Xantech Stereo Amplifier FOUR CHANNEL HI POWER AMPLIFIER User Manual

INSTALLATION INSTRUCTIONS  
MODEL PA4100X  
FOUR CHANNEL HI-POWER AMPLIFIER  
TABLE OF CONTENTS  
SectionTitle  
Page  
SAFETY INSTRUCTIONS - READ BEFORE OPERATING EQUIPMENT.........................................................................................................2  
GENERAL INFORMATION .............................................................................................................................................................................3  
PA4100X PANEL AND FEATURE DESCRIPTIONS ........................................................................................................................................5  
INSTALLATION - PHYSICAL LOCATION AND MOUNTING ............................................................................................................................8  
CONNECTING THE PA4100X.........................................................................................................................................................................9  
Stereo Mode Connections...................................................................................................................................... 9  
Speaker Phasing.................................................................................................................................................. 10  
Connecting the REMOTE MASTER ON/OFF MUTE CONTROL........................................................................... 10  
A Multi-Zone System Diagram Using The PA4100X and MRC88.......................................................................... 12  
TROUBLE SHOOTING .................................................................................................................................................................................13  
SPECIFICATIONS........................................................................................................................................................................................14  
 
Model PA4100X  
Page 3  
GENERAL INFORMATION  
To enhance the ease of installation and obtain optimum performance from the PA4100X, we recommend that you first  
become familiar with all its features and special capabilities by studying the descriptions and instructions in this  
manual.  
The PA4100X was designed to meet the audio power amplifier needs of custom installed multi-zoned systems with  
high sonic quality and hi power output. 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 2-zone amplifier. Specific features and technology are  
as follows:  
Figure 1: The Model PA4100X Amplifier  
Cost/Size Efficiency. The PA4100X features four 100-watt power amplifiers. This permits each PA4100X to drive 2-  
zones in a multi-zone system -- each with a 100-watt stereo amplifier per zone.  
Remote ON/OFF Control Jacks (C1 & C2). These 3.5mm Stereo Mini Jacks allow the PA4100X to be powered on  
and off and muted by a positive DC voltage ranging between 5 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 PA4100X ON and OFF automatically with zone ON/OFF commands or any 12VDC control signal.  
Input Level Flexibility. The input level (sensitivity range) is 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.).  
Low Impedance Capability. Each amplifier is 4-Ohm safe under music conditions. This means, for instance, that  
you can drive two pairs of 8-Ohm speakers in stereo mode in each zone with ease.  
Peak/Clip LED Indication: Whenever either amplifier channel output starts to enter a clipping state, the channels  
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.  
© 2003 Xantech Corporation  
 
Page 4  
Model PA4100X  
Auto Protection Circuit. This feature protects the PA4100X 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 PA4100X  
Page 5  
PA4100X PANEL AND FEATURE DESCRIPTIONS  
1. Front Panel. 17" X 5.25” panel designed for shelf mounting. The unit measures 6” high with the Feet (Item  
#5). When rack mounting use an adequate rack shelf mount making sure to allow for proper ventilation.  
3
4
2
1
5
FIGURE 2 – THE MODEL PA4100X FRONT PANEL – FEATURES AND FUNCTIONS  
2. POWER ON/OFF/STANDBY SWITCH:  
ƒꢀ POWER ON/OFF MODE: When the CI switch on the rear of the unit is set to OFF the front Power Switch  
will act as a standard ON/OFF (IN/OUT) control.  
ƒꢀ STANDBY MODE: With the POWER SWITCH left in the IN position (and the CI switch set to ON) the 2  
channels of PA4100X may be controlled remotely from the MRC88 via the CI1 and CI2 Control Inputs (or  
any Voltage Control Signal). When both channels enter STANDBY Mode the front LEDS will turn off  
leaving the amplifier in a low current sleep mode.  
3. Status LED Indicators. These indicators, one for each channel pair, provide the following status information:  
ƒꢀ GREEN LED: Indicates Amplifier is ON  
ƒꢀ RED LED: Indicates associated channel output is in a CLIPPING state. LED will go back to GREEN 5-6  
seconds after clipping subsides.  
ƒꢀ 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  
© 2003 Xantech Corporation  
 
Page 6  
Model PA4100X  
are currently in STANDBY MODE. Whenever the LOGO is not illuminated, this indicates the amplifier is  
powered OFF.  
5. Feet: Provides required ¾” spacing when unit is shelf mounted to allow for proper ventilation. These feet  
should not be removed. (see the section entitled INSTALLATION for further information)  
14  
8
7
6
6
12  
11  
11  
13  
9
9
10  
FIGURE 3 – PA4100X 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.  
7. Input LEVEL Control. This screwdriver adjustable control (for each stereo 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 range). 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.  
8. FUSE. When required, replace only with a fuse of the same type and rating:  
ƒꢀ 120 V Version: 10.0 AMP 250 VAC, SLOW BLOW.  
ƒꢀ 240 V Version: 5.0 A Time-Lag 250 VAC.  
CAUTION: Replacement with a fuse of higher rating will not protect the amplifier and will void the  
warranty.  
9. SPEAKER Terminals. These plug-in 4-terminal screw type connectors permit speaker wire sizes up to  
12 gauge. When making connections for the STEREO mode, be sure to observe the "+” and "–" polarity  
markings, just under the LEFT & RIGHT markings, for each wire pair going to the speakers.  
© 2003 Xantech Corporation  
 
Model PA4100X  
Page 7  
10. 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.  
11. REMOTE MASTER ON/OFF and MUTE CONTROL (CI1 & CI2). These two Stereo Mini Jack  
connections allow each individual channel pair of the PA4100X to be powered ON and OFF and muted  
by a control voltage ranging between 5 and 30 Volts DC (11mA @ 12 V). When connected to the C01  
and C02 jacks from Zones 7 & 8 on the Xantech MRC88, this will allow remote Power ON/OFF control  
directly from the MRC88 System Controller. This allows the ‘A’ & ’B’ amplifier channel pairs to be  
individually controlled by Zones 7 & 8 of the MRC88. (Tip = ON/OFF Standby Control; Ring = Mute  
Control; Sleeve = gnd).  
12. 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).  
13. Rear Panel POWER LED. This LED indicates the AC power ON/OFF condition of the entire PA4100X,  
regardless of the Standby state. If the Front Power Switch is in the ON (IN) position and the unit is  
connected to an adequate AC Power source, this LED should be illuminated whether the front STATUS  
LED’s are ON or OFF.  
14. REMOTE/LOCAL CI Control Switch: When set to the ON (UP) position, Remote Standby ON/OFF  
control of the amplifier will be determined by the Voltage state applied to the CI1 and CI2 control inputs  
(Item #11) (Front Power Switch – Item #2 must be in the IN position). When set to the OFF (DOWN)  
position, the amplifier will operate according to the Front Power Switch regardless of voltages applied to  
the CI1 and CI2 inputs.  
NOTE: With the CI switch in the ON (UP) position, a control signal MUST be used on the CI1 and CI2  
inputs otherwise the PA4100X will remain in STANDBY MODE.  
© 2003 Xantech Corporation  
 
Page 8  
Model PA4100X  
INSTALLATION - PHYSICAL LOCATION AND MOUNTING  
Upper shelf, component, wall, etc.  
2-inch spacing  
(minimum)  
Keep perforations on top cover free  
of obstructions!  
PA4100X  
Convection  
Airflow  
To maximize air flow, route  
single large opening in lower shelf.  
Keep perforations on bottom  
plate free of obstructions.  
Figure 4 – HORIZONTAL MOUNTING  
When mounting the PA4100X, 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.  
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.  
NOTE: Do not remove feet in shelf-top installations and make sure top and bottom perforations are free  
from obstruction..  
3. If the cabinet contains other heat generating components, 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  
PA4100X's and the other heat generating components.  
5. When mounting in a 19" (483mm) rack, adding a double RU (Rack Unit) above and a single RU below the  
PA4100X will improve convection in heavy use applications.  
[One Rack Unit size = 1-3/4" (44.5mm) in height].  
© 2003 Xantech Corporation  
 
Model PA4100X  
Page 9  
6. 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 strain relief for the leads and dress them in such a manner so as  
not to block airflow.  
7. The PA4100X is designed for shelf mounting on flat horizontal surfaces. When mounting into a 19" rack, use an  
appropriate rack kit.  
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.  
CONNECTING THE PA4100X  
PREAMP OUT  
7
L
R
STATUS  
ZONE IR  
K
E
Y
P
A
D
PA435X  
Rear Panel  
RCA Type  
Patch Cords  
LEFT  
RIGHT  
A
1V  
LEVEL  
3V  
.2V  
CI  
1
SPEAKER  
DO NOT BRIDGE  
LEFT  
+
-- -R- IGHT  
+
Be sure speakers are  
connected with correct  
polarity as shown.  
+
+
Wall speakers,  
shelf speakers, etc.  
Left  
Right  
Figure 5 - PA4100X Stereo Mode Connections  
NOTE: When making connections to the PA4100X be sure the AC power cord is unplugged.  
Stereo Mode Connections  
1. Using good quality RCA-type patch cables connect the L and R OUTPUT jacks of the MRC88 Pre Amp Output or  
other driving preamp to the LEFT and RIGHT input jacks on the PA4100X. Do this for each amplifier pair. Refer  
to Fig. 5.  
2. Using good quality speaker wire, connect the individual speaker leads to the 4-terminal "SPEAKER" connectors  
on the PA4100X as shown.  
© 2003 Xantech Corporation  
 
Page 10  
Model PA4100X  
3. The PA4100X 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 PA4100X to  
the corresponding "+" and "–" terminals on each speaker. This will ensure correct "phasing" - see Fig. 5 and  
Speaker Phasing below. Since the connectors are removable, you may unplug them for ease of lead assembly.  
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. 5, 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.  
Connecting the REMOTE MASTER ON/OFF MUTE CONTROL  
As mentioned under "PA4100X PANEL AND FEATURE DESCRIPTIONS", the REMOTE MASTER ON/OFF  
CONTROL inputs (CI1 & CI2) will allow the power to the PA4100X to be turned ON, OFF, and MUTED by remotely  
applied DC Voltages. Fig. 7 illustrates how a PA4100X can be switched ON and OFF via the MRC88 Zone 7 & 8  
Control Outputs (CO1 and CO2) or other control source.  
NOTE: To enable this feature, be sure the CI Switch (Item #14) is in the ON (UP) position.  
On/Off Standby Control:  
Whenever a 5 to 30v dc voltage is applied to the TIP of the 3.5mm Stereo jack, the associated Amplifier channel will  
be activated (Powered ON). When the signal applied to the TIP approaches GND, it will put the associated Amplifier  
channel in STANDBY Mode. If both Amplifier channels are in STANDBY MODE the Amplifier will enter a “low power”  
STANDBY mode (Illuminated LOGO will remain ON).  
Mute Control:  
Whenever a 5 to 30v dc voltage is applied to the RING of the 3.5mm Stereo jack, the associated Amplifier channels  
signal output will be MUTED. When the signal applied to the RING approaches GND it will UN-MUTE the associated  
Amplifier channel and the audio signal will be returned to its previous level.  
Ring:12v DC = AMP MUTED  
Tip:12vDC = AMP ON  
Insulators  
Sleeve=GND  
3.5mm Mini Plug  
(3-Conductor)  
Figure 6: CI Control Jack Pin Out Config  
© 2003 Xantech Corporation  
 
Model PA4100X  
Page 11  
MRC88 Rear Panel  
Zones 7 & 8  
PREAMP OUT  
8
PREAMP OUT  
7
L
R
L
R
STATUS  
STATUS  
ZONE IR  
ZONE IR  
K
E
Y
P
A
D
K
E
Y
P
A
D
REMOTE AMP  
CO1  
REMOTE AMP  
CO1  
VIDEO  
OUT 7  
VIDEO  
OUT 8  
PA435X  
Rear Panel  
LEFT  
RIGHT  
LEFT  
RIGHT  
A
1V  
1V  
LEVEL  
3V  
LEVEL  
3V  
.2V  
.2V  
CI  
2
CI  
1
SPEAKER  
SPEAKER  
DO NOT BRIDGE  
DO NOT BRIDGE  
LEFT  
+
-- -R- IGHT  
+
LEFT  
+
-- -R- IGHT  
+
Figure 7: Using the PA4100X REMOTE MASTER ON/OFF CONTROL Terminals  
© 2003 Xantech Corporation  
 
Page 12  
Model PA4100X  
A Multi-Zone System Diagram Using The PA4100X and MRC88  
Fig. 8, following, shows the PA4100X in a typical multi-room system with a Xantech MRC88 eight-zone preamp.  
Use 3.5mm  
Stereo Mini Plug  
Cables  
RCA Type  
Patch Cords  
ZONE 7  
ZONE 8  
To Speakers in Rooms  
Figure 8: Interfacing the PA4100X with an MRC88 Zones 7 & 8  
In this case:  
1. Using good quality RCA Stereo Patch Cords, connect the Preamp Outputs of Zone 7 on the MRC88 to  
the Left and Right Audio Inputs labeled ‘A’ on the rear of the PA4100X.  
2. Similar to step 1, connect the Preamp Outputs of Zone 8 on the MRC88 to the Left and Right Audio  
Inputs labeled ‘B’ on the rear of the PA4100X.  
3. Using two 3.5mm Stereo Mini Plug cables, connect the Remote Amp CO1 jack on the rear of the  
MRC88 to the CI1 jack on the rear of the PA4100X  
4. Similar to step 3, connect the Remote Amp CO2 jack on the rear of the MRC88 to the CI2 jack on the  
rear of the PA4100X.  
5. Set the CI Switch (Item #14) to the ON (UP) position.  
The Remote Amp CO1 & CO2 (Remote Control Jack) from the MRC88 allows for individual Zone control  
directly from the Zone 7 & 8 keypads of the MRC88 system. When any one of the zones is turned on, the  
PA4100X is powered ON. Similarly, when either Zone is powered down, the associated amplifier pair on the  
PA4100X is put into STANDBY Mode. When both Zones (7 & 8) are powered down, the PA4100X will either  
go into STANDBY Mode on both amplifier pairs or will be POWERED OFF depending upon the position of the  
front panel POWER/STANDBY button (IN = STANDBY; OUT = ON/OFF).  
© 2003 Xantech Corporation  
 
Model PA4100X  
Page 13  
TROUBLE SHOOTING  
If you encounter a problem, please review the items in the following list. Be sure, in addition, to check other system  
components, such as preamplifiers, CD players, speakers, speaker wiring, etc., that may be at fault.  
PROBLEM  
PROBABLE CAUSE AND SOLUTION  
Rear panel Power Indicator does not light – no sound.  
Check line cord for good contact in a live AC outlet. If  
REMOTE CI jacks are being used, be sure applied  
voltage is between +5V and +30V DC with proper  
polarity. See Fig. 6.  
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 speakers as necessary to obtain  
higher impedance.  
PA4100X does not turn OFF when both REMOTE input Be sure that the CI Switch (item 14, Fig. 3) is set to the  
voltages go to 0 Volts. The Logo stays illuminated.  
CI ON (UP) position.  
PA4100X becomes very warm, shuts OFF, but does  
not come back ON automatically.  
Set POWER switch (item 2, Fig. 2) to MANUAL OFF  
(OUT) position for 15 seconds, then back ON. If  
REMOTE ON/OFF jack is used, unplug for 15 seconds,  
then re-plug with Front Power OFF.  
One or more front panel LED’s glow red.  
The amplifier has been driven into clipping and/or is  
overheating. Correct faulty condition.  
© 2003 Xantech Corporation  
 
Page 14  
Model PA4100X  
SPECIFICATIONS  
Number of channels  
4
Power Output  
100 Watts at 8 Ohms  
Rated continuous power, each channel, all six channels  
simultaneously driven, 20 Hz to 20kHz, at rated THD  
Power Output  
150 Watts at 8 Ohms & at 4 Ohms  
Short term continuous, each channel, 2 channels driven,  
1 kHz, at rated THD  
Rated THD  
< 0.08%  
> 100  
Damping Factor  
at 50 Hz, half rated power  
S/N Ratio  
> 100 dB  
A-weighted, shorted inputs, ref to rated power  
Frequency Response  
12 Hz to 55 kHz  
at 1 Watt, 3dB  
Input Sensitivity  
Max: 0.2 V  
Default: 1.0 V  
Minimum: 3V  
at rated power, stereo mode, input gain  
Input Impedance  
Power Source  
Local Inputs: 22 kOhms  
Common Audio Buss Inputs: 70kOhms  
120 VAC, 60 Hz  
TMRA 35° Celsius (95° F). If this temperature is exceeded,  
you will need to provide additional ventilation to ensure proper  
operation.  
240 VAC, 50 Hz (European version)  
Power Consumption  
No signal: 30 Watts  
Standby Mode: 5 Watts  
4 Channels at rated power: 1050 Watts  
Remote On/Off/Mute CI1 & CI2 Voltage/Current  
Line Fuse Rating  
+5 V to +30 VDC (11mA at +12 VDC)  
120V version: 10A Slow Blow 250 VAC  
240V version: 5A Time-Lag 250 VAC  
Dimensions  
Weight  
17” W x 6” H x 12.5” D  
(432 mm W x 152.4 mm H x 317.5 mm D)  
35.4 lbs (16.1 Kg)  
© 2003 Xantech Corporation  
 
Model PA4100X  
Page 15  
© 2003 Xantech Corporation  
 
Page 16  
Model PA4100X  
XANTECH CORPORATION  
12950 Bradley Avenue, Sylmar CA 91342-3829  
phone 818.362.0353 • fax 818.362.9506  
Part No. 08901195 Rev B 04-03-2003  
© 2003 Xantech Corporation  
 

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