Logic 3 Stereo Amplifier RAT 1 User Manual

INSTALLATION INSTRUCTIONS  
RAT1  
REMOTE AUTO TRANSFORMER  
The RAT1 is an infrared remote controlled stereo  
RAT1  
speaker volume control with impedance matching  
capability. It allows individual volume control of from  
one to 16 pair of stereo speakers from one stereo  
power amplifier, using one RAT1 for each stereo  
speaker pair. It is controlled with any Xantech IR  
ReceiverorkeypadorwithXantechMIRV1motorized  
volumecontrols. TheRAT1maintainscorrectimped-  
ance matching between the amplifier and the speak-  
ers with the use of instant setting S1 to S8 jumpers,  
located on the unit. This eliminates the need for  
separate impedance matching devices in multi-room  
installations.  
REMOTE AUTO TRANSFORMER  
SPEAKER  
OUTPUT  
AMPLIFIER  
INPUT  
STATUS POWER  
12VDC  
L+ L– R– R+  
L+ L– R– R+  
Fig. 1 The RAT1  
FEATURES AND SPECIFICATIONS  
• 10-position relay driven stepped auto transformer design.  
• Tri-Fi™ winding system for highest quality audio performance.  
• Amplifier Input: 4-screw plug-in connector.  
• Speaker Output: 4-screw plug-in connector.  
• IR, STATUS & +12V: 4-screw plug-in connector.  
• STATUS Input Jack: 2.1mm coaxial type.  
• POWER Input Jack (+12V): 2.1mm coaxial type.  
• Power Consumption: 300 mA @ +12V DC. Use Xantech Model 786-00 or 782-00 Power Supply.  
• Requires IR commands from the RC68+ (or RC68) Programmer or from the MIRV1, for volume  
operations.  
• Using the RC68+ Programmer, internal E2 PROM can be set to different group codes for independent  
operation of RAT1's when on a common IR bus.  
• Factory preset Group Code number is 30.  
• Independent grounds between channels.  
• 75 watts per channel music power, 25 watts per channel continuous.  
• Frequency response: 20 Hz - 20,000 Hz 1 dB at 1 Watt power input.  
• Attenuation: 10 steps at 3 to 6 dB per step, 35 dB maximum.  
• Impedance Multiplier Settings: S1, S2, S4, & S8.  
• Plug-in connectors accept wire sizes from 24 to 12 gauge.  
• "Flat Pack" design permits easy mounting.  
• Dimensions: 8" x 4-1/8" x 2-5/8" (203mm x 105mm x 67mm).  
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SETTING THE IMPEDANCE MATCHING JUMPERS  
The impedance matching jumpers are located under a clear mylar cover on the right side of the top of the  
unit. Removethetwoscrewsforaccess. Theproperplacementofthesejumpersdependsonthenumber  
of RAT1's and speakers used in the total installation. To set them for the best impedance matching  
condition, refer to the following charts and procedures:  
WHEN USING 8 OHM SPEAKERS  
Number of Speaker Pairs Used  
10 11 12 13 14 15 16  
Min. Amp.  
Impedance  
1
2
3
4
5
6
7
8
9
S1 S1 S2 S2 S4 S4 S4 S4 S8 S8 S8 S8 S8 S8 S8 S8  
S1 S2 S4 S4 S8 S8 S8 S8  
4 Ohms  
8 Ohms  
WHEN USING 4 OHM SPEAKERS  
Number of Speaker Pairs Used  
Min. Amp.  
Impedance  
1
2
3
4
5
6
7
8
S1 S2 S4 S4 S8 S8 S8 S8  
S2 S4 S8 S8  
4 Ohms  
8 Ohms  
Procedure for all 4 Ohm or all 8 Ohm Speakers  
1. Determine the rated speaker impedance (refer to the manufacturer's specifications - it must be the  
same for all speakers used in the system).  
2. Determine the total number of stereo speaker pairs used in the installation.  
3. Determine the minimum safe amplifier operating load impedance (refer to the manufacturer's  
specifications).  
4. Find the correct jumper position from the above charts.  
5. Place the jumpers in the same position on each RAT1 used in the system.  
Example 1:  
13 pairs of 8 Ohm wall speakers are to be used with 13 RAT1's in a 13 room system, all driven by one  
amplifier rated for 4 Ohms minimum safe operating load impedance.  
1. Refer to the chart "WHEN USING 8 OHM SPEAKERS".  
2. Locate the number 13 in the top row.  
3. On the next row, opposite "4 OHMS" and just below "13", note the letters "S8". These signify the  
required impedance multiplier.  
4. The two jumpers therefore, one for each channel, need to be plugged onto the S8 pins on each RAT1  
that feeds each room.  
Example 2:  
3 pairs of 4 Ohm wall speakers are to be used with 3 RAT1's in a 3 room system, all driven by one amplifier  
rated for 8 Ohms minimum safe operating load impedance.  
1. Refer to the chart "WHEN USING 4 OHM SPEAKERS".  
2. Locate the number 3 in the top row.  
3. On the third row, opposite "8 OHMS" and just below "3", note the letters "S8". These signify the  
required impedance multiplier.  
4. The two jumpers therefore, one for each channel, need to be plugged onto the S8 pins on each RAT1  
that feeds each room.  
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RAT1  
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Procedure for Speakers Other Than 4 or 8 Ohms  
In this case, treat all speakers that are rated between 4 and 7 Ohms as 4 Ohm speakers, and use the charts  
accordingly. Similiarly, all speakers that are rated 8 Ohms or higher, treat as 8 Ohms speakers. Again, all  
speakers used in the system should be the same impedance (i.e. all 6 Ohms, all 7 Ohms, etc.).  
Speaker Wire Recommendations  
As a rule of thumb, use good quality 18 gauge speaker wire for runs up to 30', 16 gauge up to 70', and 14  
gauge up to 150'. The 4-terminal connectors accept wire sizes up to 12 gauge max.  
Procedure for Speakers of Differing Impedance Used in the Same System  
You may run into installations where you need to combine speakers of different impedance in the same  
system (8, 6, 4 Ohms, etc.). This is a more complicated situation that requires some calculation to obtain  
optimum results. You need to find the paralleled impedance for each group of speakers with the same  
impedance first and pick an "S" setting for each. Then check the overall paralleled "S" settings to see that  
the impedance is higher than the minimum safe value specified for the amplifier.  
Example 1:  
2 pairs of 4 Ohm and 7 pairs of 8 Ohm wall speakers are to be used with 9 RAT1's in a 9 room system, all  
driven by one amplifier rated for 4 Ohms minimum safe operating load impedance.  
1. Calculate the total paralleled impedance of the 4 Ohm group first, by dividing 4 Ohms by 2.  
4 ÷ 2 = 2 Ohms.  
2. Multiply 2 by 4 (for the S4 setting) = 8 Ohms.  
3. Calculate the total paralleled impedance of the 8 Ohm group next, by dividing 8 Ohms by 7.  
8 ÷ 7 = 1.14 Ohms.  
4. Multiply 1.14 by 8 (for the S8 setting) = 9.12 Ohms.  
5. Next, calculate the overall paralleled impedance with the following formulae:  
ZO = 1 ÷ [(1÷Z1) + (1÷Z2) + (1÷ZN...etc.)]  
ZO = overall paralleled impedance  
Z1 = 1st paralleled group after S setting  
Z2 = 2nd paralleled group after S setting  
ZN = additional paralleled groups, when used  
Since only two paralleled groups are used in this example, the calculation is as follows:  
ZO = 1 ÷ [(1÷8) + (1÷9.12)] = 4.26 Ohms.  
Since this yields more than 4 Ohms, the S4 setting for the 4 Ohm group and the S8 setting for the  
8 Ohm group are the correct ones to use.  
Example 2:  
2 pairs of 4 Ohm, 3 pairs of 6 Ohm and 7 pairs of 8 Ohm wall speakers are to be used with 12 RAT1's in  
a 12 room system, all driven by one amplifier rated for 4 Ohms minimum safe operating load impedance.  
1. Calculate the total paralleled impedance of the 4 Ohm group first, by dividing 4 Ohms by 2.  
4 ÷ 2 = 2 Ohms.  
2. Multiply 2 by 8 (for the S8 setting) = 16 Ohms.  
3. Calculate the total paralleled impedance of the 6 Ohm group next, by dividing 6 Ohms by 3.  
6 ÷ 3 = 2 Ohms.  
4. Multiply 2 by 8 (for the S8 setting) = 16 Ohms.  
5. Calculate the total paralleled impedance of the 8 Ohm group next, by dividing 8 Ohms by 7.  
8 ÷ 7 = 1.14 Ohms.  
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RAT1  
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6. Multiply 1.14 by 8 (for the S8 setting) = 9.12 Ohms.  
7. Next, calculate the overall paralleled impedance ZO. Since three paralleled groups are used in this  
example, the calculation is as follows:  
ZO = 1 ÷ [(1÷16) + (1÷16) + (1÷9.12)] = 4.26 Ohms.  
Since this yields more than 4 Ohms, the S8 setting for the 4 Ohm group, the S8 setting for the 6  
Ohm group and the S8 setting for the 8 Ohm group are the correct ones to use.  
Impedance Setting Tips  
1. You may use the above method to calculate the correct impedance matching condition for practically  
any combination of speakers and RAT1s.  
2. Use the lowest "S" setting possible consistent with the requirement to keep above the minimum safe  
operating load impedance for the amplifier. You may have to try 2 or 3 values of "S" for each  
impedance group and recalculate the overall paralleled impedance ZO each time, before you arrive  
at the final correct value.  
3. When you test the system, you may find volume differences between the impedance groups when all  
RAT1s are set to max. volume. This is normal and is usually not a problem, since the user will be  
listening at lower levels most of the time. If you feel it necessary to even out the volume levels, move  
the "S" jumpers to the next higher number on the RAT1s that feed the loudest group.  
NOTE: While speakers of differing impedance can be accommodated using these procedures, it is  
highly recommended you not do so on a regular basis. The easiest and best performing installation  
is achieved by using speakers of the same impedance throughout the entire system. Then use the  
charts to determine the correct jumper "S" settings.  
INSTALLATION – COMMON IR BUS SYSTEM  
Fig. 3 illustrates a typical installation using three RAT1's along with other Xantech products in a 4-room  
multi-room system. The principles shown should be used as a guide when planning your own specific  
installations. It is configured as follows:  
1. For simplicity, only three RAT1's are shown. Larger systems (up to a max. of 16 using 8-Ohm  
speakers) may be used. 16 is the maximum number using 8-Ohm speakers and an amplifier with a  
minimum loading impedance of 4 Ohms. See chart, in: Setting the Impedance Matching Jumpers  
section).  
2. Note that a Common IR Bus connects the 780-80 "J" Box IR Receiver, the two MIRV1 Volume  
Controls, a 480-00 "Dinky Link" IR Receiver and a Smart Pad3 keypad to each of the RAT1's. In  
addition, it connects to a 789-44 Connecting Block, so that the source equipment can be controlled  
from the remote rooms.  
3. Since a common IR bus is used, each of the RAT1's and its connected MIRV1 (where used) must use  
adifferentIRCodeGroupnumber, sothatthevolumelevelineachroomcanbeadjustedindependent  
of the others.  
To make code group changes, refer to the RC68+ Programmer Instructions.  
NOTE: When shipped from the factory, the RAT1 and MIRV1 are set to code group number 30.  
If you use group 30 or change to a different number, be sure to always set the RC68+ to the  
same number.  
4. When a code group is chosen, "teach" volume commands from the RC68+ Programmer (see Fig. 2)  
into learning remote controls (and the keypad), dedicated to each room. You may use the Xantech  
URC learning remote controllers for this purpose.  
NOTE: With a Common IR Bus system, you cannot carry the same remote control from room-  
to-room. You must use a dedicated remote for each room into which you have "taught" the  
specific RC68+ Code Group that operates the specific RAT1 that controls the volume for that  
room!  
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RAT1  
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If you wish to carry remotes that have the same codes from room-to-room, use a Dedicated IR Bus  
System as shown in Fig. 4.  
5. A 490-30 "Micro Link" IR Receiver plugs into the 789-44 for local control of the source equipment (i.e.  
equipment behind closed doors, etc.).  
6. A "STATUS" system is included. This permits the power "ON/OFF" status of the A/V receiver or  
amplifier system to be visible in each of the remote rooms. It also permits the power management  
capability of the Smart Pad3 to operate.  
7. The "STATUS" indicator LEDs on the 780-80 "J" Box IR Receiver, the two MIRV1 Volume Controls  
and the Smart Pad3, are powered by a 786-00 Power Supply plugged into a "SWITCHED" AC outlet  
on the A/V receiver or amplifier system. When the switched outlet is "ON", +12 Volts from the  
786-00 passes through one of the 4 bus-conductors (STATUS line) to the LED indicators.  
NOTE: A resistor can be placed in series with the STATUS terminal at each IR receiver (IR receivers  
only, if so equipped) for adjustment of the brightness of the Status LED. See the specific installation  
instructions for the IR receiver for details.  
NOTE: When connecting system devices, be sure to carefully match up the terminals according to  
their markings as follows:  
IR IN (IR), STATUS (ST), GND (G) and +12VDC (V).  
Power Supply Considerations  
Up to 3 RAT1's plus associated MIRV1's and IR components can be used with one 782-00 Power Supply.  
(e.g. 9 RAT1's with associated components would require 3 of the 782-00 Power Supplies). Typical power  
supply connections are shown in Figs. 3, 4 and 6.  
6
RAT1  
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MAIN ROOM, EQUIPMENT AREA, ETC.  
786-00 "STATUS" power supply. Plug into a SWITCHED  
CONTROLLED COMPONENTS  
490-30  
"Micro Link"  
IR Receiver  
AC Outlet on A/V Receiver (see text).  
Satellite Receiver  
(i.e. cabinet mounted for  
IR control in main room)  
CAUTION: Stereo receivers usually have two sets of speaker terminals, "A"  
and "B". Be sure all speakers connected to both "A" and "B" are taken into  
consideration when paralleling speakers, so that the amplifiers are not loaded  
by an impedance that is lower than that specified by the manufacturer.  
283M Blink-IR™  
SPEAKER TERMINALS  
A/V RECEIVER,  
L
R
+
-
-
+
AMPLIFIER, ETC.  
CD Changer  
(Back Panel)  
789-44  
Connecting Block  
782-00  
Power Supply  
283M Blink-IR™  
(Place on FRONT  
Panel IR Sensor)  
+12 VDC  
283M Blink-IR™  
GND  
STATUS  
IR IN  
Mouse Emitter  
To 120 V AC  
(unswitched)  
RAT1 #1  
RAT1  
RAT1 #2  
REMOTE AUTO TRANSFORMER  
RT1  
REOTE AUTO TRANSFORMER  
SPEAKER  
OUTPUT  
AMPLIFIER  
INPUT  
TATUS POWER  
12VDC  
L+ L– R– R+  
L+L– R– R+  
RAT1 #3  
RAT1  
REMOTE AUTO TRANSFORMER  
SPEAKER  
OUTPUT  
AMPLIFIER  
INPUT  
STATUS POWER  
12VDC  
L+ L– R– R+  
L+L– R– R+  
SPEAKER  
OUTPUT  
AMPLIFIER  
INPUT  
STATUS POWER  
12VDC  
L+ L– R– R+  
L+L– R– R+  
R
R
R
L
L
L
+
+
+
+
+
+
IR  
V
ST G  
XANTECH  
IR  
V
ST  
480-00  
"Dinky Link"  
IR Receiver  
G
IR ST  
G
V
S-62/64/66  
780-80  
"J" Box  
IR Receiver  
MIRV1  
MIRV1  
Wall Speakers  
Smart  
Pad3™  
Volume  
Control  
Volume  
Control  
ROOM 2  
ROOM 3  
ROOM 4  
Fig. 3 A RAT1 System Using a Common IR Bus  
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RAT1  
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INSTALLATION – DEDICATED IR BUS SYSTEM  
Fig. 4 illustrates an installation where each remote room has a Dedicated IR Bus going to the RAT1 that  
controls it. The IR bus is not connected in common as it is in Fig. 3. This eliminates the need for dedicated  
remotes, allowing you to carry the same remote(s) from room-to-room. It is configured as follows:  
1. Again, forsimplicity, onlythreeRAT1'sareshown. Largersystemsmaybeconfigured, usingthesame  
connectiontechniques(uptoamax.of16RAT1's). 16isthemaximumnumberusing8-Ohmspeakers  
and an amplifier with a minimum loading impedance of 4 Ohms. See chart on page 3.  
2. Each Dedicated IR Bus connects the 780-80 "J" Box IR Receiver, the two MIRV1 Volume Controls,  
a 480-00 "Dinky Link" IR Receiver and a Smart Pad3 keypad to their respective RAT1's.  
3. In order to control the common source components in a Dedicated IR Bus system, it is necessary to  
use a 793-00 Serial Control Combiner, connected as shown in Figs. 4 & 5. The 793 provides diode  
isolation between the IR signal lines but allows common operation of the source equipment through  
the 789-44 Connecting Block, as shown.  
Set the LOGIC POLARITY SELECTOR DIP switches on the 793 for "active high" operation - that is  
- all even numbered switches to "ON" - all odd numbered switches to "OFF".  
4. The input and output ports on the 793 are 3.5mm mono mini jacks. Use matching mini plug cables  
with stripped ends when connecting. Polarity must be observed as shown in Fig. 5.  
For systems using more than five RAT1's, you will need additional 793-00's. These can be easily  
"daisy chained" as shown in Fig. 5.  
5. SinceaDedicatedIRBussystemisused,eachoftheRAT1's(andMIRV1's)canoperatewiththesame  
IR Code Group number. In this case, the Code Group number, as received from the factory, should  
be used.  
NOTE: When shipped from the factory, the RAT1 (and MIRV1's) are set to Code Group number  
30. Be sure to set the RC68+ to the same number!  
If a particular system requires a code group number change, refer to the RC68+ Programmer  
Instructions for code group setting procedures.  
6. The desired volume commands from the RC68+ Programmer (see Fig. 2) need to be "taught" into  
learning remote controls and keypads used in the system. You may use the Xantech URC learning  
remote controllers for this purpose.  
7. A 490-30 "Micro Link" IR Receiver plugs into the 789-44 for local control of the source equipment.  
8. As in Fig. 3, a "STATUS" system is included.  
NOTE:Whenconnectingsystemdevices,besuretocarefullymatchuptheterminalsaccordingtotheir  
markings as follows:  
IR IN (IR), STATUS (ST), GND (G) and +12VDC (V).  
Daisy-Chaining 793-00 Serial Control Combiners for Control of Common Components  
Fig.5 illustrateshowtwo793-00SerialControlCombinersare"Daisy-Chained"toaccommodateadditional  
RAT's in a dedicated IR Bus System. This process can be repeated as necessary to accommodate the  
number of RAT's needed in the system. Simply connect the "B" CONTROL OUTPUTS port of the next 793  
into the "A" CONTROL OUTPUTS port on the preceding 793 with a 3.5-to-3.5mm mono-mini cable as  
shown.  
NOTE: Be sure that all ten LOGIC POLARITY SELECTOR DIP switches on each 793 are set correctly. In  
this case, set them for "active high" operation - that is - all even numbered switches to "ON" - all odd  
numbered switches to "OFF".  
8
RAT1  
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MAIN ROOM, EQUIPMENT AREA, ETC.  
490-30  
"Micro Link"  
IR Receiver  
CONTROLLED  
COMPONENTS  
786-00 "STATUS" power supply. Plug into a SWITCHED  
AC Outlet on A/V Receiver (see text).  
(i.e. cabinet mounted  
for IR control  
Satellite Receiver  
CAUTION: Stereo receivers usually have two sets of speaker terminals, "A"  
793-10  
and "B". Be sure all speakers connected to both "A" and "B" are taken into  
consideration when paralleling speakers, so that the amplifiers are not loaded  
by an impedance that is lower than that specified by the manufacturer.  
Serial Combiner  
in main room)  
SPEAKER TERMINALS  
283-00 Emitter  
A/V RECEIVER,  
AMPLIFIER, ETC.  
(Back Panel)  
L
R
+
-
-
+
CD Changer  
789-44  
Connecting Block  
283M Blink-IR™  
(Place on FRONT  
Panel IR Sensor)  
+12 VDC  
283M Blink-IR™  
GND  
782-00  
Mouse Emitter  
STATUS  
IR IN  
Power Supply  
To 120 V AC  
(unswitched)  
RAT1 #1  
RAT1 #2  
E AUTO TRANSFORMER  
RT1  
REOTE AUTO TRANSFORMER  
SPEAKER  
OUTPUT  
AMPLIFIER  
INPUT  
POWER  
12VDC  
L+ L– R– R+  
L+L– R– R+  
RAT1 #3  
RAT1  
REMOTE AUTO TRANSFORMER  
SPEAKER  
OUTPUT  
AMPLIFIER  
INPUT  
STATUS POWER  
12VDC  
L+ L– R– R+  
L+L– R– R+  
SPEAKER  
OUTPUT  
AMPLIFIER  
INPUT  
STATUS POWER  
12VDC  
L+ L– R– R+  
L+L– R– R+  
R
R
R
L
L
L
+
+
+
+
+
+
IR  
V
ST G  
XANTECH  
IR  
V
ST  
G
480-00  
"Dinky Link"  
IR Receiver  
IR  
ST  
G
V
S-62/64/66  
780-80  
MIRV1  
MIRV1  
Wall Speakers  
Smart  
Pad3™  
"J" Box  
Volume  
Control  
Volume  
Control  
IR Receiver  
ROOM 2  
ROOM 3  
ROOM 4  
Fig. 4 A RAT1 Dedicated IR Bus System  
9
RAT1  
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INSTALLATION (cont'd)  
CONTROLLED  
COMPONENTS  
793-10  
793-10  
Serial Combiner  
Serial Combiner  
Satellite Receiver  
283M  
Blink-IR™  
CD Changer  
789-44  
Connecting Block  
283M Blink-IR™  
Mouse Emitter  
+12 VDC  
GND  
+
STATUS  
IR IN  
To additional  
Emitters if  
needed  
"Daisy-Chain"  
connection. Use  
3.5/3.5mm Mini-  
Plug cable,  
Use Mini-Plug-  
to-Stripped  
White  
Stripped  
Side (+)  
To IR IN  
To IR IN  
and GND  
on each RAT1  
and GND  
end cables,  
on each RAT1  
Pt. # 6017400  
Pt. # 6015900  
Fig. 5 Daisy-Chaining 793-00's in Multiple RAT1 Dedicated IR Bus Systems  
Driving Multiple Speakers From a Single RAT1  
In some cases you may need to  
drive more than one set of speakers  
from a single RAT1, such as in large  
rooms or adjoining areas where  
common volume operation is  
acceptable. A typical system is  
shown in Fig. 6.  
RAT1  
REMOTE AUTO TRANSFORMER  
FROM AMPLIFIER  
SPEAKER TERMINALS  
SPEAKER  
OUTPUT  
AMPLIFIER  
INPUT  
STATUS POWER  
12VDC  
L+ L– R– R+  
L+L– R– R+  
1. Use the same charts and rules for  
setting the impedance jumpers.  
In Fig. 6, all 8-Ohm speakers and  
an amplifier capable of handling  
an impedance of 4-Ohms, is  
assumed; resulting in a jumper  
setting of S1.  
782-00  
Power Supply  
To 120 VAC  
(unswitched)  
786-00  
Status Power  
Supply  
R
R
L
L
+
+
+
+
IR  
V
ST  
G
2. Note that two MIRV1's are used;  
one at one location in the room  
and the 2nd in another, for  
convenience of use. They both  
controlthesamevolumeleveland  
track each other.  
IR  
V
ST  
G
MIRV1  
780-80  
MIRV1  
"J" Box  
IR Receiver  
Volume  
Control  
Volume  
Control  
LARGE ROOM OR AREA  
Fig. 6 Driving Two Speaker Pairs From One RAT1  
12-8-00  
Rev.C  
10  
RAT1  
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