Xantech Stereo Amplifier PA640 User Manual

INSTALLATION INSTRUCTIONS

PA640

SIX CHANNEL POWER AMPLIFIER



PA640 PANEL DESCRIPTIONS

REMOTE

ON/OFF

POWER

BRIDGED

C H 2

BRIDGED

C H 4

BRIDGED

C H 6

LEVEL

C H 1

C H 3

C H 5

PA640

SIX CHANNEL POWER AMPLIFIER

STEREO

.2V

SYLMAR, CA

MADE IN U.S.A.

LINE INPUTS

Fig. 2 PA640 Input Panel –

Features and Functions

1. POWER Indicator LED. This green LED lights when power is turned on by the POWER switch (item

# 8) or by a DC voltage applied to the REMOTE ON/OFF jack (item #2).

2. REMOTE ON/OFF Jack. This 3.5mm mono mini jack allows the PA640 to be powered on and off by

a positive DC voltage ranging between 4 and 30 volts (11 mA @ 12 V). For instance, it permits the

12VoltCO(ControlOutput)fromaXantechZPR68IRcontrolledpreamptopowerthePA640ONand

OFF automatically with zone ON/OFF commands. The DC Voltage must be applied continuously to

hold the ON condition and go to less than 0.5 Volt for the OFF condition.

NOTE: The POWER switch (item #8) must be left in the MANUAL OFF (REMOTE ON/OFF)

position to permit the REMOTE ON/OFF jack to operate.

3. 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 3.3 volts (24.3 dB).

Normally you would adjust the driving preamp to max. 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.

4. LINE INPUTS. These RCA type jacks are the audio inputs for the amplifier. Connect them to the

OUTPUT jacks of the driving preamp with good quality RCA type patch cables. Note that the inputs

are marked CH1, CH2, CH3, etc., signifying the individual channels. They correspond to the like

marked speaker terminals on the OUTPUT & AC panel (item # 7). When the switches (item #5) are

set to the BRIDGED mode, CH1, CH3 and CH5 become the active inputs and CH2, CH4 and CH6

are disabled.

5. BRIDGED/STEREO Switches. These switches allow each of the three pair of amplifiers to be placed

in either the BRIDGED 140 Watt (single channel) mode, or in the STEREO 40 Watts/channel (two

channel) mode.

CAUTION: Be sure to have the POWER turned OFF when changing the position of this switch and

when making the corresponding speaker connection changes.



PA640

PA640 PANEL DESCRIPTIONS

POWER

M A N U A L O N

M A N U A L O F F

( R E M O T E O N / O F F )

CH6

CH5

CH4

CH3

CH2

CH1

120 VAC

60 HZ

FUSE

–

PROTECTION

SPEAKER IMPEDANCE

STEREO MODE: 8 Ohms Min.

BRIDGED MODE: 16 Ohms Min.

BRIDGED

–

BRIDGED

–

BRIDGED

–

S P E A K E R S

Fig. 3 PA640 Output & AC Panel – Features and Functions

6. PROTECTIONIndicatorLED's. TheseredLED's,oneforeachpairofchannels,lightfor3to4seconds

when the amplifier senses a short circuit or a very low load impedance (under 2-Ohms) at the speaker

terminals. This protects the amplifier from potentially harmful conditions. If the short condition or the

input signal is not removed, the amplifier will continue to cycle on and off at the 3 to 4 second interval.

CAUTION: Do not allow this to continue for a lengthy period of time. Reduce the volume, remove the

short or low impedance condition and try again.

NOTE: The PROTECTION LED's will also light for 5 to 8 seconds when the amplifier is first turned

on. This is a normal muting function that quiets the amplifier during start-up.

7. SPEAKER Terminals. These plug-in 4-terminal screw 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 CH1, CH2, etc., markings, for each wire pair going to the speakers.

CAUTION: When making connections for the BRIDGED mode, remember only one speaker is being

attachedperamplifierpair. Besuretoobservetheouter"+" and"–"polaritymarkingsonthe4-terminal

connector, as shown on the panel, for the one wire pair connecting to the speaker.

8. POWERSwitch. WhenpressedtotheINposition, powerisappliedtothePA640. ThisistheMANUAL

ON position. When pressed again, it releases to the OUT position (MANUAL OFF), turning the unit

OFF.

Inaddition,thisswitchmustbeleftintheMANUALOFF(REMOTEON/OFF)positiontopermitexternal

DC Voltage control of power ON/OFF for the PA640.

NOTE: The PA640 may also be powered ON/OFF with an external AC line switch (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.

9. AC LINE Cord. Depending on the application, plug into a switched or un-switched 120V 60 Hz AC

outlet.

10. FUSE. When required, replace only with a fuse of the same type and rating (5 A 220V AC).

Replacement with a fuse of higher rating will not protect the amplifier and will void the warranty.



PA640

INSTALLATION

PHYSICAL LOCATION AND MOUNTING

When you mount the PA640, you need to 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 over the heat

dissipating fins for ad-

equate cooling.

2. If mounted in an equip-

mentcabinetorothercon-

fining location, allow at

least 3 inches of space

above the heat sink fins

(seeFig.4). Besurethere

are large openings to al-

low the entry of cool air

and the escape of warm

air.

Shelf, wall, etc.

3-inch spacing

(minimum)

Heat Dissipation

Fins

Aluminum mounting

panel (preferred)

PA640

3. If the cabinet contains

other heat generating

components, or you are

using several PA640's in

alargemulti-zonesystem,

Fig. 4 Horizontal Mounting

you will have to pay even closer attention to adequate ventilation.

PA640

FINS

4. Donothesitatetousefans, ifnecessary, toensureaconstantflow

of air over the PA640's and the other heat generating compo-

nents.

5. The PA640 will operate when mounted either horizontally or

vertically. The vertical placement is preferred, however, since it

will run approximately 5% to 10% cooler when so oriented. See

Fig. 5.

6. In multi-zone installations, you will have large bundles of leads to

accommodate audio, video and speaker connections. Be sure to

allow enough room for the leads and dress them so that they do

not block airflow.

7. Mounting the PA640 onto an aluminium panel (rather than on

wood or other non-heat conducting material) will add additional

heat dissipation capability. See Fig. 4 & 5.

8. Use the 4 holes on the chassis skirts and the screws provided to

mount the PA640.

Aluminum mounting

panel (preferred)

Fig. 5 Vertical mounting (preferred)



PA640

INSTALLER'S NOTES

____________________________________________________________________________



PA640

INSTALLATION (cont'd)

CONNECTING THE PA640

I When making connections to the PA640 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 CH1,

CH2, etc. LINE INPUTS jacks on the PA640. Do this for

Preamp Outputs

ZPR68, etc.

each amplifier pair. Refer to Fig. 6.

VIDEO

2. Slide the BRIDGED/STEREO switch to the STEREO

position.

RCA Type

Patch Cords

3. Using good quality speaker wire, connect the individual

speaker leads to the 4-terminal "SPEAKERS" connectors

on the PA640 as shown.

AUDIO

4. Even though the PA640 is 2-Ohm safe in Stereo Mode,

make sure the impedance presented to the speaker

terminals by the speakers (or any combination of speak-

ers) is 4-Ohms minimum.

Set

BRIDGED/STEREO

Switch to

STEREO position

5. Be sure to observe correct polarity by connecting the "+"

and "–" terminal from each channel on the PA640 to the

corresponding "+" and "–" terminals on each speaker.

Thiswillensurecorrect"phasing". SeeFig.6andSpeaker

Phasing below.

BRIDGED

LEVEL

C H 1

C H 2

STEREO

.2V

LINE INPUTS

Since the connectors are removable, you may unplug

them for ease of lead assembly.

PA640 Input Panel

6. Asaruleofthumb, use18gaugespeakerwireforspeaker

runsupto30',16gaugeupto70', and14gaugeupto150'.

The 4-terminal connectors accept wire sizes up to 12

gauge max.

PA640 Speakers & AC Panel

CH2

CH1

–

PROTECTION

7. Strip the insulation back about 1/4" and twist the strands

on each lead to prevent fraying.

BRIDGED

–

CAUTION: After lead ends are inserted and the screws

tightened down, be sure there are no free strands that

could cause shorting!

S P E A K E R S

Be sure speakers are

connected with correct

polarity as shown.

Speaker Phasing

Toobtainstableimagingandfullbassresponse, itisimperative

that stereo speakers be connected "in phase" with each other.

You can verify this as follows:

–

1. 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.

Wall speakers,

shelf speakers, etc.

Left

Right

Most manufacturer's identify the positive terminal with a

red binding post, a "+" sign, or a red dot.

2. 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

Fig. 6 STEREO Mode Connections

the speakers along with best bass response.



PA640

INSTALLATION (cont'd)

Bridged Mode Connections

Ingeneral, itisrecommendedthattheBRIDGED

mode not be used in multi-room applications

whereseveralspeakersaredriventhroughroom

volume controls and the like. For such applica-

tions, use the STEREO mode. Instead, use the

BRIDGED mode for single speaker, higher power

applications, such as in surround sound systems.

Use speakers with an impedance rating of 8-Ohms

minimum.

Preamp Outputs

ZPR68, etc.

VIDEO

RCA Type

Patch Cords

AUDIO

Set

BRIDGED/STEREO

Switches to

BRIDGED position

TomakeconnectionsfortheBRIDGED

mode, follow the steps given before for

stereo connections, but with the follow-

ing exceptions:

BRIDGED

LEVEL

C H 1

C H 2

C H 3

C H 4

1. Connect RCA type patch cables

from the OUTPUT jacks of the

driving preamp or other source to

the PA640 LINE INPUT jacks

marked CH1, and/or CH3, and/or

CH5. Do this for just the amplifier

pairsyouwishtoruninthebridged

mode.

STEREO

.2V

LINE INPUTS

PA640 Input Panel

PA640 Speakers & AC Panel

CH4

CH3

CH2

CH1

(Jacks marked CH2, CH4 & CH6

are disabled in BRIDGED mode).

Refer to Fig. 7.

–

PROTECTION

CAUTION: Be sure power is OFF

when connecting or switching the

amp for BRIDGED operation.

BRIDGED

–

BRIDGED

–

S P E A K E R S

2. Slide the BRIDGED/STEREO

switch to the BRIDGED position.

NOTE: Do this only on the amplifier pairs you

wish to run in the bridged mode!

Be sure speakers are

connected with correct

polarity as shown.

–

3. Connectonespeakerwirepairbetweenthe4-

terminal "SPEAKERS" connectors on the

PA640 and the speakers as shown in Fig. 7.

Be sure to use only the two outer terminals

marked "+" and "–" on the 4-terminal connec-

tor as shown on the panel for BRIDGED

connections.

Speaker Systems

Right

Left

NOTE: Only one speaker is connected per amplifier

pair in the BRIDGED mode!

Fig. 7 BRIDGED Mode Connections

CAUTION: When operating in the BRIDGED mode

(particularlywhenbenchtestingtheamplifier)donot

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

inappropriateconnectionsarenotcoveredunderthe

warranty.



PA640

INSTALLATION (cont'd)

Connecting the REMOTE ON/OFF Jack

As mentioned under "PA640 PANEL DESCRIPTIONS", the REMOTE ON/OFF jack allows the power to

thePA640tobeturnedONandOFFbyaremotelyappliedDCVoltage. Figs.8and9aretypicalapplications

using this feature.

Fig. 8 illustrates how a PA640 can be switched ON and OFF via the switched AC outlet on the rear of a

preamplifier. WhenthepreamplifierPowerSwitchisswitchedON,powerisappliedtotheDCadapterwhich

in turn applies 4V to 30V DC to the PA640, switching it ON. Similarly, when the preamplifier is switched

OFF, the DC voltage to the PA640 is removed, turning it OFF.

4V to 30V DC Adapter

plugged into a Switched

AC Outlet on Preamplifier

3.5mm Plug.

Tip must be

positive (+).

Preamplifier

REMOTE

ON/OFF

POWER

PA640

SIX CHANNEL POWER AMPLIFIER

SYLMAR, CA

MADE IN U.S.A.

PA640

Fig. 8 REMOTE ON/OFF Jack Connections

Fig. 9 shows two PA640's in a typical multi-room system with a Xantech ZPR68 6-zone preamp. In this

case, the common +12V CO (control output) from the ZPR68 is used to remotely turn the PA640 ON/OFF.

When any one of the zones is turned on, the common +12V CO goes high, turning each of the PA640's ON.

Similarly, when the last zone is turned OFF, the +12V CO drops to 0V and turns the PA640's OFF.

TROUBLE SHOOTING

If you encounter a problem, please review the items in the following list. Be sure, in addition, to check other

systemcomponents,suchaspreamplifiers,CDplayers,speakers,speakerwiring,etc.,thatmaybeatfault.

PROBLEM

PROBABLE CAUSE AND SOLUTION

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

• If REMOTE ON/OFF jack is used, be sure applied voltage is

between +4V and +30V DC with proper polarity. See Fig. 8.

• BRIDGED/STEREO switch is incorrectly set to BRIDGED

position. Set to STEREO position. See Fig. 6.

1. Power Indicator does not light – no sound.

2. No sound from CH2, CH4 or CH6 when

stereo operation is desired.

• Speaker load impedance is less than 2-Ohms for Stereo mode or

less than 4-Ohms for Bridged mode. Make changes in speakers

as necessary to obtain higher impedance.

3. Sound cuts in and out every 3 to 5 seconds.

4. PA640 does not turn OFF when REMOTE

input voltage goes to 0 Volts.

• Be sure that the POWER switch (item 8, fig. 3) is set to the

MANUAL OFF (REMOTE ON/OFF) position.

5. PA640becomesverywarm,shutsOFF,but

does not come back ON automatically.

• Set POWER switch (item 8, Fig. 3) to MANUAL OFF (OUT)

position for 15 seconds, then back ON. If REMOTE ON/OFF

jack is used, unplug for 15 seconds, then replug.



PA640

Fig. 9 A Multi-Zone System Using Two PA640's

RF IN

XANTECH

S-62/64/66

Wall Speakers

MONITOR

780-80

"J" Box

IR Receiver

Smart

Pad₂™

Smart

Pad₂™

ZONE 2

ZONE 4

ZONE 5

VIDEO IN

XANTECH

S-62/64/66

Wall Speakers

MONITOR

4-Conductor

Home Runs.

Smart

Pad₂™

CAUTION

480-00

Smart

Pad₂™

See

Dinky Link™

IR Receiver

Smart

Pad₂™

"POWER SUPPLY

CONSIDERATIONS"

in ZPR68-10

ZONE 1

ZONE 3

ZONE 6

Manual, page 10.

RF Signal

IR Signal

RF (TV)

Signal.

Use

RG-6

Coax

ZONE CONTROL - IR INPUTS

ZPR68-10

+12V

GND

SIX ZONE EIGHT SOURCE REMOTE PREAMP

STATUS

IR IN

COMMON IR LEVEL

COMMON IR INDICATOR

Base

Band

Video.

Use

3.5-to-3.5mm

Mono Mini Plug

cable.

Use part

RG-6

Coax

#6017400.

IR CONFIRM

COMMON IR OUTPUTS

ZONE IR OUTPUTS

SOURCE INPUTS

ZONE OUTPUTS

ANT. or

Cable

VIDEO

COM

PORT

2-Way

AUDIO

POWER

Amp

Combiner

ZPR68-10 Power

Supply

To 120 V AC

(unswitched)

Modulator

(2-Input)

POWER

SUPPLY

SYLMAR, CA • MADE IN U.S.A.

2-Conductor

Mini-Plug-

to-Stripped

Ends. Use

6015900.

782-00

Power

Supply

A/V

Patch Cords

Loop video thru to

ZPR68-10 Video Inputs

(if necessary).

Plug SAT Rec'rs into

120 VAC (unswitched)

A/V

Patch Cords

To Sat #1

Video OUT

Remote

ON/OFF

Remote

ON/OFF

SAT Rec'r #1

AM/FM Tuner

To Sat #2

Video OUT

IR OUT,

Gate #8

Gate

IR OUT,

Gate #1

VCR #1 Pwr

SAT #1 Emitter

SAT #2 Emitter

VCR #1 Emitter

VCR #2 Emitter

LD Emitter

VCR #2 Pwr

Gate

CD Changer

Current

SENSOR

SAT Rec'r #2

Current

SENSOR

Gate

LD Pwr

IR OUT,

Gate #7

DVD Pwr

IR OUT,

Gate #2

Gate

Current

SENSOR

DVD Player

VCR #1

Current

SENSOR

Gate

CD Pwr

Tuner Pwr

IR OUT,

Gate

IR OUT,

Gate #3

Gate #6

DVD Emitter

Current

SENSOR

LD Player

Current

SENSOR

Gate

VCR #2

120V AC

ZONE 1 ZONE 2 ZONE 3

ZONE 4 ZONE 5 ZONE 6

CD Emitter

(Unswitched)

To Speakers in Rooms

Plug ALL Current

SENSORs into 120 V

AC (unswitched).

IR OUT, Gate #5

Gate

283M

Blink-IR™

Mouse

IR OUT, Gate #4

AM/FM Tuner Emitter

Emitter (8)

GATEKEEP-IR

SOURCE COMPONENTS

ZONE AMPLIFIERS - MODEL PA640 (2)



PA640

Fig. 10 Block Diagram (Channels 1 and 2 only)

STEREO

DISCRETE DRIVER & OUTPUT STAGES

CH2

Input

BRIDGED

Feedback

PROTECTION

LED

–

CH2

CH1

INPUT

LEVEL

Mute

and

Protection

Feedback

INVERTER

CH1

Input

POWER ON/OFF LED

MANUAL OFF

(Remote ON/OFF)

REMOTE

Power Mute

Fuse

ON/OFF

5A 220V AC

MANUAL

Power

Supply

120V AC

60 Hz

Opto-

Isolator

PWM

SPECIFICATIONS

Number of Channels ..................................................................................................................................................... 6

Power Output ....

Rated Continuous Power, Each Channel: ............................................. 8 Ohms .......................... 40 Watts

All 6 channels simultaneously driven,

20 Hz to 20 kHz, at rated THD.

Short Term Continuous, Each Channel: ....................... 8 Ohms ................................................... > 50 Watts

(2 channels driven, 1 kHz, at rated THD)

4 Ohms ................................................... > 70 Watts

Bridged Power Output: ................................................. 8 Ohms ................................................. > 140 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 (ref. to rated power) ................................................................................................... > 100 dB

Frequency Response (@ 1 Watt, 3 dB) ..............................................................................................8 Hz to 100 kHz

Input Sensitivity ....................................................................... Input Gain Position

Max. ................................................................. 0.2 V

Mid. .................................................................. 1.0 V

Min. .................................................................. 3.3 V

Input Impedance ............................................................................................................................................. 50 kOhms

Power Supply .........................................................................................................................................120 VAC, 60 Hz

Power Consumption .................................................................. No Signal ....................................... 35 Watts (0.29 A)

6 chan @ 1/10 rated power .......... 265 Watts (2.2 A)

6 chan @ rated power ................... 640 Watts (5.3 A)

3 chan Bridged @ 14 watts/chan ... 440 Watts (3.7 A)

Remote ON/OFF Voltage...................................................................................................................... +4V to +30V DC

Line Fuse Rating ..........................................................................................................................................5A 220V AC

Dimensions ......................................................................................................................... 13.5" L x 12.25" W x 3.6" H

Weight ............................................................................................................................................................... 14.3 lbs

3-24-99



PA640

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