHT

-- -+

-+

5-30 VOLTS DC

+

BRIDGED

--

LEFT

+

SPEAKER

RIGHT

-- -+

TO ROOM 1

SPEAKERS

+12V IR

TO ROOM 2

SPEAKERS

GND

1 2 3

TO ROOM 3

SPEAKERS

4 5

+

BRIDGED

--

LEFT

+

SPEAKER

RIGHT

-- -+

TO ROOM 4

SPEAKERS

6 7

+

BRIDGED

--

LEFT

+

SPEAKER

RIGHT

-- -+

TO ROOM 5

SPEAKERS

CB18

Parallel Connecting Block

+

BRIDGED

--

LEFT

+

SPEAKER

RIGHT

-- -+

AC LINE

ON/OFF

--

0

TO ROOM 6

SPEAKERS

8 9

+12 VDC

IR

GND

To AC MAINS

(Unswitched)

L R L R

L R

V G ST IR

Smart

Pad

3

ROOM 1

L R

V G ST IR

Smart

Pad

ROOM 3

L R

V G ST IR

Smart

Pad

3

ROOM 5

L

V G ST IR

780-80

"J" Box

IR Receiver

ROOM 2

V G ST IR

780-80

"J" Box

IR Receiver

ROOM 4

Fig. 8

Basic PA1235/RS41 System - Requires Room Dedicated Remotes

®

PA1235

V G ST IR

780-80

"J" Box

IR Receiver

ROOM 6

R

11

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 in a system similar to that shown in

Fig. 11

.

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. 10

, where each remote room has a Dedicated IR path going to the PA1235 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-toroom

- 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 PA1235 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 PA1235 amplifier pair, each amplifier pair can use the same IR Code Group (the factory default

A0

).

4. While use of the 796-20 entails some added expense, it reduces programming time for both the handheld 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™.

Connecting the REMOTE MASTER ON/OFF CONTROL Terminals

As mentioned under "PA1235 PANEL AND FEATURE DESCRIPTIONS", the REMOTE MASTER ON/OFF

CONTROL terminals allow the power to the entire PA1235 to be turned ON and OFF by a remotely applied

DC Voltage.

Figs. 9

and

11

are typical applications using this feature.

Using a DC Power Adapter as a Control Voltage

Fig. 10

illustrates how a PA1235 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 PA1235, switching it ON.

• Similarly, when the preamplifier is switched OFF, the DC voltage to the PA1235 is removed, turning it

OFF.

®

12

PA1235

CAUTION:

The output voltage of some adapters, such as the 781RG, drops off too slowly to provide a quick turnoff for the PA1235. 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!

Preamplifier, Control Center, etc.

This

must

be the positive

(+)

lead (

white striped

lead on

Xantech Power Supply Adapters).

COMMON BUS COMMON BUS

LEFT

MODE

LOCAL

2

RIGHT

STEREO

MONO

BRIDGED

CAUTION

RISK OF ELECTRIC

SHOCK. DO NOT OPEN

LEFT

MODE

LOCAL

3

RIGHT

STEREO

MONO

BRIDGED

REMOTE MASTER

ON/OFF CONTROL

(+)

5V to 12 VDC Adapter, such as a Xantech 781RG, plugged into a Switched

AC Outlet on Preamplifier

+

BRIDGED

--

LEFT

+

SPEAKER

RIGHT

-- -+

-+

5-30 VOLTS DC

+

BRIDGED

--

LEFT

+

SPEAKER

RIGHT

-- -+

CAUTION:

You

must

use the included

220

Ω resistor. See

CAUTION note above.

PA1235

(portion of rear panel)

Fig. 9

Using the REMOTE MASTER ON/OFF

CONTROL Terminals

A Multi-Zone Power Managed System, using a ZPR68, a GATEKEEP-IR

and a PA1235

Fig. 11

shows a PA1235 in a typical multi-room system with a Xantech ZPR68-10 six-zone preamp and a

GATEKEEP-IR. The PA1235 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 PA1235.

• 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 PA1235.

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 PA1235.

• Similarly, when the last zone is turned OFF, the CO drops to 0 V, turning the PA1235 totally OFF.

NOTE:

No IR control of the PA1235 is used in the system shown in

Fig. 11

. All volume, mute, etc. functions are handled by IR control of the ZPR68-10. The PA1235 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 PA1235 is controlled via the STATUS and CO functions as noted above.

b) 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).

®

PA1235

13

CD Changer

CONTROLLED SOURCE COMPONENTS

AM/FM

Tuner

Satellite Receiver

L R V L R

Cassette DecK

L R L R

286M

Dual Blink-IR™

Mouse Emitters (2)

RCA type Patch Cords

IR Signal

RS41AV

Audio/Video

Remote Switcher

RS41AV

Power

Supply

1 2 3

INPUT

To Video Distribution (if used)

4

VIDEO

AUDIO

LEFT

AUDIO

RIGHT

OUTPUT

RS41AV

REMOTE SWITCHER

®

SYLMAR, CA • MADE IN U.S.A.

IR

CONFIRM

POWER 15VAC V V

G IR IN

782

Type

Power

Supply

6015900

3.5mm to-stripped-ends mono cable (7)

To AC MAINS

(Unswitched)

PA1235

(rear panel)

White striped side

To AC MAINS

(Unswitched)

COMMON BUS COMMON BUS COMMON BUS COMMON BUS COMMON BUS COMMON BUS

LEFT

MODE

LOCAL

1

RIGHT

STEREO

MONO

BRIDGED

WARNING

TURN POWER

OFF BEFORE

CHANGING

MODES

LEFT

MODE

LOCAL

2

RIGHT

STEREO

MONO

BRIDGED

CAUTION

RISK OF ELECTRIC

SHOCK. DO NOT OPEN

LEFT

MODE

LOCAL

3

STEREO

MONO

BRIDGED

RIGHT

REMOTE MASTER

ON/OFF CONTROL

WARNING

TURN POWER

OFF BEFORE

CHANGING

MODES

LEFT

MODE

LOCAL

4

RIGHT

STEREO

MONO

BRIDGED

COMMON AUDIO

BUS

LEFT RIGHT

LEVEL

RESET

LEFT

MODE

LOCAL

5

RIGHT

STEREO

MONO

BRIDGED

WARNING

TURN POWER

OFF BEFORE

CHANGING

MODES

LEFT

MODE

LOCAL

6

STEREO

MONO

BRIDGED

RIGHT

EMITTERS

789-44

CONNECTING BLOCK

®

12VDC

IR

RCVR

SYLMAR, CA

®

AC 120V 60 HZ

4 AMP

FUSE

10 AMP

SLOW BLOW

+

BRIDGED

--

SPEAKER

LEFT

+ -- --

RIGHT

+

+

BRIDGED

--

SPEAKER

LEFT

+

RIGHT

-- -+

-+

5-30 VOLTS DC

+

BRIDGED

--

SPEAKER

LEFT

+

RIGHT

-- -+

TO ROOM 1

SPEAKERS

TO ROOM 2

SPEAKERS

TO ROOM 3

SPEAKERS

796-20

SIX ZONE CONNECTING BLOCK / EXPANDER

ZONE EMITTERS

ZONE IR INPUTS

ZONE 6 ZONE 5 ZONE 4

+12 IN G +12 IN G +12 IN G

ZONE 4

A B

ZONE 5

A B

ZONE 6

A B

+

BRIDGED

--

SPEAKER

LEFT

+

RIGHT

-- -+

+

BRIDGED

--

SPEAKER

LEFT

+

RIGHT

-- -+

+

BRIDGED

--

SPEAKER

LEFT

+ -- --

RIGHT

+

AC LINE

ON/OFF

--

0

TO ROOM 4

SPEAKERS

ZONE EMITTERS

ZONE 7

A B

ZONE 8

A B

ZONE 9

A B

TO ROOM 5

SPEAKERS

TO ROOM 6

SPEAKERS

SYLMAR CA, MADE IN U.S.A.

ZONE 9

ZONE IR INPUTS

ZONE 8 ZONE 7 COMMON

+12 IN G +12 IN G +12 IN G +12 OUT G

GND

IR

+12 VDC

To AC MAINS

(Unswitched)

L R

L R

L R

V G ST IR

Smart

Pad

ROOM 1

L R

V G ST IR

Smart

Pad

3

ROOM 3

L R

V G ST IR

Smart

Pad

3

ROOM 5

L

V G ST IR

780-80

"J" Box

IR Receiver

ROOM 2

V G ST IR

780-80

"J" Box

IR Receiver

ROOM 4

Fig. 10

Basic PA1235/RS41/796-20 System - Uses Non-Dedicated Room Remotes

14

®

V G ST IR

780-80

"J" Box

IR Receiver

ROOM 6

R

PA1235

TROUBLE SHOOTING

If you encounter a problem, please review the items below. Be sure, in addition, to check other system components, such as preamplifiers, CD players, speakers, speaker wiring, etc., that may be at fault.

1. Front Panel LEDs do not light – no sound.

• Check line cord for good contact in a live AC outlet.

• If the REMOTE MASTER ON/OFF CONTROL terminals (item #12,

Fig. 3

) are used, be sure applied voltage is between +5 V and +30 VDC with proper polarity. Refer to

Fig. 9

.

2. 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

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.

4. PA1235 does not turn OFF when REMOTE input voltage goes to 0 Volts.

• Be sure that the POWER switch (item 3,

Fig. 2

) is set to the MANUAL OFF (Out) position.

5. PA1235 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 replug.

6. 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.

7. The PA1235 blew its fuse (item #10, Fig. 3) as power was turned OFF using an adapter driving the REMOTE MASTER ON/OFF CONTROL terminals.

• The supplied 220 Ohm resistor may not have been connected in shunt with the REMOTE MASTER

ON/OFF CONTROL terminals. Be sure the resistor is connected and that the leads are making secure contact within the screw terminals of the connector. Refer to CAUTION notes,

Fig. 9

.

PA1235

®

15

SPECIFICATIONS

Number of Channels .....................................................................................................................................................12

Power Output

Rated Continuous Power, Each Channel:

............................................. 8 Ohms ..........................

35 Watts

All 12 channels simultaneously driven,

20 Hz to 20 kHz, at rated THD.

Short Term Continuous, Each Channel: ................. 8 Ohms ............................................................ > 55 Watts

(2 channels driven, 1 kHz, at rated THD) 4 Ohms ............................................................ > 80 Watts

Bridged Power Output: .......................................... 8 Ohms .......................................................... > 150 Watts

(Short Term Continuous, one pair driven @ 1 kHz, at rated THD)

Rated THD

........................................................................................................................................................

< 0.08 %

Damping Factor (@ 50 Hz, 1/2 rated power) ....................................................................................................... > 100

S/N Ratio (A Weighted, Shorted Inputs, ref. to Rated Power) ....................................................................... > 100 dB

Frequency Response (@ 1 Watt,

± 3 dB) ............................................................................................ 12 Hz to 55 kHz

Input Sensitivity (@ Rated Power, stereo mode) ............... Input Gain (IR Controlled Setting)

Max. ......................................................................... 0.5 V

Default ...................................................................... 1.0 V

Min. ............................................................................. Off

Input Impedance ................................................................. LOCAL Inputs .................................................... 22 kOhms

COMMON AUDIO BUS Inputs .......................... 70 kOhms

Power Source ................................................................................. 120 VAC, 60 Hz (240 V Version: 240 VAC, 50 Hz)

Power Consumption ........................................................... No Signal ..................................... 30 Watts (0.25/0.13 A)

12 chan @ 1/10 rated power ......... 360 Watts (3.0/1.5 A)

12 chan @ rated power ................ 1090 Watts (9.1/4.6 A)

6 chan Bridged @ 8.5 watts/chan .. 720 Watts (6.0/3.0 A)

Remote ON/OFF and CI Voltage/Current .......................................................... +5 V to +30 VDC (16 mA @ +12 VDC)

Default IR Code Group (all amplifier pairs) ................................................................................................................

A0

Line Fuse Rating .........................

120 V Version:

10 A Slow Blow 220 VAC.

240 V Version:

5 A Time-Lag 250 VAC)

Dimensions ............................................................................ 19" (483mm) W x 5-1/4" (133mm) H x 15.5" (394mm) D

Weight ................................................................................................................................................ 35.75 lbs (16.3kg)

16

®

PA1235

3-9-01

Rev.C

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