Xantech Stereo Amplifier PA640 User Manual

INSTALLATION INSTRUCTIONS  
PA640  
SIX CHANNEL POWER AMPLIFIER  
1
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PA640 PANEL DESCRIPTIONS  
2
1
REMOTE  
ON/OFF  
POWER  
®
BRIDGED  
C H 2  
BRIDGED  
C H 4  
BRIDGED  
C H 6  
LEVEL  
LEVEL  
LEVEL  
1V  
1V  
1V  
C H 1  
C H 3  
C H 5  
PA640  
SIX CHANNEL POWER AMPLIFIER  
STEREO  
STEREO  
STEREO  
3V  
.2V  
3V  
.2V  
3V  
.2V  
SYLMAR, CA  
MADE IN U.S.A.  
LINE INPUTS  
LINE INPUTS  
LINE INPUTS  
Fig. 2 PA640 Input Panel –  
3
4
5
3
4
5
3
4
5
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.  
3
PA640  
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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  
5A  
+
+
+
+
+
+
PROTECTION  
PROTECTION  
PROTECTION  
SPEAKER IMPEDANCE  
STEREO MODE: 8 Ohms Min.  
BRIDGED MODE: 16 Ohms Min.  
+
BRIDGED  
+
BRIDGED  
+
BRIDGED  
S P E A K E R S  
S P E A K E R S  
S P E A K E R S  
10  
8
9
6
7
6
7
6
7
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.  
4
PA640  
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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)  
5
PA640  
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INSTALLER'S NOTES  
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6
PA640  
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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  
L
3. Using good quality speaker wire, connect the individual  
speaker leads to the 4-terminal "SPEAKERS" connectors  
on the PA640 as shown.  
AUDIO  
R
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  
1
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  
1V  
STEREO  
3V  
.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.  
7
PA640  
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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  
L
AUDIO  
Set  
R
BRIDGED/STEREO  
Switches to  
BRIDGED position  
1
TomakeconnectionsfortheBRIDGED  
mode, follow the steps given before for  
stereo connections, but with the follow-  
ing exceptions:  
BRIDGED  
BRIDGED  
LEVEL  
1V  
LEVEL  
1V  
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  
STEREO  
3V  
.2V  
3V  
.2V  
LINE INPUTS  
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  
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  
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.  
8
PA640  
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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.  
9
PA640  
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Fig. 9 A Multi-Zone System Using Two PA640's  
RF IN  
RF IN  
XANTECH  
TV  
TV  
S-62/64/66  
Wall Speakers  
MONITOR  
MONITOR  
R
R
R
L
L
L
780-80  
"J" Box  
IR Receiver  
Smart  
Pad2™  
Smart  
Pad2™  
ZONE 2  
ZONE 4  
ZONE 5  
VIDEO IN  
VIDEO IN  
XANTECH  
S-62/64/66  
TV  
TV  
Wall Speakers  
MONITOR  
MONITOR  
R
R
R
L
L
L
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  
1
2
3
4
5
6
7
8
Mono Mini Plug  
cable.  
Use part  
HI  
LO  
1
2
3
4
5
6
7
8
RG-6  
Coax  
#6017400.  
IR CONFIRM  
COMMON IR OUTPUTS  
ZONE IR OUTPUTS  
1
2
3
4
5
6
7
8
1
2
3
4
5
6
SOURCE INPUTS  
ZONE OUTPUTS  
ANT. or  
Cable  
VIDEO  
VIDEO  
COM  
PORT  
2-Way  
L
AUDIO  
R
L
AUDIO  
POWER  
R
RF  
Amp  
Combiner  
ZPR68-10 Power  
Supply  
CO  
G
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  
V
V
L
L
R
R
AM/FM Tuner  
L
R
To Sat #2  
Video OUT  
To  
IR OUT,  
Gate #8  
Gate  
To  
IR OUT,  
Gate #1  
VCR #1 Pwr  
#1  
SAT #1 Emitter  
SAT #2 Emitter  
VCR #1 Emitter  
VCR #2 Emitter  
LD Emitter  
VCR #2 Pwr  
Gate  
#2  
CD Changer  
L
R
Current  
SENSOR  
SAT Rec'r #2  
Current  
SENSOR  
Gate  
#3  
To  
LD Pwr  
IR OUT,  
To  
Gate #7  
DVD Pwr  
IR OUT,  
Gate #2  
Gate  
#4  
Current  
SENSOR  
DVD Player  
V
L
R
VCR #1  
V
V
L
L
R
R
Current  
SENSOR  
Gate  
#5  
CD Pwr  
To  
To  
Tuner Pwr  
IR OUT,  
Gate  
#6  
IR OUT,  
Gate #3  
Gate #6  
DVD Emitter  
Current  
SENSOR  
LD Player  
V
L
R
To  
To  
Current  
SENSOR  
Gate  
#7  
VCR #2  
120V AC  
120V AC  
ZONE 1 ZONE 2 ZONE 3  
ZONE 4 ZONE 5 ZONE 6  
CD Emitter  
(Unswitched)  
(Unswitched)  
To Speakers in Rooms  
To Speakers in Rooms  
Plug ALL Current  
SENSORs into 120 V  
AC (unswitched).  
To  
IR OUT, Gate #5  
Gate  
#8  
283M  
To  
Blink-IR™  
Mouse  
IR OUT, Gate #4  
AM/FM Tuner Emitter  
Emitter (8)  
GATEKEEP-IR  
SOURCE COMPONENTS  
ZONE AMPLIFIERS - MODEL PA640 (2)  
10  
PA640  
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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  
Protection  
Feedback  
INVERTER  
CH1  
+
+
Input  
POWER ON/OFF LED  
MANUAL OFF  
(Remote ON/OFF)  
REMOTE  
Power Mute  
Fuse  
ON/OFF  
5A 220V AC  
MANUAL  
ON  
+
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  
© 1996 Xantech Corporation. All rights reserved. Design and specifications subject to change without notice.  
3-24-99  
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