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The RAT1 is an infrared remote controlled stereo
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
Receiver or keypad or with Xantech MIRV1 motorized
volume controls. The RAT1 maintains correct imped-
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.
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 E
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).
INSTALLATION INSTRUCTIONS
RAT1
REMOTE AUTO TRANSFORMER
2
PROM can be set to different group codes for independent
RAT1
REMOTE AUTO TRANSFORMER
AMPLIFIER
INPUT
L+ L– R– R+
STATUS POWER
12VDC
Fig. 1 The RAT1
SPEAKER
OUTPUT
L+ L– R– R+
1
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Summary of Contents for Xantech RAT 1
- Page 1 INSTALLATION INSTRUCTIONS REMOTE AUTO TRANSFORMER The RAT1 is an infrared remote controlled stereo 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.
- Page 2 RC68 PROGRAMMER / REMOTE CONTROL The RC68+ (and the RC68) programmer (available separately) contains all the commands necessary to operate the RAT1. • You will need it to program universal learning devices such as the Xantech URC-1 learning remote, the Xantech Smart Pads, the 590 Programmable Controller, the 710 Fone Link, etc., with commands that operate the RAT1.
- Page 3 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. Remove the two screws for access. The proper placement of these jumpers depends on the number of RAT1's and speakers used in the total installation.
- Page 4 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.
- Page 5 6. Multiply 1.14 by 8 (for the S8 setting) = 9.12 Ohms. 7. Next, calculate the overall paralleled impedance Z example, the calculation is as follows: = 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.
- Page 6 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.).
- Page 7 MAIN ROOM, EQUIPMENT AREA, ETC. 786-00 "STATUS" power supply. Plug into a SWITCHED AC Outlet on A/V Receiver (see text). 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.
- Page 8 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.
- Page 9 MAIN ROOM, EQUIPMENT AREA, ETC. 786-00 AC Outlet on A/V Receiver (see text). 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.
- Page 10 793-10 Serial Combiner "Daisy-Chain" connection. Use To IR IN To IR IN 3.5/3.5mm Mini- and GND and GND Plug cable, on each RAT1 on each RAT1 Pt. # 6017400 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...